Panasonic TV very washed out picture repair
ฝัง
- เผยแพร่เมื่อ 15 ก.ย. 2024
- Screen capacitor failure on a PAanasonic TV, but the same applies to all CRT tvs and computer monitors. they all have a screen capacitor and the symptom is the same for all of them.
![HIWWHEE | OHM [Official MV]](http://i.ytimg.com/vi/OJJLtTLqLag/mqdefault.jpg)
Lot of these Sony & Panasonic box tvs we had in 2000, I wish we had you fix em up so badly😭 but they’re totally junked & scraped now for 10 years now. I really love these old Tv sets.
Finally, a video that shows how to fix the exact issue I'm having with my Samsung HD CRT. Widescreen HD CRTs are harder than hell to find anymore and I was really hoping mine wasn't dead. You're a lifesaver!
Yes I know. I had a nice 34 hd wide screen. I gave it to my father in-law and when it broke rather than break their back to bring it over they tossed it for a cheap lcd that lasted 3 years and then another LCD.
Thank you very much for sharing I used to work on these older CRT sets and I find it fascinating. Really excellent
walker55able
did you hear about the guys in Ontario working at the recycle cener that opened up an old TV and found 100,000.00 in cash inside? they won the lottery and gave it back. owner was located and his hidden cash returned.
What a wonderful example of honesty and integrity eh giving the money back? I also enjoyed watching your light bulb technique was wondering how you used your oscilloscope and variac.
There was another example out here west a few months ago. A cab driver at the end of his shift found a package that had slid under the seat that had 300,000 in cash in it. As it turned out the 300 grand was his inheritance. He dropped it in the cab, and didn't notice it missing until he got home and the cab was long gone. The cabbie picked up several more fares during the day, and nobody found the envelope.
The cab driver did the right thing and tracked down the man and returned the cash. The man gave him a reward for returning the cash.
Now, given the size of the reward the cab driver probably wishes he didn't say a thing and kept the cash. You might wonder what the reward was? It was all over the news, and had local DJ's poking fun at it. He gave the cab driver 50 bucks. Yup, you heard correct, return 300 grand and he gives him 50 bucks. Had that been me and I lost 300 grand in a cab, and the driver returned it, I would have given him a heck of a lot more than that. No word yet on if the guys at the recycle center got anything for the 100 grand they returned, but that story just broke 2 days ago, so perhaps there will be a follow up on that one.
Hi again 12voltvids Yes wonderful honesty by the cab driver. Really enjoying your fixes here in the UK. The last ones i watched (Samsung Plamsa TV 50 inch) shows you using the Scope and forcing the power supply to work using the Resistors. Kinda wish I was working with you as I have rediscovered electronic repair recently after a good time away.
I totally agree with you on fixing things! This whole syndrome of OH ITS GOT A SCRATCH THAT YOU WILL NEVER SEE! Chuck it into landfill anyway! I have a brand new Technics SL1200 MK2 Turntable fitted with an Ortofon cartridge. Yes there are better Technics turntables available today but I like my 1200. It's running into a Primaluna Dialogue Premium HP Integrated Tube Amplifier and a pair of Wharfedale speakers and it sounds wonderful and the turntable is quiet! It also reminds of my DJ days everytime I use it. The waste we humans produce is criminal!
The transistor is shorted. I checked and found the highest resistance to be 0.3 ohms. As mentioned earlier, I had checked caps and diodes in the power section and they all checked good. I did replace a 220uf cap because the outside wrapping had really shrunk around the cap. I'm sure this shorted transistor is the problem. All I gotta do now is find one similar. Once again...thank you so much. I will let you know what happens when I get it replaced.
+Larry L Check the connections on the pins of the drive transformer. What usually happens is a cracked connection causes arcing around the pins and the resulting noise kills the transistor. Also beware of counterfeit transistors. They look identical and will fail within hours. I don't know how big this problem is today but 15 years ago the counterfeits were so prevalent in the marketplace, that if you didn't buy direct from the manufacture parts dept, there was an excellent chance that you were getting a fake.
Love to see CRTs get repaired, especially in such a casual manner. Very fun to watch.
Nice one! It's amazing how many issues can be traced back to bad caps. I've had quite a few, and I have learned to not overlook those guys. The best are the ones that look a-ok, but have 1/100th the value.
Another excellent repair , thank you..
