Re: Question about Sharp LC-46D85UN Power Supply

Did replacing C7816 fix the problem of set having no power?

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted



The board # is 5335BK TNPA5335 MOD# TC-P55GT30...

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted



Replaced Q661 and Q600 and fired up SC with SC50 shorted hear a short buzz with green LED coming ON and then OFF and both Q661 and Q600 shorted.
Any Idea as to what other component may be at fault? I've all other IGBT's and diodes and they are all fine no shorts. I am suspecting a bad IC921 (IGBT Controler) Pin 23 and 24 control the gate of Q661. Any help would be great!...

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted



Update:
I finally got the RJP63G4 IGBT's and replaced, fired up the SC board with SC50 jumpered and once again fired up for a seconds and died with 7 blinks. This time I found the replaced Q661 RJP64G4 shorted and also found Q600 C08N25 shorted (between D and S). I have ordered C08N25 MOS FET and once I get it will test it and hoping it will work.

I Checked all gate resistors and all of them check out fine.
I checked measured all other IGBT's and no shorts....

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Sorry I meant the SC card and not SS.

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Update! I found one more IGBT shorted on the SS card after I wrote my last post, Q661 (RJP63G4). I have ordered it off eBay and waiting for the part to arrive. Will give you an you update once I receive the part.

Re: Panasonic Plasma TC-P50GT30 7 blinks SC board shorted

Hi,
I am working on TC-55GT30 SC card with 7 blinks (caused by loose mounting screws on the board). Found 3 shorted IGBTs (30F131) Q621,622,623 replaced with new ones, did a resistance check on all remaining 30F131 and got a consistent reading of 47Kohm across pins 1 and 3(G&E) all gate resistors for IGBT's measured fine. Checked all diodes for shorts and none found. I installed the board back into the unit with only SC 02 and the ribbon cable connected and all connectors to SU-SD boards disconnected with connector...