2 ways to test bridge rectifiers & check standby volts on power board using meter
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- เผยแพร่เมื่อ 2 ต.ค. 2014
- How to test bridge Rectifier & check standby volts on power board using digital meter "dvm", just check multimeter in diode mode to read "bridge rectifiers", diodes, and transistors. also test bridge rectifiers in ac & dc mode on meter. if you have 5v stndby but no stdby led on tv then i would check main logic board, this works for Sony, Samsung, LG, Vizio ect..
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I'm an elderly gentleman with time on my hands and decided to learn a bit about electronics, specifically television repair. I have learned SO MUCH from your videos! You are amazing, your knowledge, and the way in which you present your videos. Thank you so much ....always looking forward to your next one.
He the 👌 👍
The video is very helpful! It is not just very good in understanding the bridge rectifier, but understanding the process and flow of operations is important in diagnosing where the problem lies. Case in point is I actually did not know that it was the video controller board that kicked the signal back to the power supply board to release the voltages and current to the other components. I've picked up five flat screen TVs from the curb side and have fixed four of the five. And in large part, thanks are due to this lad by his excellent explanations. Although I hold a BA in computer sciences (but in Windows XP) and years of experience in soldering, that only enabled me to be potentially able to repair the TVs. TampaTec's descriptions and explanations has helped me over the hurdle to effectively diagnose and then repair the TVs on a component level.
Thanks man!
Congrats on your success. I hope you run into a big 4k tv to fix. Usually it's bad led strips in 4k TVs that go bad after few years. Shopjimmy.com sells repair kits.
I still trying to understand, but I can tell this is the best tutorial on TH-cam for this topic.
I need to test a BR on a bass amp. Even though it was for a tv you video was great and you did a great job answering the questions I had along the way. Thank you!
Another great tutorial Paul! I enjoy watching your videos, because you go straight to the point and I can learn something new about electronics. Thanks for sharing!
ElectronFun.com thanks
thx, I'm still learning how to fix this new stuff, I took tv repair classes in 1978 and only worked on vacuum tube tv's. Later on I did get to work on transistor sets. We have to keep learning every day if we are to keep up with our trade.
Love your videos mate. You r an electronics master from whom many people learn. keep up with the great videos mate. Cheers
MAN... U R SIMPLY AWESOME... ONCE I THOUGHT DEALING WITH ELECTRONICS IS LIKE DEALING WITH ROCKET SCIENCE.. BT NOW I AM CRYSTAL CLEAR WITH THESE THINGS... THANKS FOR UR WORK DUDE..
Thanks man
+Tampatec hey buddy i want u to know you are doing a great job thanks for taking your time to make these videos.
I do have a problem with my LCD TCL 40" it's a smart TV however for some reason i can't get it to connect to the Internet i plug the WiFi router at back of my TV but the TV isn't responding.
I am planning to use Chrome Cast.
Do you think it's a good idea to invest in the Chrome Cast?
Will it work?
+Tampatec hey buddy i want u to know you are doing a great job thanks for taking your time to make these videos.
I do have a problem with my LCD TCL 40" it's a smart TV however for some reason i can't get it to connect to the Internet i plug the WiFi router at back of my TV but the TV isn't responding.
I am planning to use Chrome Cast.
Do you think it's a good idea to invest in the Chrome Cast?
Will it work?
+Tampatec I forgot to mention, what i want is to connect my phone with the TV .
Great video as usual thanks for your postings, I find them very helpful as I'm sure others do also, in helping to understand the works of these electronics.
Nice tutorial as always.I have been teaching myself repair with books and tutorials like yours and a couple of others that take time out to pass on their knowledge and tricks of the trade.I just want to say Thank you and let you know how much you are appreciated.
cool thanks, tv repair trade is slowly fading away, back in the 90's tv repair shops were many, my dad and older brother had a tv shop back then in NJ after my dad died so did the business.