I’m all for fixing these. They don’t make them anymore.. I like having a hd flatscreen too but I’ve always loved crt TVs. Their well built.
well you helped me just solve a problem on a 20 " pvm thank you
Can't beat old timers, no offense meant, but i am a machinist and you learn more from guys like you then anywhere else
+Phill Stevenson I learned from an old military radio engineer way back in the early 80's. He taught me everything he knew before retiring. I used that knowledge for a 20 year career in the electronics business before moving on to follw my family legacy, working for a big telecom. My mother's brother had a 38 year career in telecom as a plant welter, my mothers sister's oldest daughter worked as an operator, and now it is my turn to serve my time as a field technician. I am trying to get my kids, both late teens interested in trades, but unfortunately they have no interest at this time. They touch a screen and if it doesn't work they panic like the world if coming to an end. More young people need to take an interest in trades, as once the experts and journey persons are done, there will be no one left to hand down that knowledge to. I work with a guy that is working in the warehouse while going to school studying history! What good is a history degree when it is all said and done. With a trade, he could go anywhere, and he is figuring that out now, half way through his masters, and dealing with engineers and technical staff all day long. Have a trade, be employed for life.
+12voltvids i hear you there, i have been machining for 8 years, and I have been doing electronics repair, mainly video game consoles. not too good with these types of repairs, my brother repairs and builds tube amps. My Problem is i can look at the schematic and know what the circuit does but don't have the experience with tv's to say oh its giving me this picture i need to check this, but i ll jump in there.
+Phill Stevenson Just going to upload a Toshiba CRT repair tonight that had lines at the top of the picture. Shot it with a tape based camera. Remember those?
+12voltvids yes i do, i collect some old computers got an atari 800, c64k, c64 breadbox, got a nice commodore 1802 monitor that needs a power switch.
@@12voltvids teach me ur ways. I am 14 and although i know about the new tech, this technology is unknown to me and nobody i know also has the knowledge of retro/vintage stuff.
Interesting! I've just picked up a 19" 4.3 tv that I want to take the tube from for my arcade machine and I can see why it was dumped on the road, has the same issue, the tube is absolutely fine and just what I need but interested in seeing if I have a cap thats gone and replace it, will save the chassis as it may come in handy.
These are actually very good televisions
@@maxfactor4209 oled.? Don’t make me laugh, let’s see if your oled lasts 40 years.
Mate id rather have this set than any LCD piece of junk, nothing beats Phosphor for good colour, yep youre right, lead free solder is absolutely crap, but leaded has serious risks involved
I open up my tv.. hardly any caps on the new ones.. only 4 or 5 caps .. all looked good.. So i bought a new tv
Thanks! Got my garage tv going again.
I have this issue with two Sony PVM-1954Q's. It's not as bad as this set. Only happens with bright areas against a darker background. I did a full recap of the video, power, and neck boards on both and the issue still remains. If I try to turn G2/Screen up or down, no change on the screen in terms of brightness. I verified power is at 115.0v under load. Since I'm feeding RGB into it, disconnecting green makes the issue go away on both monitors. Turning the gain up or down for green doesn't do anything either. Other than this one issue, both monitors look fantastic. What else can I look at?
CRT
That's good to know. Physically the flyback looks ok, didn't see any cracks around driver transformer. I'm going to check a few more components; ordered the transistor....its not easy to find.
Thank you 12voltvids for your response.....didn't expect it to be so quick. BTW....no picture....just a black screen with a high pitch frequency tone. The TV just hit 20 years old and its been great....I hate to give it up if I don't have to. I'll try your suggestion....thanks again for your time and response....that's very kind of you!
+Larry L Does it have a separate switching power supply (inverter type)?The set features in this video does. That is the small transformer in the middle of the board with the copper foil tape wrapped around it.Panasonic made TVs with both switching type power supplies and conventional linear. If so the squealing is likely the power supply trying to produce power, but there is a short somewhere in the secondary. Check the horizontal output transistor for short. You can remove it, and see if the 160v B+ supply comes back (and the squealing stops) If the horizontal output is not shorted, you will need to check the diodes in the secondary of the power supply circuit for shorts.The fact that you hear a high pitched squeal indicated that the oscillator and output for the power supply is running, If the output transistor is OK and there are no apparent shorts on any of the various outputs from the switching transformer, try disconnecting the B+ input from the flyback. If the horizontal output is shorted it could be from one of a few things. It could be a shorted flyback, that caused it, or loss of horizontal drive usually caused by cracked solder on the horizontal drive transformer.We have an old 28" Panasonic CRT TV at work in the lunch room that is broken. I took in my old DLP and stuck the old one under the counter. I should drag it home and do a service video on it for fun. If it wasn't so bloody heavy I would have already done that.
