Panasonic tc-p55gt30 Loud Pop and 7 blinks again

[willythekid415]

Just wanted to say thanks to BadCaps for all the great resources!

My Panasonic tc-p55gt30 had the common 7 blink code. Bought a kit from ShopJimmy via ebay account. Replaced the shorted Transistors and diodes. TV fired right up after replacement. About a month in with mild usage, TV went off with a loud bang while I was watching TV. Reopened the TV up and SC board (TNPA5335) is shorted again on the SC2 connector. Visually inspected and found R5207A (D604?) and R601 completely burnt. Wondering if it was a bad batch of transistors that may have caused this problem?

Following Shorted Components:
Q401
Q402
Q403
Q421
Q422
Q423
D401
D421

R5207A (burnt)
R601 (burnt and OL. Anybody with a schematic to identify its resistance value?)

Thank you for your time!

[tvtimmy]

Re: Panasonic tc-p55gt30 Loud Pop and 7 blinks again

That is a sloppy repair job. Looks like he missed a few of the legs on the igbt's.

[dick_barton]

Re: Panasonic tc-p55gt30 Loud Pop and 7 blinks again

It does look like the soldering unfortunately is probably the cause of your problem.

[budwich]

Re: Panasonic tc-p55gt30 Loud Pop and 7 blinks again

Just wanted to say thanks to BadCaps for all the great resources!

My Panasonic tc-p55gt30 had the common 7 blink code. Bought a kit from ShopJimmy via ebay account. Replaced the shorted Transistors and diodes. TV fired right up after replacement. About a month in with mild usage, TV went off with a loud bang while I was watching TV. Reopened the TV up and SC board (TNPA5335) is shorted again on the SC2 connector. Visually inspected and found R5207A (D604?) and R601 completely burnt. Wondering if it was a bad batch of transistors that may have caused this problem?

Following Shorted Components:
Q401
Q402
Q403
Q421
Q422
Q423
D401
D421

R5207A (burnt)
R601 (burnt and OL. Anybody with a schematic to identify its resistance value?)

Thank you for your time!

I know from limited experience, the "joy" that comes with fixing a board. I hope you are successful. However, I also know from the same experience that "sub standard parts" and "less then perfect solder workmanship" cause problems and it becomes a "vicious circle" as you chase failures. Ultimately, it might be worthwhile to consider a replacement board. There are a number of them available at aliexpress (if you don't have a problem with that sort of thing). They can be had for less than $60 US in a number of cases.
Just a suggestion.

[syaoran123]

Re: Panasonic tc-p55gt30 Loud Pop and 7 blinks again

This post was from last year (?)

Anyway Im interpreting it as he installed a kit purchased from sj (which are inferior quality from my own experience) which then blew out other components. The picture shows the damage that the kit did to the other components. Not his soldering job.

[jostewcrew]

Re: Panasonic tc-p55gt30 Loud Pop and 7 blinks again

panasonics ive worked on that blow power supplies have had a shorted led on a string. same as you, works for a short while then boom. i now check leds by default for varied readings between strings. i would ensure that you dont have a short on any of your leds before fixing the power supply and plugging it in again.