Almost an impossible repair with typical home lab equipment - these SMDs must stop becoming smaller, else will will soon need to be replacing the entire PCB in case of failures! Good job Peter, thank you. 73, Kostas.
Thank-you for these excellent videos. A friends IC-7100 had this fault, luckily the low value resistors and the protection diodes were ok, so a new transistor and the radio was good to go. I really enjoy both yours & Mr Carlson"s videos for the logical approach you both take in fault finding, keep up the good work.
Hi Buddy, yes when I was recognizing the "impedance problem" with the SA I already got the feeling that there is more blown.. Hope you ae all right my friend! 73
Thanks Peter for sharing your repair of this radio. I am sure the "Old Man" was glad to get his radio back. As always, look forward to your next video. Robert.
Really enjoyed seeing your work, and especially because you can admit when you make a wrong assumption. That shows confidence. Well done and thank you again.
Fantastic video Peter and a great lesson, personally I would have thought that there was an error in the schematics regarding those resistor values and I never would have considered testing the coil, but that is why you are the master and am watching you tube videos. Great job! and thanks for sharing your wisdom, I really do mean it. Keep up the great work!!!! 73
very nice video Peter it was good of u to show how easy it is to come to the wrong conclusion sometimes i do this allot but u corrected your self very quickly and made a very good job of it. well done my friend.
Hi Gary, yes that is something happening very easy and therefore it is important to be aware about the fact that a conclusion can very easily be wrong. And off course it is not the first time I went into the wrong direction.. Thanks for watching 73
Great video. I would go blind working with SMD, I like my point to point. Maybe one day I will practice on some old SMD boards I have and see if I can do it. Thanks again Peter, another excellent lesson in electronics.
Another great repair Peter. Thought I was the only person that stacked SMD resistors to make up the value needed. Been a few years since I have had to do it but it works perfectly fine. I finally broke down and purchased SMD resistor and capacitor kits for pretty much all the different case sizes. The sad thing is I probably have a few hundred thousand SMD components and could probably pick them all up with one hand. Man those 0201's are tiny. Thank God for microscopes. :) Mike
LOL yeah that is true Mike :^) And sometime it goes down to 01005 and 0201 is already with a microscope a challenge. So let's see if it goes any further?? Thanks for watching 73
Thank you for this video. My IC7100 has this fault and it helped me decide the course of action. I cannot test this mself as I do not have the equipment, but I did learn a few things. Cheers and 73, VK6PCB.
Hi Peter, Another nice repair video. Seems more Icom radios are making it to your repair bench. :-) When you had that tiny mosfet on your finger tip, I was thinking DON'T SNEEZE. You would never find it. Nice that stacking those two smd resisitors solved that problem. WB3BJU
Hi Donald, well sometimes it looks like a ICOM run and then suddenly it is a Kenwood run or so... Yea never sneeze your component is definitely lost :^) 73
Very nice video Peter, thanks a lot; i had the same problem with a Kenwood TS-590, diodes are faulty and coils open. Compliments, 73s de IW0HEX Pasquale.
gosh I really like the way germans speak with such civility. now with the muslim invasion, they will have to learn to talk to people even in their neighborhoods a different way, because these people are not 3rd worlders, they are anti- western, in almost every respect, and our technology, they will bend to nefarious deeds. thank you derrik for such awesome work.
Hi Joe, thanks for watching...Well I believe it was high power which caused this problem... like somebody directly transmitted into the radio with 50Watt or so...like it sometimes happens during a multi operator contest...73
Lightning damage? I have done radios like that when the antenna been left inline when a thunderstorm was active…the repair was well done but I always like to know what caused it.
I have to guess this is the same 7100 that was in a bit ago due to overvolt? if so got to suspect that overvolt did more damage then thought, maybe not outright killed parts, but weaken them down and over x amount of time they just go. if that is the case it would not shock me to see that 7100 again on txrx bench.