This video was posted 9 years ago... That should be 2015. So why would people want an "old" TV to be restored? Because probably they don't watch TV :) If I would follow a TV show (twice a year max) I turn on my 1963 TV set which I keep in mint condition, 23 tubes Rafena B&W set. I usually watch music shows and the TV has an amazing sound - 3 speakers in a massive wooden box. Would I buy something new to watch TV? Definitely no.
This was a nice and informative repair.
People want old CRT TV's to play old game consoles on. I have a few i hang onto for nostalgia. Mostly small sets and unique pieces. I have a 1.5" color CRT a 2" b/w flat tube, a few 4.5" b/w and a few 5" color, an 8" Trinitron a few 13" sets and tv/VCR combo a couple of 19-21" sets and a 27" tv/VCR/DVD combo. I don't watch them but i do watch my 63 plasma set regularly.
Interesting, I have a CT-27SF37B from 2001 that appears to be the *exact* same set but isn't labeled on the face as belonging to Panny's upper tier "GAOO" CRT line (seen @13:05). This set, or at least my model, has some crappy picture processing that can be turned off in the service menu for a better picture. Also has Velocity Scan Modulation that can be disabled by disconnecting a pair of wires that run off the tube to the main board (a jack labeled "C2"). Calibrated this TV really has fantastic picture quality for what it is. Thanks for the video!
+sehnzeleid The same set was marketed under the Gaoo line, and the only difference was the CRT. The glass on the GAOO line was darker, increasing the contrast (and shortening the life of the tube as it had to be driven harder)Velocity scan modulation, changing the speed of the beam as it scanned slightly to sharpen edges of images, some people thought it improved the picture, others not so much. I used to have a TAU 34" CRT set that recently went to the recycler, despite my protests to fix it because it was the last of the HDCRT sets that was made, and when it was running it had a superb picture easily beating any LCD/LED tv, and even outperforming the plasma that replaced it in most situations. BUt it weighed a bloody ton, and nobody would help me move it, other than to the truck to dispose of it!
Sorry about the long belated reply and thanks!
High definition tape, never knew that was a thing. Looks pretty decent.
How much does it cost to have the caps replaced and possibly rejuvenate the tube?
Not much, all the capacitors would cost no more that £30
please, I wish you make a video about this = I have crt TV that surge out volt from the video input port or the VGA port in a way that if you ground your self and touch the video port or the VGA port will get a small shock, also if the TV on and you want to connect the DVD player to the video port then when the video cable near the TV video port there will be a spark, and once the DVD video connected then the DVD shace will become electrocuted and if you touch the DVD body you will get slight shock also there is some hum in the audio, please I see this commen problem in tvs and pc monitors and it burned many motherboard because of it, I know you can help , and thank you good videos
What you are experiencing is what is called line leakage. Typically there is a very high ohm resistor, in the meg ohm range that ties the chassis to the hot ground (neutral). If your AC plug was reversed, and the hot wire was on the neutral line the hot side would be supplying power to the chassis ground, and you will get a small shock when say handing a grounded catv wire and you touch something metal on the back of the set. This is why polarized plugs are important, as they only allow insertion of the plug the correct way to make sure the neutral is actually the neutral.
I can probably demonstrate this with my old Sony TV and an even older polarized extension cord. Great idea for a video.
12voltvids if you can make more than one video about it and please always draw schematic on paper and show it to the camera , I hope you address this subject from the ground up make video about TV and about pc PSU,. I really h hope you can design counter circuit for this problem , finals please add link to webpages, I hope you start your website and I and links to your video in there, really good videos thanx and keep the good work
Where are the geometry controls on the inside of a CRT? My CRT has some garbage geometry that's driving me nuts.
On this one if you look around the yoke you will see a bunch of small square magnets. These get rotated to change geometry around the tube. There are also little flat magnets inserted between the tube and the yoke, and small magnets attached to the bell of the tube to correct specific areas.
12voltvids I looked on the inside of my Panasonic, and there's no magnets inside. Are there any knobs I can twist or controls I can adjust that will improve the geometry?
