Sony multisystem KV k29MF1 to rescue

[Benyamin39]

Hi Zeno,

I have adjusted up the G-2 as per your instruction (got the retrace line, and backed off). It is all good on this one and I actually the voltage on the cathode is now close to what the service manual was requiring (185V). So I have cleared this one.

Also to clear any uncertainty I also replaced one the neck board transistor driving on the green line. Voltage on the green cathode is now close to other color values (when no input signal, ie black screen)

I adjusted the white balance and I see some slight improvement. White is getting closer to true white without me having to go all the way up on the green and blue drive settings.

I adjusted convergence (yoke tilt to align left/right, top bottom and then I adjusted and added convergence strips) and I got satisfying results now. I should get across the line on convergence and geometry issues also.

Overall the picture is ok, still on the slight pinkish tones thought.

The remaining issue is that the picture is actually rather dim. In retrospective and after having done all those adjustments I realize that I could have figured out the dim screen symptom right from the beginning.

I run the greyscale picture test and the color does not change when the TV is warming up. No afterglow either.

I did some research and I wonder whether the emission gun is getting weaker. Am I correct? I don't think I have a chance to find a replacement tube for this TV (29in, likely from Europe?), so I am thinking of boosting the heater a bit by lowering R705 and R706 (2 5.6-ohm resistors in parallel) or find someone doing rejuvenation in Toronto area? Do I have any other option?

Thx