Audio , no video

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By somacast

Resident (34)

somacast's picture

18-05-2021, 23:38

somacast wrote:

hi ,

aside from my previous unanswered topic , i tried to grap a used motherboard for my problematic A370 (MSX2) Arabic version.

the new board has no video out , only audio , any clues please?

also wanted to ask about some keyboard buttons not working ( 2 , esc , e , u ) , doesn't seem like contacts of keyboard issue, what could be in motherboard?

thnx

and now i have noticed something funny on my previous bad motherboard, it shows 64k video ram only instead of 128 !! so i guess that not only vdp could be bad but 2 of the video ram chips are and caused that display issue..

but coming back to this board, i tried the mc1377p from the other board which works,no use, installed this there , it works , so it wasn't mc1377p after all

tested most of components.. still trying to find out the real cause Smile

By somacast

Resident (34)

somacast's picture

19-05-2021, 13:11

i was also wondering..

RGB works fine, and it uses ( I believe) the same C-sync used for video out as well, which means its very unlikely that an IC is not functioning, and its rather just a tiny hidden resistor acting funny or disconnected... ????

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