In the later CRT models must enter in the service menu through a specific sequence for geometry and other adjustments.
This gives me hope on my JVC TM-h150cg, it got a similar condition. Where do I start to look?
What are the problems of a samsung crt tv with sound but no picture. Thank u.
No high voltage coming out of the flyback
I was told that you have to desolder a capacitor in order to test it
Amazing work!
Happy New Year stay well Leo
So just to be clear, when you’re talking about the screen circuit from the flyback, you’re NOT talking about the G2? And the cap should be somewhere near the connector that goes to the CRT neck board?
Hi, i have a Panasonic tc - 21s1r CRT tv, i have had a problem with it for a while now, it keeps flicking light then black, and when i tap the side of the tv it stops the flicking, i have switched off all nearby plug ins and also this fault is happening with the scart lead out aswell and no other connections attached. I only use it for dvd watching and gaming, but the problem is getting worse and now i get white horizontal lines that go brighter then the tv switches itself off, it seems to be very sensitive to touch and the problem seems to improve after i’ve left it on for a few hours. any help would be appreciated.
siavash arash
Imagine possibility of paralleling another low ESR capacitor when you mesuring a cap which soldered in board
And i sow many and many caps has low esr but licking internaly in high level
I know at least 5 TH-camrs... who will have a heart attack watching you work with that CVR... without discharge the so very dangerous high voltage inside that tube....... I'm sure you know exactly where and where NOT to touch...
hello i have a little problem my CRT TV will not start
this is the PDF for my TV I could use some help
You can send attachments to me at the following email address.
volt@telus.net
Free makes a big difference!!!
+Donald Ellett This one was a paid repair. I think I made 60.00 to fix this set for the owner, and they still watch it. Someone not quite ready to step into the 2000's yet.I shouldn't laugh. I still have a CRT tv. I have a few of them.
12voltvids _Someone's not ready to step into the 2000s yet._
Technically they are. The GAOO was made in May 2000.
my crt tv model f36669 RCA is displaying "undetectable signal" on video. Thats without anything hooked up to it. Its still the same with game consoles are conected like NES, Dreamcast. If you can give any advise i would appreciate it. thanks
Not familiar with this model, but some TVs had a setting in the menu to select between video and Svideo others have an auto detect that will switch to s-video if there is an s-video plug inserted regardless if there is a signal on it or not.
Love your vids!
Sweet job!
Great job 😊
That Cap near the Heatsinks has been bothering me
Hi 12Voltvids I don't know if you can help with my problem, I have a panasonic TX-29ad2dp tv which has a weird problem the picture is good clean and sharp but if you look at an image when say a dvd or games machine is on pause the image is moving, the only way i can describe it is like seeing a flag blowing in the wind or pond ripples which speed up and slow down, also if a white screen is displayed you can see like very faint grey shadowy lines about 3 inches wide the move vertically but quickly up the screen...any ideas? would like to fix this set as I don't want to chuck it out as it's a really nice tv
Jessie4Pink Oh my god no one cares
Clearly you do to comment!
Jessie4Pink I cared only enough to show you reality.
thanks for the video, i subscribed and will go through more vids, a question about the electron gun , what is it made up off and are the components worth anything, thanks again
Nothing valuable in them.
thanks for fast reply, i am on east coast and getting late, so i used to be an electronics tech many years ago and found myself in need of a hobby, happen to see my area fill up with crt's and decided to see if i could recycle or scrap. found most of these tv's actually in good working order, just old and people dumping them, i will salvage some parts for projects and then recycle the rest, thanks again and i look forward to more of your vids, good night and happy healthy new year to you and yours,, j
Vintage gamers want those old CRT sets. I have given away a few to guys that want to play the old vintage games as they find LCD sets too slow on refresh. The people that paid me to fix this set wanted it for an old vintage game console that looked bad on the new TV.
TV's of that era weren't so bad, at least they were serviceable. I wouldn't complain about them. Sadly now it's come down to often replacing boards.
Everything was serviceable back then and many people made a pretty good living repairing it.
I like the lead too. I have soldered since I was a child. I should have died yeas ago. Yes I can relate, often that cap is on the neck board.
Been tinkering with electronics since I was about 7, studied all through school, didn't plan to go into field. Planned to go into TV production. Fell into the service industry as it paid the bills, did it professionally for 22 years, retired from the business and went into a totally different industry, but stayed active in electronics repair. From all the solder smoke, and chemicals I have been exposed to over the years I probably should be dead too. Back in the day nobody used fume extraction.
