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Dear Valentin,
                     Thankx a lot, for You effort!
IT was succesfull! So sucessfull that the even the chassis number was the same, with some very little difference on only few components. All numbering was the very same, and the repair was very, very, easy, less than 2 hours, including Tv cleanning, isolating HV, and reassembling.I don't know if you are interested, but the fault on this set was caused by several HV spikes on the CRT plug. After that, the image goes dark (no image seen on screen), and sound ok. Adjusting the Screen potentiometer on HVT a little the image appear but very dark. The fault was a short on C604, 47nf 100v, just above the HVT on schematic, it shorts the ground to what they called AQUA signal. This caused a low level signal sent to pin 22 of TDA8843 and Screen light simply gone. Replaced by 47nf but 400volt part, not 100v. Some isolating grease was used at CRT HV plug, to avoid HV spikes. 
Best Regards
    Albano  albano.matos@netvisao.pt

 

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