Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
You were absolutely right. It does seem to be the SC board and Q661 seems to be shorted out. I'l start looking around for a replacement. Is it difficult to swap out this board? Looks like some jumpers to the SM board. Also, once the SC is replaced, do you update the firmware using an internet connection to the TV and using the TV's built in firmware update software or must one get firmware on a flash drive from Panasonic?
Hope you will consider sending me your mailing address via email (pfarmer@emory.edu)....
FARM60
Sheldon_Clone
Last Activity: 09-08-2014, 06:10 PM
Joined: 12-25-2013
Location: Kennesaw, Georgia
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Thank you for the expert feedback. I'll perform the suggested testing in the morning.Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Keep forgetting. The resistance across SC2 was ~ 4 megohms.Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Will start looking into repairing or replacing the P board, but will be looking for any advice prior to this move.Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Oh yes, I disconnected both SC2 and SC20 going to the SC board. Turning on TV causes change from SOS4 to SOS6. Reconnected the SC20 ribbon cable only and now TV goes to SOS7. I suspect this is what is expected if the SC board is working properly. I wasn't sure how to test resistance on the buffer boards per your prior advice.Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Thanks tw2005 for your prior help. I had to drop troubleshooting for awhile owing to caring for 91 year old mom having Alzheimer's dementia. Here's the latest. I bought a DVM instead of using an old analog VOM to get a better reading on voltages. Since the current problem is SOS4, I first checked for shorts on P11 and P35. All good! Next checked 4 blink failure (slide 27). Definitely have 3V at pin 9 suggesting replacement of P board. Since P board is upstream from other boards, does it not make sense to replace it...Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
One last clue from slide 51. When rechecking voltage, I see 15 volts briefly after first relay clicks on, but no voltage on pin 7 of P6 after 2nd relay clicks on. Also TV fails to come on during last test on page. Should voltage of 15V persist on pin 7 after second relay is activated?Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
Also checked slide 16 which ends by indicating problem might be C1 board or panel. Not sure how to go any further by isolating panel from C1 board as suggested. Boy, this is not straightforward for troubleshooting.Leave a comment:
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Re: Panasonic TC-P50GT25 Power Indicator blinks 4 then 10 times
My P50GT25 also just died after wty ended. Not sure about initial blinking pattern, but settled into 10 blinks. Resistances at P11 Wh, P11 Brn, and P35 Wh was 1, 1.5, and 0.8 ohms (slide 8). Suggested Vda issue if < 1K ohm and a possible C board or panel issue. Next checked slide 12 resistances which suggested bad SS board. Finally slide 14 results suggested an SC board. Do have 15V on PS. Since conflicting results, plugged TV in and turned it on. Now 4 blink pattern. Not sure how to proceed. No obvious problems...Leave a comment:
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Re: New Members - please post your introductions here
Hi everyone. I am new to this site and need help diagnosing a bad board in a Panasonic TC-P50GT25 plasma TV. Am fairly proficient at troubleshooting. Can't find any obviously bad capacitors. Don't want to replace the P (power supply) board only to find out another board is shorting out the power supply. Can't find a source to know what voltages to look for on the P board. Will search threads for help. Thanks in advance!!!Leave a comment:
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