little sony dim picture

[DaveWM]

model TV-770

[ctc17]

Im going to email you the sams on it, its going to blow your mind
The filament IS the cathode and it uses a little isolation transformer that looks like it may apply the horz/vert blanking too.
I see a 1uf boost filter cap that could cause low boost/low G2

It is a unique design thats for sure. There are disassembly instructions in here.

[DaveWM]

looking at the schematic now, I also see a coupling cap on the base of the video out transistor that if leaky could f up the bias.

[ctc17]

I rescanned it at 300dpi, the first one sucked.
Would you have figure out how to get that apart??? Be honest....

[DaveWM]

another odd thing the contrast pot does not do much except at the extreme end so I will look at the 100uf emitter bypass cap as well. I also see a voltage divider used for the base bias, if that 9100 ohm resistor went high then the bias would be fouled up as well. think I will check C501/C503 and the C505/C508 (boost filter on the brightness you mentioned). Will also get voltage readings on that transistor and the CRT pin 1 and the anode.

[DaveWM]

I prob would have missed the ones referenced to by removing the smoked screen cover of the CRT..