***** I tinker with everything I find. I've been like that since I was a kid.I am in my 50's now.I just like to teach myself new things.I enjoy taking something from trash and fixing it.;)
Pretty darn good video!!!! Very informative and terrificly descriptive.
I love your videos, everything is so easy to understand ... Thanks a lot
Gracias tampatec great videos man keep it up....thanks
good info.. still coming back here for some knowledge and I thank you !
Thanks learning alot. Mine is a 50" inch samsung plasma. With the lower half of the screen black. If I put a fan behind the tv usually I don't have a problem. Your diagnostics are helping me narrow it down. Some say it is the T-Con board. But I don't know how to diagnose that yet. I do have a red light.
I enjoy all the videos and learning tips like to solder and fix tv boards... Thank you
thanks jason, i enjoy helping people that's why i post these videos and started google helpouts.
Thank you for this great video. Very clear and useful info.
Another good video, Thanks!
Really helpful videos man, thank you
Keep it up bro. I like your videos
Yeah man that helps me a lot. Specially the DIOD thing.
Thanks mann... :)
Nice video. And thank you for speaking English.
thanks for the video..simple and clearly explained..
Nice explanation, as always.
Yes. it's very informative. I would have loved if you showed it a bit clearer how to check the voltage AC and DC on the bridge rectifier. Sorry, I am a beginner learning a lot from you. Thanks.
Thanks again for that outstanding information, keep up the good work ⭐⭐⭐⭐⭐
Nicely done
thanks this helps a lot
Thanks that’s helps a lot
good explanation thank you
Very basic and helpful
that is a good tutorial video.
Best man,
not just saying it, but i realy learn everytime something new from you. thank for your time.
Q: In this video approx..time 4:44 you mesured Ac and Dc from rectifier. Do you know why I have no ac also no dc on rectifier? D10XB60 when i switch tv on ?(Lg 42PQ2000 plasma TV).?
I have blue light flashing 7x then stays blue for a while and gets Red ( remote acts only on Tv-on .
I mesure 5 V andbut no 12..17..or 24 volts.
Thank you for reading this.
Nice vids you're posting up in here...quick question. Is it possible to have a bad rectifier and still get solid Standby power?
You arete man! Thanks man
good tutorial.
Tocayo, your videos are great! I have a 55" Toshiba REGZA like the one in your video that died. I was going to throw it out until I saw your video and became a subscriber. I ran all your tests and it turns out I had the same bad fuseable resistor that you did. However, after I changed it I got good standby voltage but then the bridge rectifier was giving funny readings: 120v AC, 116v DC, and .9, .9, and 1.0. I removed the Bridge Rectifier from the board, checked it and got normal readings of .5, .5, and 1.0. I figure something else is causing it to act up when powered on the board. By any chance are you going to do a video on that problem?
nice man.i like
Hi, tam I check my bridge rectifier with a meter & it's shorted out, cause I didn't hook up my isolation transformer. BTW its a great video tutorial
Great tutorials. I'm just trying to fix a tv with no standby light, its got a steady 236v (UK) going into the bridge rectifier but the output is pulsing. Its a 4 diode design, what do you suggest I do, replace all 4 diodes? all diodes read .46 ohms in circuit.
This set has a row of pins marked from the bottom (pin 1) up: gnd, gnd, 5v, 5v, ps/on, 5vs, 5v, 5v, gnd, gnd, gnd, 12v, 12v.
The two pins 5vs and ps/on, is that five volts standby and power supply on?
Hey Tampatec, Great work. Keep it up. So good to find your channel after searching all the other junk that is online claiming to show TV repairs.I have a Palsonic LEd TV with no sound or picture, but the standby light is green when power is turned on. Would you agree that it not the power supply and probably the main board? Would it be best to swap main board?Could not see any obvious bad capacitors or damaged components.
