sony problem hb-75p does not start and remains black screen

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By Nprod

Resident (35)

Nprod's picture

14-05-2019, 22:03

I had a black screen issue with an HB-75 and i started by socketing of the BIOS and Personal Databank ROMs and cleaning the traces which had a lot of crusty rosin residue around the pins. After this it booted just fine, so it was probably a bad joint somewhere. I've also seen reports on this forum about traces "rotting" in that area - they would turn black from (possibly) moisture getting under the soldermask layer.

Do all of the RAM ICs get hot or is it just specific ones? Have you tried re-seating the two ROMs (if they're socketed)?

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