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Cool I wanted to do the same thing with the board.I havent had time to try it, but here it goes. The schematic can be found here. The file is named Philips-GR9D.rar and is a pdf ~ 44mb for the whole schematic for the tv. Check around page 40 or so for the schematic. Its in another language though. Seems you should only need 12v (regulated) and a variable audio level seeing the amp looks at a fixed level. Connector 1401 (1-5)
Right Channel Input
Left channel input
Connector 1449 (1-5)
Right channel out
KEY (No pin)
Left channel out
Connector 1418 looks to be an extension of 1449 and from what i can tell the lower "divided" part of the board (eg the high voltage side from connector 1400 to the transformer) appear to be power for the audio circuit derived from around the fly back area of the tv. (around 160v i presume). In other words I think you only need connector 1401 and 1449. The only other thing seems to be that it cannot be bridged (for subwoofer use) as is (sharing a common ground on the output). Wish you well.
If you are looking for a schematic, I am sorry, but there aren't any. I I have been studying these amps for years, and PPI holds that info very close to chest. It is possible to work on the amps without one though, if you are familiar enough with them. What kind of problem are you having? I have fixed many of them in the past, maybe I can point you in the right direction.
studying the radio schematics , i'm seeing a radio amp fuse under the hood ,in the main fuse box under hood , 30 amp , check that for starters , if the amp was out you would only lose sound , would like to get a fix ya vote , comment back because i have other thoughts on your schematics , and do you know if its the base model or premium sound , with or without cd ? , thanks .