+Apa Ched hi I have the same problem do you able to fix what was the problem. would you let me know thank you calin19732live.com thank you again
Good. Thanks
Great video! I have no standby power. I replaced the power supply board and still no standby power. Does this mean I got a faulty board or that I should replace the main board?
Nice and use full video
Tnx sir 🙏
Hi Tempatec, keep up the good work! Love your videos.
When i get around 5.00 minute mark when testing my Samsung UE43KU6000K, testing the AC power it starts sparking and the fuse in the plug dies, what is the problem? Thanks
Tampatec, could you explain how to controll transformer in a circuit?
Thanks.
Hello Tampatec, may I assume that you are from Fla.?
I have a 42in Sylvania Lcd that wont come on. My stby switch is on, but when I power up, the green light flashes rapidly 17 times and reverts back to standby mode. At first I would keep tapping the power switch on the tv and it would sometimes come on. Now, after a few weeks of that nonsense, it refuses to come on at all.
All the components look good on the power board. I just finished watching your video above on bridge rectifiers and standby volts and I am going to be checking those out. Do you have any other suggestions that I might try. This is my first attempt at repairing a TV but I am very determined to be successful. You are a great teacher and I shall keep learning from you. Thank you for your desire to be helpful to your green colleagues.
hey tampatec, how do you test a zener diode? thanks
Thanks for tutorial, i m notgetting 5v sdy. on rectifier i get 122DCV, & 120 ACV, , Is that means i my powerr card is bad or main card pl . let me know
Hi, I have a Sony 55" that will not power on and no standby light. I am reading 7v on standby that is supposed to be 3.3v, what would you suspect and would this high reading prevent standby and powering on?
Hi Tampatec, I have a sharp 52 inch LC-52E77UN LCD tv. My tv is dead no lights light up when the power button is pressed. I diagnosed the power supply RCENCA336WJQZ and there is no 5 volt standby. So, I replace the zener diode, and two resistors in the secondary unit (power supply kit for secondary voltage from Shop Jimmy), still no standby volts, no lights on the front panel. I have voltage now at the zener diode but not at the standby voltage connection. Checked ac voltage supply and bridge recitfier all good. Any recommendations you can provide is greatly appreciated before i purchase a new power supply.
Thanks,
Quincy
Does this apply to Sony str-dn1070 also? My unit powers on right away and says clearing on the lcd and power cycles every 2-3 minutes. Tried factory reset a billion times. could that be caused by a bad BR diode? main board is getting the stand by voltage.
Diode mode test between + and + shouldn't read double diode voltage drop? like 0.9V?
I have sony KLV-40BX400 lcd TV, it has bad picture at time (distorted picture) but again works ok, can you specify if this is a problem og Tcon board
Very cool watch I see in the video... Is that a smart watch?
yes pebble watch, i did review on it, i love it
Good video.
Whenever I plug my LG 42 inches 3D TV to power, the fuse in the 3 pin UK plug attached to power cable with which I connect the TV to the mains blows off immediately. I changed the fuse and same thing happened again. Please, What could be the fault and what do you suggest I should check?
Thank you.
Thank you bubby we love you in ohio
good one
Power board separated from Main board, and when checked with power on, multi/m shows standby 5.2V
but not 12 V on the socket. Why? Thanks for any advice.
163.3 is that linked to us voltages or does it not matter for uk at 230 v should it be the same.if not what should it be.
Hi I have a bush LCD40TVO7HD it's clicking on startup there was 5 bad cap on power board which I have replaced but it's still doing the same thing
I tested the 24v out to the main board and its reads 0v to 6v than back to 0v and so on
The t con board clicking as well it's like click click pb and t con
Where the cap have been replaced the wires to backlight inverter are a bit and only a bit discoloured
I've got a new pb coming but don't fancies blowing it
Any help on what to test and what reading I should get wil be much appreciated thanks
Dek121
Can a "pinhole" in a resistor be the cause of my TV turning on / off and not staying "on" ? (Red light, stand-by mode, I guess)
Model : Panasonic TC-L50EM5
BOARD : TNP4G532
Resistor : R7305
Another well done demo for testing a power board.
