Panasonic TC-P50G15 Power-on Issue

[davidj488]

Recently fixed my TC-P50G15 Panasonic Plasma, thought I'd share the experience. I'm not a tech, just someone who knows basic electronics and how to use a multi-meter and not fry myself (surprisingly).

Symptom - set gradually started having power-on issues. Symptom would be a single flash of the power LED at 3-second periodicity. At first, it would happen maybe one in 10 times, then 30% of the time, then 50%, then 90% - when the set became effectively unusable.

Suspected P-board, but after replacing with a refurb, the exact same symptom persisted. I checked all test voltages, everything looking good (with original P-Board and the replacement).

Checked all cables, etc., tried cooling components with dust-off propellant - didn't reveal any obvious candidate bad-caps on any board.

Finally decided the most likely culprit as the A-Board (main board), though the service manual () listed a number of boards as suspect with that power LED signal, but couldn't find a bad cap or consistent change in symptoms when super-cooling components.

Found another helpful post on badcaps forums where a poster suggested they had sent theirs in for a repair to ModusLink PTS. Found my board here: http://www.moduslinkptstvboards.com/TXNA1FFUUS/

ModusLink quickly turned around the repair (or maybe they sent me a refurb? I failed to mark the board before sending).

Now when I first installed the new board, I was getting a new/different symptom - a six blink on power-on and the relay clicking off as before! uh oh, something not right. Jiggled all the cables I had disconnected in the power of t-shooting, made sure everything was seated. Ahhh, now normal power-on. But ruh roh, now we have a whole vertical section of screen not working! WTF. Well, apparently in all my tweaking I had loosened a ribbon cable. Checked and re-did all relevant connectors, and voila. I now have a perfectly working set.

Thank you ModusLink PTS! I really like this plasma unit (though power usage is atrocious) and don't like the current LED sets, so very happy to have gotten this repair done and now have a set that powers on normally. Been about a month - working well.

Hope that helps someone else out there.

[davidj488]

Re: Panasonic TC-P50G15 Power-on Issue

service manual for TC-P50G15, which I found useful:

http://www.scribd.com/doc/195854946/...-P50G15#scribd

[tw2005]

Re: Panasonic TC-P50G15 Power-on Issue

Sounds like you had a 1 blink SOS which is A-board. have had someone mention bad smd caps causing 1 blink on boards of this era. Not sure if that was the case with yours but 1 blink is just about always A-board issue

[tommy boy]

Re: Panasonic TC-P50G15 Power-on Issue

same problem here.........single red light every 3 seconds......p/s board swap made no difference.....sent out A board for rebuild and now powers up but have vertical transparent line (3 inch or so wide) just left of center........?? I was thinking c2 board so I just ordered a good used 1 up ($18.00) and was hoping it will work. will be here in two days.........have tried re seating cables with no luck, but will try again.

[tommy boy]

Re: Panasonic TC-P50G15 Power-on Issue

here is a picture. BTW, this a TC-P54S1

[tommy boy]

Re: Panasonic TC-P50G15 Power-on Issue

FIXED!!!!! I had just had the A board rebuilt to remedy a power on problem that was taking longer and longer....so I concentrated on the 3 ribbons that attach at main board. used wife's fine make up brush to clean 1st large connection and wiped ribbon. had to repeat this as I saw improvement! after 1 more attempt, perfect! ended up being this 1st large ribbon that attached at buffer c2 where the corresponding vertical lines on screen were...the ribbon was seated correctly but was not apparently clean?...anyway, my 54 inch 2009 plasma is back on line with a beautiful picture!!! thanks david for this thread!.