Nice Jobe, as usual, Peter. I think Gordon Foster might have forgotten about capacitive coupling from the signal gen tip? However, if my eyes did not deceive me, the 4.7 ohm R was replaced by a 100 ohm R, not 2 x 10ohm R?? Or is it that I have been drinking too much? Hick!... 73 Tony
Help/I/am/being/eaten/by/aliens Thatsnottrue It's a 3 digit coding - the third digit is the exponent. So the resistor marked 100 is 10x10^0 = 10 ohms. Similarly, you can see the 33 ohm is marked 330.
I would of gone straight to the protection diodes that are across the RF input of the vhf section and test them, before anything else, I have seen input protection diodes blown many times, without damage to first RF amp.
Sehr schönes Video, ihre Videos gefallen mir im allgemeinen sehr gut da alles immer sehr schön anschaulich dargestellt wird. Sind sie auch Funkamateur oder gelernter Hochfrequenztechniker? MFG Jann
Hi Ajay, thank you! The probe is from here: www.reichelt.de/Klemmen-Pruefspitzen/PRUEF-2610-FT-RT/3/index.html?ACTION=3&LA=446&ARTICLE=106095&GROUPID=5630&artnr=PRUEF+2610-FT+RT&SEARCH=Pr%25FCfspitze%2BHirschmann
Peter, did you choose larger resistors on purpose? Larger means higher power (mw) so should survive similar high signal input event again without "toasting".
@ 48:20, top left above green coil, there are two resistors. 330 and 47. The 4-something resistor also looks burnt. That circuit is for another band right? Also for the two open resistors the dark spot in the middle was a dead giveaway that they were blown. But again, i am young, have sharp vision and a big 1080p TV to watch these on. :) I do enjoy the detail that you go to in your videos. Regards.
hola. soy de argentina. y tengo una falla en mi icom7100. en recepcion vhf. hay alguna posibilidad de ver el video este traducido o subtitulado en español. desde ys muchas gracias. y espero su respuesta,.
@@TRXLab I don't use VHF very often so I can't say definitively when or therefore how it happened but that is what I was thinking. I love watching your videos. I love that you take time to test and troubleshoot. I have a handheld I need repaired if you'd possibly like to do it.
@@TRXLab actually upon thinking about it. I was driving near the local repeater site a few weeks ago while listening to hf. I wonder if that was when it happened. Oddly, it was that repeater that confirmed I had no receive. I was about 3km away and could barely hear it.
I sent mine in for warranty repair and it was only q551. I've looked at the part, I have a SMD desoldering and soldering station and even so, I didn't want to mess with it myself. I found even more respect for you guys that do these repairs.
I had to laugh, looking at the removed components on the lighter colored paper. fly specs. I laughed because I would like to think back to a 1940's tech, looking at this video, what he would have thought as he put in the next dog boned resister.
thats what you get when two radio's and antennas are to close, burned the hell out of this radio, wonder that there is nothing wrong else as this coil, and the two resistors!
Thank you for talking-and-showing us through your diagnostic thought processes. Very interesting.
Almost an impossible repair with typical home lab equipment - these SMDs must stop becoming smaller, else will will soon need to be replacing the entire PCB in case of failures! Good job Peter, thank you. 73, Kostas.
Well yeah it is true you need the right tools and a bit experience...Thanks for watching 73
Another great video! I was an electronics design engineer at Marconi back in the 1980's and 90's and you have inspired me to re-start my hobby.
Thank-you for these excellent videos. A friends IC-7100 had this fault, luckily the low value resistors and the protection diodes were ok, so a new transistor and the radio was good to go. I really enjoy both yours & Mr Carlson"s videos for the logical approach you both take in fault finding, keep up the good work.
Thank you Stephan! Yes Paul is a very nice guy for sure 73
Peter I like the way you troubleshoot. I all so like the way you think about alternate solutions with paralleling the resistors. Great Work :)
Thank you Grant. Yes the stacking is a acceptable way to do it. 73
Nice troubleshooting Peter. Did not surprise me to see other components failed. Another fantastic repair..