My power board is putting out 19.5v where it says 12v. Why would that be?
Tampatec, Can I ask for some explaination or assistance for this issue? Actually, my colleague gave me his TV (Sharp) because it not working properly. Actually it has a scan loop. When plugged in, it starts scanning, get to 100% and starts all over again from 0% and on an on. I have thought that an IC on the power board might be the cause. But I am not sure. How could you possibly explain and what could be the solution. Thank you.
Looked at bridge rectifier. Tested as indicated and have 0L with negative probe on neg pin when I switched it pos probe on neg lead still 0L across. If I put in resistance mode I get 9.00 on ac pins and Ol on positive with neg to neg. Flipped I get 1.5 to ac pins and -3.5 to pos pin. But I do have 5.11 on both standby. Nothing on ps on. Which I saw some jump 5v standby and ps on to see if they get the 12 and 24 volts on power board to verify if it's main.. Am I correct? Any assistance would be greatly appreciated.
I have a Element flat screen tv, Model ELEFW328. Serial # F6B6MDA1E32063303. It has no standby light and no power. The power board and main board are all in one. How do I test it? I did get another board and changed it but with that board I had to green screens, one on top of the other and could not change menu, source or anything. I did have power with that one. Any help would be appreciated. Thanks
Quick help on a vizio e421vo standby light is on but no results from power on from either remote OR manual button. Already did the power cycle with no results. help@! I'm a mechanic not an electro guru :/
Hi! I have a lg power source that i checked and all the voltage are in parametres. But i have a red led on it that is blinking 5 times, and no image on tv.
Please respond, i am a subscriber and watch tons of your videos. I get 171 dc volts but when i switch to AC i get 119v then drops to 0. What should i try? Thanks.
Tampa tech I've 42'' sanyo tv dp42740 it comes on beautiful and after 2minutes it shuts down green light flashes 2 to 3 times and no more tv. What board is that? Can you help me out?
My standby light is on I can sometimes turn the TV off I just do not have any back light. The standby light turns to blue and it usually is a dim red when working properly. It looks like the main board is bad. By the way I had a Google Chrome on the HDMI I think that may have damaged the main board what do you think? This an LG42LG50. I also measured 24 volts 16.5 and 5 volts on the power board. It stop working for a while we turned it off. After a couple of days it turned on played and then got to this state where the blue light in on under the power button and no display. Usually you hear some kind of relay clicking turn on process. Please help if possible it is the wife TV. Thank you in advance.
FYI that silver heatsink he's touching, don't do that with the set on, I got a pretty good shock doing that.
Bro if no dc output is it broken? Because when i try to test the output dc of rectifier noting comes out only input ac voltage
What would cause the output at the pins to keep turning on and off
I have an tv grand wega rear projection sony model kf60we610 when I want to turn on my tv even the red light flashes could you tell me what is wrong please............thank you for the support.
Hi, great videos, I have a problem with my 52" sharp TV, model# (LC-52D64U), I have flashing power and opc lights (2 fast power and opc blinks and 1 slow power blink) but it will not turn on, I do have electronics background but not working in the trade and never worked on these flat screen tv's and without a proper shematic diagram its kind confusing.
I have already replaced the power board (RDENCA235WJQZ) and also the main board but still no luck, on the power board I have 120vac going in and I have 5vdc stby voltage but not getting any other voltages mentioned on the board like 12volts and 60 volts going to the inverter boards even with the power board forced on, the inverter boards are probably ok since I'm not getting any votages going to them, can you please give some pointers on this problem that I'm having?, any help will be greatly appreciated.
Thank you,
Joe
Sir, is it possible to replace GBU606 bridge rectifier with KBU8k ?
