Its definitely Possible! I have a 50" set that's given me headaches with a buggered 5105 for a while. A few days ago, I got in a 42" set TX-42S20B that had a cracked PDP, but its TNPA5105 checked without shorts....
Decided--What the hell, Change over, make it compatible. Checked over the boards, the same devices used in each and every place heatsink semi wise, so the ERC parts changed over along with the third VSUS Decoupling-Cap that the the 50" board uses.
The ERC Circuits have different time-constants and capacity due to the larger PDP capacitance of the 50" screen so these parts needed changing over.
To do this, the Coils and Capacitors of the ERC circuit need to be changed over, the extra electrolytic 200uF 220V added from the 50" board (AB) to the 42" (AD) boards.
The 42" has only two large blue film caps in the ERC, the 50" (AB) has three.
--I noticed the AB board (50") the caps were same value--but physically smaller for some reason.
--I changed all three into from the AB into the AD board.
The Inductors and their placement are also different, the 42 (AD) has ones marked 1, while the 50 (AB) has ones marked .8 I assume this is uH....
I followed the placement of the inductors duplicating into the 42" AD from the 50 inch board.
Board fitted to the 50" and fired up with The Bulb in series with VSUS supply(150W 240V globe-lamp)
Set ran and bulb glowed slightly, brightening somewhat with picture brightness increase that lead to the VSUS collapsing somewhat and giving a rather pinkish mal-discharge picture.
I tuned in the DTV, set continued to work--Went to make a cuppa--set still on when I returned, nothing got overly hot, so removed The Bulb and soldered the connections direct from PSU to SC.
The set has now run well for a few days. Only observation I made was that I had forgotten Just How HOT these SC run because of their tiny heatsinks...
Decided--What the hell, Change over, make it compatible. Checked over the boards, the same devices used in each and every place heatsink semi wise, so the ERC parts changed over along with the third VSUS Decoupling-Cap that the the 50" board uses.
The ERC Circuits have different time-constants and capacity due to the larger PDP capacitance of the 50" screen so these parts needed changing over.
To do this, the Coils and Capacitors of the ERC circuit need to be changed over, the extra electrolytic 200uF 220V added from the 50" board (AB) to the 42" (AD) boards.
The 42" has only two large blue film caps in the ERC, the 50" (AB) has three.
--I noticed the AB board (50") the caps were same value--but physically smaller for some reason.
--I changed all three into from the AB into the AD board.
The Inductors and their placement are also different, the 42 (AD) has ones marked 1, while the 50 (AB) has ones marked .8 I assume this is uH....
I followed the placement of the inductors duplicating into the 42" AD from the 50 inch board.
Board fitted to the 50" and fired up with The Bulb in series with VSUS supply(150W 240V globe-lamp)
Set ran and bulb glowed slightly, brightening somewhat with picture brightness increase that lead to the VSUS collapsing somewhat and giving a rather pinkish mal-discharge picture.
I tuned in the DTV, set continued to work--Went to make a cuppa--set still on when I returned, nothing got overly hot, so removed The Bulb and soldered the connections direct from PSU to SC.
The set has now run well for a few days. Only observation I made was that I had forgotten Just How HOT these SC run because of their tiny heatsinks...