Hi Buddy, yes when I was recognizing the "impedance problem" with the SA I already got the feeling that there is more blown.. Hope you ae all right my friend! 73
.Cool deal Peter. Yep, other than a little head cold doing really great. Ready to get back into making some videos. 73
very good to hear that my friend. All the best to you and yours!
Thanks Peter for sharing your repair of this radio. I am sure the "Old Man" was glad to get his radio back. As always, look forward to your next video. Robert.
Thank you Robert! 73
@@TRXLab peter im in wales do you do icom 7100 please
Really enjoyed seeing your work, and especially because you can admit when you make a wrong assumption. That shows confidence. Well done and thank you again.
Thanks for watching and feed-back 73
Fantastic video Peter and a great lesson, personally I would have thought that there was an error in the schematics regarding those resistor values and I never would have considered testing the coil, but that is why you are the master and am watching you tube videos. Great job! and thanks for sharing your wisdom, I really do mean it. Keep up the great work!!!! 73
Thanks for the kind words Michael! All the best and 73
very nice video Peter it was good of u to show how easy it is to come to the wrong conclusion sometimes i do this allot but u corrected your self very quickly and made a very good job of it. well done my friend.
Hi Gary, yes that is something happening very easy and therefore it is important to be aware about the fact that a conclusion can very easily be wrong. And off course it is not the first time I went into the wrong direction.. Thanks for watching 73
Great video. I would go blind working with SMD, I like my point to point. Maybe one day I will practice on some old SMD boards I have and see if I can do it. Thanks again Peter, another excellent lesson in electronics.
Excellent job, Peter! Looks like you have been getting some repairs lately that other guys wouldn't touch! Keep up the great work. 73...Dan w4mnc
LOL it is always changing...Thanks for watching 73
Another great repair Peter. Thought I was the only person that stacked SMD resistors to make up the value needed. Been a few years since I have had to do it but it works perfectly fine. I finally broke down and purchased SMD resistor and capacitor kits for pretty much all the different case sizes. The sad thing is I probably have a few hundred thousand SMD components and could probably pick them all up with one hand. Man those 0201's are tiny. Thank God for microscopes. :)
Mike
LOL yeah that is true Mike :^) And sometime it goes down to 01005 and 0201 is already with a microscope a challenge. So let's see if it goes any further?? Thanks for watching 73
Hi Peter ,
We always learn a lot from your videos
thank you and congratulations to the great videos
Thank you and all the best 73
A really involved and great tutorial. I really like these deep technocentric research and repairs. Thanx for the video
Thanks for the nice words! All the best and 73
Thank you for this video. My IC7100 has this fault and it helped me decide the course of action. I cannot test this mself as I do not have the equipment, but I did learn a few things.
Cheers and 73, VK6PCB.
Another great troubleshooting video, great job Peter, thanks Greg
Thank you Greg 73
Great video. We learn something every day. I always enjoy your videos. Thanks Pete.
Thanks for watching Henry! 73
Hi Peter,
Another nice repair video. Seems more Icom radios are making it to your repair bench. :-)
When you had that tiny mosfet on your finger tip, I was thinking DON'T SNEEZE. You would never find it. Nice that stacking those two smd resisitors solved that problem. WB3BJU
Hi Donald, well sometimes it looks like a ICOM run and then suddenly it is a Kenwood run or so...
Yea never sneeze your component is definitely lost :^) 73
Hello Peter! Nice video and a good troubleshooting!
Thanks for watching 73
Thankyou Peter really good camera work on this one.
Thanks a lot 73
Very nice video Peter, thanks a lot; i had the same problem with a Kenwood TS-590, diodes are faulty and coils open. Compliments, 73s de IW0HEX Pasquale.