How in the world is it correct that from the negative to the positive of your rectifier is .445 volts while to each of the AC pins it is .556 volts and you say it is a good rectifier. Shouldn't from the negative to positive DC of the rectifier be double like 1.1 volt or so? That is two diodes combined. Confusing as hell.
Can u make a video on burt out toroids and how to find value of it i cant find schematics any where on this flat screen proscan i got
I wanted to check standby volts on my vizio D33X-G1 smart tv the legend near the connection from the power supply board to the main board does not show what pin is the standby pin and does not state what the standby voltage should be It just has a split box with one side showing from top to bottom on/off,NC,gnd,gnd,VA,VM,VM. AND NC. OTHER SIDE OF BOX SHOWS DIM,PS_ON,GND,GND,VA,VM,VM,NC. Can you figure this legend out? what pin is standby and proper volage?
Could you tell me how to test a stk461?
my board is not label but getting 12v readings on two pins????
toshiba 19AV600U . cant find diagrams anywhere...
IS YOUR OUTPUT DC VOLTAGE MEASUREMENT INCREASED BY THE FILTER SMOOTHING CAPACITORS THAT ARE IN PARALLEL TO THE DC OUTPUT? NORMALLY, WITHOUT A LOAD, THE OUTPUT DC SHOULD BE QUITE LOWER THAN THE RMS OR AVERAGE INPUT AC VOLTAGE MINUS THE DOUBLE Vf OF THE RECTIFIER'S DIODES. IS THIS THE CASE HERE?
Every bridge rwctifier should read same voltage has yours, ac or dc. Or do they varied. Cause i check bridge rectifier and gives 327 dc.
You are in Europe. That's good.
queststion on this, i get a fluctuation on my meter when testing all legs in circuit. the meetr eiter raises or lowers the reading. do I have a bad rect? also I got a buzz off the heat sink. any thoughts
no you have a bad part, maybe transformer , volt regulator ic , transistor
@tampatec same issue here, can you demonstrate or explain in more detail please.
I have a Vizio P65-C1 but it doesn't have standby volts. The only voltages going to the mainboard are 19V and they're all reading 0V
if two sources 24v dc connected too cother with bridge rectifier what happen then
Where are the video help out links?
THANKS NICE TUTORIAL
Dear sir My Sony KDL-434755C tv have amazing problem when i turn on TV it shows sony logo and adroid animation log after that it disappear and red light blinks 6 times. could you please help me ho can i fix it or what will be the cause.
Mine seems to jump from 0-2.8 volts, has flashing standby light but wont turn on. No apparently bad capacitors. Samsung curve UN55JU6700.
Make that where are the "Google help out links below"?
Which multimeter do you recommend?
Get a fluke, the 87 V is the best but expensive, the cheapo MMs just don't cut it.
Sir what if there's no red led light but if I try to turn it on, it's working but a few seconds it showed the logo it turned off.
Hello sir .. i have samsung L32SF_EHS supply .. so the problem is when i connect led back lights with bord .. its coming on .. off .. on off with high voltage .. i have no idea what happen whan i test led backlight circuit board voltage is comming 150 volt
Hi Tampatec. I'm Ricky from Singapore. Having a Philips Model 47PFL6008H/12, Serial FZ1A1341023971. When I power on only a little red light on and blink and off blink again. Please let me know the problems. Tq.
Hmmm... I'm confused, I'm not getting a voltage when I test the standby but if I try ko turn on the tv it turned on but after a few seconds it turned off, my question is what is the faulty the power supply board or logical board? Thanks
Same..
I am retired senior citizen. i am electrical engineer in power systems. not electronics. Since i have ample time started learning electronic eqpt repairs. i have old UBL DSC500(230V)-Digital simply cinema. The problem is when the unit is switched on it remains on for a while and then trips. no dc power. After 10-15 seconds the switches on and trips once again . this goes on. I tried to identify defective component in SMPS. but i could not. Everything appears good on SMPS. Visibly main board appears clean. Can you please advise how to go about?
thanks.