I never worked at a place with fume extraction. I did one thing. I washed my hands before eating.
Same here. After handling solder (lead) or getting any cleaners or lubricants on my hands, it was a trip to the sink to wash up. Boss used to get mad because he saw the multiple trips to the washroom as wasting his time.
Did you ever use kester ap20 flux remover? Loved the stuff. Dumb boss. Lol
We used MG super wash which was pure TF solvent until they banned it, and yes my boss was something else. What I still to this day haven't figured out.
Bi-Polar comes to mind. It was Jeckyl and Hyde at that place.
i have sony crt 29" KV-AR29 having similar problem , tv works normal on starting but after 5 minutes the right side horizontal side top to bottom picture is slashed of 3 inches as if it cut with knife.i checked HOT transistor and capacitors around all it looks ok .what could be the problem.pl reply thank u
That's good to know about the transistor; I'm going to see if I can still get one from Panasonic. I see about 3 transformers on this board (not including the flyback). Are you talking about cracked solder joints on the drive transformer; also, would the drive transformer be the larger transformer (other than the flyback). Unfortunately, I'm trying to diagnose this without the benefit of a schematic. My Panasonic model # is: CT - 31S18S. I took a picture of the circuit board but I can't figure out how to send it you on YT.
+Larry L
The horizontal transformer is small an the secondary connects to the base pin of the horizontal output transistor and ground.
traduzindo para português brasileiro
eu
Great video! Ever come across a service manual for this unit? Can't seem to find one
No but then I haven't been looking.
Great vid. I swear at 14:45 of the video, I see a cut from editing, and the cap you replaced appears to grow longer??? Did you have to replace the replacement off camera? Lol.
No it was touching the leg of a resistor, so I straightened it up is all.
I HAVE INPUT PROBLEM WITH PANSONC TC 21GX20RS WHENE VIDEO AND SOUND INPUT CONECTED GIVES BLACK SCREEN WITH LITTLE SOUND WHAT IS THE PROBLEM
I'm curious.... what is your favorite brand crt? Sony, Panasonic, JVC?
Conrac and Tektronix. Don't worry if you have never heard of them. They were American broadcast monitors and they had the most beautiful picture I ever saw, given a good signal. VHS looked absolutely horrid on them however because they showed every flaw of the shitty VHS picture. They were video evaluation monitors to show absolute video quality at the highest resolution possible. Trinitron were pretty soft by comparison and masked all the flaws just like airbrushing an unattractive model. You know, a 3 dressed up as a nine.
Sony had some evaluation monitors too, professional fine pitch tubes but these were not generally on consumer TVs. The big problem with Sony is the 2 horizontal wires on the aprature grill. The conrac and tek monitors used delta gun with a extremely fine dot pitch. The gun end of the tube was also huge, about 2" across as opposed to consumer tubes that used a 3/4" gun assy. They also used super high voltage for super fine focus and giving the viwer a good dose of Xrays as an added bonus.
How to Place STR W6754 on Panasonic Model TC 21fX20r PCB.
Just 1 capacitors is all that was bad?? I was always told you have to keep the microfarads the same and could go a little higher in voltage??
+Donald Ellett Yes just the 1 cap in the screen filter circuit is all that was bad on that one. Yes you can go higher in voltage. The capacity you want to keep close to original value, but it depends on what the circuits is. In this case it would be OK to up both the uF and the voltage, as it is not a critical tuned circuit, it is just a filter cap for the power supply.
Good fix
Do you ever discharge the high voltage transformer before you handle these boards??
No, because the diodes in the transformer will block any stored energy in the tube.
@@12voltvids ... That's good to know because my father always did discharge ours and it's one loud zap...I have one of those Toshiba's with a bad cap causing white lines. Maybe I'll get to fixing it. Now I know the which culprit capacitor it is. Thanks!
OK thanks...I Wii check it out. what do think the odds are that the flyback needs replacing?
+Larry L
Panasonic didn't have flyback problems. Sony and RCA, yes.
Not saying it can't happen but they didn't have many problems. Usually it was dry glue around the core which resulted in it squealing.
similar problem i ahve on my sony tv whether screen filter cap is on prime side of fly back or secondary side .pl reply
Same on LG Lafinion
good one, thanks...
