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HX-10 black screen/no composite

Por Preppie

Supporter (3)

Imagen del Preppie

16-10-2022, 18:44

I have a UK Sony MSX HX-10 that gives a black screen through RF (usualy with a lot of interferance) and I get no signal via composite.

Power light is lit, and caps lock light works.

I've swapped out the 4 socketed chips with known good ones, but no difference.

Any ideas where I should start looking?

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Por CASDuino

Champion (330)

Imagen del CASDuino

16-10-2022, 20:48

I would look at the breakout board for the video signal and the LVA510. Hard to get a hold of though. Also the 74LS04 which is a lot easier to get a hold of. The fact you're getting the interference tells me the RF is working but it's probably not getting a signal from the EMC - PB3605

Por Preppie

Supporter (3)

Imagen del Preppie

16-10-2022, 21:22

Thanks, looks like a good place to start.

Por Preppie

Supporter (3)

Imagen del Preppie

16-10-2022, 23:31

Swapped the breakout board with another machine and everything worked fine - many thanks.

Caps and soldering look fine on the breakout board so I'm guessing I need to source a couple of LVA510