Thank you Pasquale! Take care! 73
Danke Peter, wieder klasse 73
Immer wieder gerne! Danke fürs vorbeischauen! 73
This Rig is very very problematic.
But have one good technician for repair.
Good job!
Very thorough and informative as always my friend.
Regards
John
Thank you my friend! Always glad to see you ! Take care 73
gosh I really like the way germans speak with such civility. now with the muslim invasion, they will have to learn to talk to people even in their neighborhoods a different way, because these people are not 3rd worlders, they are anti- western, in almost every respect, and our technology, they will bend to nefarious deeds. thank you derrik for such awesome work.
Thanks Paublus! I have to admit that I'm not 100% sure what you mean...73
Hi Peter. Great to watch another repair. I wonder if you have an idea what caused that high DC voltage that killed those components? 73 Joe AL3A
Hi Joe, thanks for watching...Well I believe it was high power which caused this problem... like somebody directly transmitted into the radio with 50Watt or so...like it sometimes happens during a multi operator contest...73
u r a brilliant mind.
I though would just change the whole board.
not much of price difference but more years of service and piece of mind.
Awesome work man!
Very interesting. Another great repair.
Thank you Simon! Cheers
Lightning damage? I have done radios like that when the antenna been left inline when a thunderstorm was active…the repair was well done but I always like to know what caused it.
I have to guess this is the same 7100 that was in a bit ago due to overvolt? if so got to suspect that overvolt did more damage then thought, maybe not outright killed parts, but weaken them down and over x amount of time they just go. if that is the case it would not shock me to see that 7100 again on txrx bench.
Hi, no fortunately it is a different radio and even if the power path was fine the problem was in the signal path.. Thanks for watching 73
Nice Jobe, as usual, Peter. I think Gordon Foster might have forgotten about capacitive coupling from the signal gen tip?
However, if my eyes did not deceive me, the 4.7 ohm R was replaced by a 100 ohm R, not 2 x 10ohm R?? Or is it that I have been drinking too much? Hick!... 73 Tony
The last digit on the SMD resistor is the multiplier / number of zeros. 100 = 10 ohms, 101 = 100 ohms, 102 = 1,000 ohms.....
Help/I/am/being/eaten/by/aliens Thatsnottrue It's a 3 digit coding - the third digit is the exponent. So the resistor marked 100 is 10x10^0 = 10 ohms. Similarly, you can see the 33 ohm is marked 330.
MikesRadioRepair
Ah, I did wonder. My eyes being so bad these days, I never noticed.
I would of gone straight to the protection diodes that are across the RF input of the vhf section and test them, before anything else, I have seen input protection diodes blown many times, without damage to first RF amp.
Well there a always different ways of approaching a problem but in this case we have seen that the diodes a intact and the FET was blown.....73
Indeed, still a very good repair video, I always enjoy watching them.
another nice repair just about the right amount of detail. One question what is the part Q552? I googled LOTC143ze but got no result
Thank you Mike! 73
Sehr schönes Video, ihre Videos gefallen mir im allgemeinen sehr gut da alles immer sehr schön anschaulich dargestellt wird. Sind sie auch Funkamateur oder gelernter Hochfrequenztechniker? MFG Jann
vielen Dank Jann. gelernter Nachrichten Ing
Nice one Peter. M3KQW 73s
Thank you Howard..73
Nice job
Nice video as usual , where can i buy the red color probe which is spring loaded and what is it called
Hi Ajay, thank you! The probe is from here: www.reichelt.de/Klemmen-Pruefspitzen/PRUEF-2610-FT-RT/3/index.html?ACTION=3&LA=446&ARTICLE=106095&GROUPID=5630&artnr=PRUEF+2610-FT+RT&SEARCH=Pr%25FCfspitze%2BHirschmann
Thanks Sir
Oh, and any idea what could cause this fault? Or is it just something that happens after a certain age?
Wonderful !!!
What would have caused the failure?