Thats a GAOO, theyre one of the best TVs Panasonic ever made, add RGB input to that best and itll be the ultimate retro console gaming set.
The Gaoo and Tau were great sets that Panasonic made. That is the reason the owner of this wanted it fixed. They were not wanting an HD set as they watched many old VHS tapes and we all know how good those work on modern sets.
12voltvids Yes theyre great, i had both the 47" and 51" GAOO rear projection, and still have a 68cm and a 51" Tau GIGA here.
@@CaseTheCorvetteMan
I had a 34" 16x9 HD tube set. Gave it to my father in inlaw and when it broke he threw it out and bought a flat panel that lasted 14 months, and the LEDs failed so he had to buy another one.
Ive got 2x Philips Matchline 16:9 HD sets here too, theyre pretty good sets
this is great im looking something for this.
sir how to repair tv panasonic 21 inches.....crt type.....with sound but no picture..pls reply...thanks
I have a Panasonic 31" CRT tv. It doesn't power on but make a whistling sound. I checked and replaced capacitors and diodes with no luck. Any ideas? Thanks
+Larry L Does it have a picture?If so the likely cause of the whistle is a cracked core on the flyback (HV transformer) The fix for that is really simple. Pour some super glue down the core around the ferrite rod. This will seal the joint in the middle and stop it from squealing. There are also other ferrite inductors in the horizontal deflection that come unglued, and even the deflection yoke has been known to whistle.That was a very common problem with Panasonics.
Is it ok if I replace a 0.22uF 50V with a 1uF 50V because I only found this in a local online store ?
Never mind I already did it & now I have sound again on my old goldstar TV.
picture tubes can store a lot of bbq power .
+YUKI JINJUJI Yes I know from experience.
Lafinion LG has the same problem.
How do you know what caps to buy?
I buy whatever i can get cheap.
i have a red screen tv ho can i fixed it
Hi, i have HD philips 29 inch crt thats good for retro games and when i turn it on it shows picture for about 5 seconds and then turns off and it takes about 4 tries to get it to stay on, when it turns off it flashes error code on the power led and for that model that error code means "vertical guard protection", what should i check first?
Edit: also it has like a foldover lines at top of screen that dissapear after about a minute after it manages to stay on after few tries
Small capacitors in vertical circuit. Tupically it will be a 1 to 10 if. Will generally be right in there next to the vertical ic.
@@12voltvids thank you :)
Your videos are very helpful but man you’re shop is pretty messy
Every good shop I have ever been in looks like this. The reason is we are so busy we don't have time to clean up between jobs. Time is money and when work is piling up there is no free time to put things back. Now the clean shops, well the opposite is true. They have much spare time.
When repairs get slow here I still don't have time to spend cleaning up the shop as my business is very busy and I also work full time at another job. So no, I don't have time to clean up between jobs. I actually wish things would slow down as sometimes there are not enough hours in the day.
damn crt's are built to last
is it cathode supply caps ??????????????
Supply for the video outputs.
what model esr meter is that,i have to buy one ,nice video's
It was a kit. Based on the Dick Smith kit from 30 years ago. They are still readily available, and they work great.
@@12voltvids I know at least 5 TH-camrs... who will have a heart attack watching you work with that CVR... without discharge the so very dangerous high voltage inside that tube....... I'm sure you know exactly where and where NOT to touch...
@@Ramdileo_sys Its not that dangerous. Unless you go about sticking your fingers on the horizontal output or under the HV cap. I spent 20 years in the business and got but a few times including from the 30KV 3nd anode. Youo just have to be careful. Old tube amplifiers and radios far more dangerous to work on. (and tube TVs)
Have you ever dealt with the Panasonic prism sets
Yes. I had one for years.
The prism was one of the first sets that I discovered counterfeit horizontal output transistors with.
I had a prism set come into the shop about 1995 or so. Horizontal output blown. Cost from Panasonic 38.00 dealer cost. Cost from main electronics 5.12. Of course we bought the cheap one, because it was identical right. The first ones were, and never had any problem. Then the fun started. Had another one come in, put in a cheap replacement, and sent it out. 2 weeks later it was back, transistor blown. Put in another one, and it lasted a week, and bam, it came back like a boomerang.
