Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting TVs and Video Sources
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 08-02-2019, 09:50 PM   #1
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Hello everyone, I have a panasonic tc-p50g20. There was some flash of electricity and after this event the TV began to flash 10 shots. However, when I press the power button after the relay clique when reconnecting the TV, it flashes 4 shots. So I followed the troubleshooting guide for the 4 blinks. The last test gives 3.3 volts on pin 9 of connector P7. Subsequently, he tells me to change the P-Board.I would like some help in targeting the problem component on the P-Board. By the way, The VSUS and P15 is dead. By cons, I did the different test the Short for VSUS VDA and P15. No results below 1kohm.Thank you for your help.Jeff
autoperformance is offline   Reply With Quote
Old 08-03-2019, 07:26 AM   #2
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Unplug the tv and wait 10 minutes. Unplug the connector going from the power supply to the SC board. Plug tv back in, turn on and see if you get 7 blinks. If you do, the SC board is bad. They are very hard to find. You must also check the upper and lower buffer boards.
tvtimmy is offline   Reply With Quote
Old 08-04-2019, 10:13 PM   #3
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Quote:
Originally Posted by tvtimmy View Post
Unplug the tv and wait 10 minutes. Unplug the connector going from the power supply to the SC board. Plug tv back in, turn on and see if you get 7 blinks. If you do, the SC board is bad. They are very hard to find. You must also check the upper and lower buffer boards.
What the name of the lower and upper buffer boards ?

I will do some test tomorrow. I will come back with the result ?

Thanks again
autoperformance is offline   Reply With Quote
Old 08-05-2019, 07:39 AM   #4
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Sens a pic of the whole backside of your tv, showing all the boards.
tvtimmy is offline   Reply With Quote
Old 08-11-2019, 09:31 PM   #5
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Quote:
Originally Posted by tvtimmy View Post
Sens a pic of the whole backside of your tv, showing all the boards.
How I post a picture ?

I can't upload file...
autoperformance is offline   Reply With Quote
Old 08-12-2019, 06:33 AM   #6
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Do these steps in order.
Attached Images
File Type: jpg sketch-1565609438882.jpg (68.5 KB, 8 views)
File Type: jpg sketch-1565609439243.jpg (63.7 KB, 7 views)
File Type: jpg sketch-1565609439405.jpg (68.6 KB, 6 views)
tvtimmy is offline   Reply With Quote
Old 08-12-2019, 09:45 AM   #7
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Ok here the back of the tv
Attached Images
File Type: jpg 20190726_200844.jpg (780.2 KB, 16 views)
autoperformance is offline   Reply With Quote
Old 08-12-2019, 09:47 AM   #8
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Quote:
Originally Posted by tvtimmy View Post
Unplug the tv and wait 10 minutes. Unplug the connector going from the power supply to the SC board. Plug tv back in, turn on and see if you get 7 blinks. If you do, the SC board is bad. They are very hard to find. You must also check the upper and lower buffer boards.
if I do that the voltage will go up to near 200 volts… Is not Dangerous to blown an other board ?
autoperformance is offline   Reply With Quote
Old 08-12-2019, 11:31 AM   #9
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Do the test and see if the blink code changes. Only run it like that for 1 minute!
tvtimmy is offline   Reply With Quote
Old 08-12-2019, 12:03 PM   #10
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

So I disconnect P2 and SC20(tape cable)?
autoperformance is offline   Reply With Quote
Old 08-12-2019, 01:10 PM   #11
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

I'm not at home right now, but I did all the short circuit tests that were negative. I also did the test attached and it came to the conclusion that it was the Power Supply Board since I had 3 volts on the pin 9 of P7 connector l. If it helps to draw a conclusion. I also ordered a rebuild kit for the P Board from Shop Jimmy. Thank you for your help again! For Now I change the IC201(resonance control) & IC202(Comparator) both thing hard to test. So here I am right now.
Attached Images
File Type: jpg 20190812_135828.jpg (626.6 KB, 8 views)
autoperformance is offline   Reply With Quote
Old 08-12-2019, 09:41 PM   #12
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

I suspect some component that handles P15V
So the D351 (VDFMEN210A)
Q355 (2SJ651)

Both are hard to find and both cost $35 & $43 from Panasonic.

Do you know where can I buy for a cheap price ?

Thanks
autoperformance is offline   Reply With Quote
Old 08-13-2019, 12:04 AM   #13
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Quote:
Originally Posted by tvtimmy View Post
Do the test and see if the blink code changes. Only run it like that for 1 minute!
OK I do the test and the code change for 7 blinks... So you are sure if I change the SC board the T.V gonna work again. This board is expensive and hard to find.

I change lot of part like I said on the P board always the same 4 Blinks.

Should I do some short test on the SC board to be sure ?

Thank you for your help.
Attached Images
File Type: jpg 20190813_004850.jpg (743.8 KB, 5 views)
File Type: jpg 20190813_004915.jpg (672.9 KB, 8 views)
File Type: jpg 20190813_004933.jpg (979.5 KB, 8 views)
autoperformance is offline   Reply With Quote
Old 08-13-2019, 12:05 AM   #14
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Quote:
Originally Posted by tvtimmy View Post
Unplug the tv and wait 10 minutes. Unplug the connector going from the power supply to the SC board. Plug tv back in, turn on and see if you get 7 blinks. If you do, the SC board is bad. They are very hard to find. You must also check the upper and lower buffer boards.
Where is the lower and upper board ?
autoperformance is offline   Reply With Quote
Old 08-13-2019, 12:27 AM   #15
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Somebody already buy this repair kit for SC board from Panasonic?
https://rover.ebay.com/rover/0/0/0?m...2F264068812631
autoperformance is offline   Reply With Quote
Old 08-13-2019, 05:44 AM   #16
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Upper and lower buffer boards.
Attached Images
File Type: jpg sketch-1565692966693.jpg (84.6 KB, 7 views)
tvtimmy is offline   Reply With Quote
Old 08-13-2019, 06:43 AM   #17
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Is it hard to repair the SC board or if it's normally a bunch of IGBT shorted ?
autoperformance is offline   Reply With Quote
Old 08-13-2019, 06:52 AM   #18
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

This model is VERY difficult to repair.
tvtimmy is offline   Reply With Quote
Old 08-13-2019, 10:38 AM   #19
autoperformance
Member
 
Join Date: Jul 2019
City & State: Ontario
My Country: Canada
I'm a: Knowledge Seeker
Posts: 33
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

Here again if I follow the procedure for 7 blinks and because I don't have short and 3 volts on pin 9 of P7, procedure tell me to change the P-Board again... Don't know what to do.
Attached Images
File Type: jpg Screenshot_20190813-112959_Drive.jpg (1.07 MB, 5 views)
autoperformance is offline   Reply With Quote
Old 08-13-2019, 12:35 PM   #20
tvtimmy
Badcaps Veteran
 
tvtimmy's Avatar
 
Join Date: Mar 2015
City & State: milwaukee,wi
My Country: usa
Line Voltage: 120VAC/60HZ
I'm a: Knowledge Seeker
Posts: 789
Default Re: 4 Blinks Panasonic TC-P50G20 Help to target the problem.

It is DEFINITELY a bad sc board. Do some testing on the IBGTs and you will find some shorted ones. There are repair kits that have up to 100 or so components to change. If you miss anything, that board goes up in smoke again. Way too hard for me to attempt a repair on that sc board.
tvtimmy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 10:51 PM.
Did you find this forum helpful?