Solder
Member
MK4 board - powers up, gives a grey flashing screen ('DIAG' LED flashes in time with the screen flashing. Sometimes the screen is simply a steady grey. PWR, I/O and Sound LEDs are on steady).
Sometimes the screen will flash Purple (just for one flash).
The surface mounted LS07 near the edge connector had burned out - replaced it but no good, not even any video sync going into this chip. Can't seem to see where the vid sync comes from - anyone got any ideas please? Am wondering if whatever fried the LS07 has fried whatever is generating the sync (etc).
No other signs of physical damage.
No sign of any lifted pins. Board in good physical condition.
EPROMs are fine (U10 was corrupted but now replaced).
Board is running rev 3.0 of the code.
Any thoughts please?
Sometimes the screen will flash Purple (just for one flash).
The surface mounted LS07 near the edge connector had burned out - replaced it but no good, not even any video sync going into this chip. Can't seem to see where the vid sync comes from - anyone got any ideas please? Am wondering if whatever fried the LS07 has fried whatever is generating the sync (etc).
No other signs of physical damage.
No sign of any lifted pins. Board in good physical condition.
EPROMs are fine (U10 was corrupted but now replaced).
Board is running rev 3.0 of the code.
Any thoughts please?