Thank you Bruce! I believe it was a big signal into the VHF path...73
TRX Bench Like a direct discharge?
Peter, did you choose larger resistors on purpose? Larger means higher power (mw) so should survive similar high signal input event again without "toasting".
Well may be but the coil would suffer again, so it make no real sense. So it was simply because I did not have the right size. 73
Maybe not. If 4.7 resistor didn't toast then maybe input signal would get clamped and limit current reaching the coil?
Somebody else would have just stopped going ahead after replacing the dual gate fet.
It looks like the deal gate had been remplacerend before. The solder job is different than the serounding solder.
Hi Joop, no I'm sure that this path has never been touched before. May be it because I have put my probes a couple of time into the pads ... 73
I need the filters replaced on my 7100..I was wondering how to get ahold of you to send it to you?
@ 48:20, top left above green coil, there are two resistors. 330 and 47. The 4-something resistor also looks burnt. That circuit is for another band right?
Also for the two open resistors the dark spot in the middle was a dead giveaway that they were blown. But again, i am young, have sharp vision and a big 1080p TV to watch these on. :) I do enjoy the detail that you go to in your videos. Regards.
Hello friend
where can i find this part to buy?
my ic-7100 has the same problem
thank 73
Hi noticed that at 20:53 you are injecting a signal in to get the receiver to work but the screen has the TX lamp on so its trying to transmitt.
Hi Clive, no it means that is the TX frequency. The TX LED is under the volume control. 73
Hola soy mexicano. Y tengo un icom ic 2100h pero dejo de trasmitir que me recomiendan. Gracias espero alguna ayuda
As always good video, thanks a lot.
Thanks Michael! 73
great vid well dune on fixing it
Thank you Drew.. 73
i have 7100
vhf is 17watts to 20 watts only
uhf and hf, no rx and tx
is there a chance to repair?
hola. soy de argentina. y tengo una falla en mi icom7100. en recepcion vhf. hay alguna posibilidad de ver el video este traducido o subtitulado en español. desde ys muchas gracias. y espero su respuesta,.
Great work thankyou for video
Thanks for watching my videos Dennis !! 73
Is this the same Radio IC-7100 that you fixed on video #112 killed by over voltage?
No this is a different radio. 73
Thank you
Please i use ICOM V8000 suddenly, it does not send and never receives what do you expect the reason for… thank you bro…
My ic7100 just developed this problem. How many others have had this issue?
it often happens if the radio gets to high input level into the receive path such as near by radio stations...
@@TRXLab I don't use VHF very often so I can't say definitively when or therefore how it happened but that is what I was thinking. I love watching your videos. I love that you take time to test and troubleshoot. I have a handheld I need repaired if you'd possibly like to do it.
@@TRXLab actually upon thinking about it. I was driving near the local repeater site a few weeks ago while listening to hf. I wonder if that was when it happened. Oddly, it was that repeater that confirmed I had no receive. I was about 3km away and could barely hear it.
I sent mine in for warranty repair and it was only q551. I've looked at the part, I have a SMD desoldering and soldering station and even so, I didn't want to mess with it myself. I found even more respect for you guys that do these repairs.
I had to laugh, looking at the removed components on the lighter colored paper. fly specs. I laughed because I would like to think back to a 1940's tech, looking at this video, what he would have thought as he put in the next dog boned resister.
Yeah that is a good question lol...Thanks for watching 73
I have that problem on my 7100 nothing on 2 meter.
You cannot have point one hundred. It's point one.
Hii bro my ICOM IC 2200H RADIO PROBLEM OUTGOING FAST BUT RECEIVED NOT found Tx OK but Rx not coming what is the problem sir
thats what you get when two radio's and antennas are to close, burned the hell out of this radio, wonder that there is nothing wrong else as this coil, and the two resistors!
hallo sir...my old icom ic 2100 no rx please help me..thanks
Toooooo booooooooring to watch
You always can skip videos on YT, simply go on