3rd transistor in, and monitor set in shop. Working just fine with back off, beautiful pictire. Ran it for a week all day every day. Left it turned on over night. Seemed fine. Put the back on it, and ran it in the shop with back on. Popped the transistor again. I was pulling my hair out because the set was not drawing excessive current, and the waveform was clean, but the boss was convinced that the flyback was shot and refunded the customer. The set went into the corner. I started running into other "new" transistors that were failing left right and center, and was talking to my colleges at other shops and they too noticed this. This was the start of the counterfeit transistor plague that hit the industry really hard in the mid 90's.
Sure I could have ordered a 38.00 part, but why wants to risk that not knowing what caused the original and 3 replacements to fail. There was talk all around the tech fourms about bad transistors and some had taken it to using a dremel cut open the case. I did that on a dead original and a replacement from an aftermarket supplier. Sure enough the die was about 1/4 the side of the original. No wonder it failed.
It wasn't long after I had a prism come in with a broken tube. Set had fallen over. I pulled the good transistor out of that set and put it in the one that had been blowing transistors left right and center and the boss said "take it home and test it" I took that set home, and ran the crap out of it in my office from 1997 through to 2001 when I sold it to a friend and they ran it right through to 2009 when the picture tube finially failed. Was an excellent set. In 2001 I purchased a 34" Panasonic HD Tau which I used right up to 2011 when I replaced it with the plasma in my studio I still use in my edit suite. I gave it to my father inlaw and it broke in 2015. He threw it out and bought a Hitachi LCD set that lasted 2 years and the LEDs failed, and is now on the second LED set.
Long live the old CRT sets.
Boy, does that look precarious...
tankyo mirs
sir can you show me were is the fucos control...
It is on the back of the flyback. There are 2 adjustments. One is master screen, and the other the focus control. and they are labeled.
THANKS A LOT SIR....GODSPEED
be VERY careful inside a TV. The main PSU caps and the tube itself can kill you if you touch them. they hold power WAY after being unplugged. the best way is to discharge them, before poking around..
I always service with an isolation transformer when I service line operated devices. The CRT will hold a charge for a bit, but unless you are poking around the second anode you are away from that. The focus lead also has about 10KV but again you have to make an effort to contact that because they are well shielded on modern TVs.
do the PSU caps pose a electrocution threat too? Those hold 120v i assume right? or do they hold higher volts.
Hi, 12voltvids you are 120voltvids
Funny how those relate. One is 10 times the other. All things equal, just move the decimal for current to be equal wattage in inverter apps
Mark Anderson thank's , i'm djust happy with this video
TH-cam can shut you down over showing a TV??
+Donald Ellett The TV show on the screen for 10 seconds showed a scene from a FOX TV show, and they filed a copyright claim for 10 seconds of one of Fox's dumb shows. I have since learned that by simply flipping the picture will prevent the trigger, but they blocked it world wide.Same goes for the series Origins that I uploaded. I didn't produce this, it was done years ago by an educational media outlet, and it long forgotten about. Well I had a few claims made from the BBC for an image of a glacier that they say is their property. So I had to cut that 7 second shot out.
They are that picky - I did not know all this - copyright laws are very strict for that little time!!!!
+Donald Ellett You have no idea.I lock horns with youtube over and over on my licensed content. That is royalty free music that I use in some of my productions, where I have purchased a license for broadcast from the content owner (musicbakery.com) and it still gets hit with false claims from 3rd parties all the time, which I have to constantly challenge.
👍
crt tv is more durable than lcd and led tv
Crt and plasma are relatively reliable. Lcd/led not sure much. They are built cheap and not to last. 3 years if you are lucky I have a few crt sets over 30 years old still going strong a yes I do use them. One is a security camera monitor and it has been running constantly since it was put in service in 1993. B/w tube. Now it is seeing life as a clock in my office. I have an app that runs on an old BlackBerry phone. Generates a flip clock. Hdmi out goes to an hdmi/video adapter then display on the tube. Just looks cool and since the display on the phone is cracked, I just use it for this purpose. Nice conversation piece, and since it is connected to network time is always exact. That's what I use that hdmi/video adapter that was doa out of the box for. Seller said keep it so I put it to use.
the crt sets are reliable been running a repair shop for years worked on quite a few and still do gave up dealing with led/lcd not worth the hassle anymore as usually cheaper to replace, I still work on a lot of vintage electronics solid state and vacuum tubes, got a few color sets from the early 1960's to pickup in the states asap to bring back I enjoy restoring tubes electronics been doing it for 25 years