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Morzana

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Apr 11, 2016
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France
Any idea ? Sync adjusted ;)

bb-tad.jpg
 
does the board have a group of 74ls161's ??
 
Cold solders on SMD chips?
Failing RAM on address lines (giving a repeated pattern)?
 
Cold solders on SMD chips?
Failing RAM on address lines (giving a repeated pattern)?
Reflow GFX SMD Chip (in green)
- SEI0210 custom (128 pin PQFP)
- SEI0220BP custom (80 pin PQFP)
- SEI0200 custom (100 pin PQFP)
- SEI0160 custom (60 pin PQFP)

Activity on GFX Ram are ok with logic probe (in red)
HM6265

I will see with an oscilloscope for weird signal

Eventually, I will desolder the rams and test them with eprom programmer

bb-pcb-reflow-ram.jpg
 
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