Covert Panasonic Plasma TNPH0831 "A" board into AB variant

[mattaw]

Good morning,

I have a perfect 2010 Panasonic TC-P46S2 FHD plasma TV, short only a working A board.

1) Got hard to turn on, requiring unplugging and waiting 30s.
2) Currently on clicking the power button, relay click for about 4s, then clicks off. One slow constant red blink (3s?)

I interpret that as a failed A board, however the TNPH0831AB is unfortunately completely out of stock everywhere and has been for years.

DMM'ing about seems to show the power supplies as good, the power supplies on the board OK and no shorted SMT ceramics or blown electrolytic caps.

There are a lot of other variants of the TNPH0831 about, and I am planning to get one of the TC-P50S2 variants (larger screen, same panel and feature set).

Looks like its identical from the service manuals except for the EEPROM + FLASH chips. I can solder them across.

Any advice? I found this thread already which suggests this method from tw2005 here:

These are the ICs I'm talking about

Ic8004 tvrr188aas ic 46s2, 8 pin $6.45

ic8502 tvrr166ags ic tcp42u2,tcp46s2,tcp50s2,tcp54s2 This is good, the 56pin is the same, that leaves just the easy ones to swap!

Note 58" is different

ic8503 tvrr168aas ic 46s2, 8 pin $10.04

ic9001 tvrr208abs ic 46s2, 8 pin $6.64

ic9304 tvrr216abs 46s2, 8 pin $8.64

None of the other ICs are unique to the 46S2 on that board.