SVI-738 rapairs

By LS120

Expert (94)

LS120's picture

24-05-2017, 09:53

anyone interested in helping me diagnose and i hope repair some svi-738's i have.. if so please message me as it will be easier to do via email/msg

thanks

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By hamlet

Scribe (2353)

hamlet's picture

24-05-2017, 10:24

I´m sure you get help here, but it would be great to see the conversation here in the forum, so others with similiar problems can take profit in the future.
Can you describe the failures of your 738s?

By LS120

Expert (94)

LS120's picture

26-05-2017, 11:38

the 2 i have are power on with power led and caps lock on( wont go off) 1 was upgraded to msx2 and was working the other ia msx1 with the same problem.. have recapped both boards and psu. power levels are ok and all chip are getting 5v.. i have replaced the Vram, vdp, and roms (all 3) they were doing the same before recap. the msx2 i have tryed a sunrise cf/ide cart and nothing. when it boots the screen goes black and nothing else.

i'm waiting on a scope to go on from here... Smile

if anyone has a copy of the svi diag cart that may help out...

By Alexey

Guardian (2231)

Alexey's picture

26-05-2017, 12:16

Sounds like a RAM problem. Try a memory mapper cartridge and see if the machine boots to Basic. Does any game cartridge work?

By LS120

Expert (94)

LS120's picture

27-05-2017, 10:24

Dont have any game carts.. been thinking i need to buy one to try..
oO

By LS120

Expert (94)

LS120's picture

17-06-2017, 07:10

ok some more info.. i tried a cart i found and ti's still no go i even replaced the 64kb ram.. i did notice that when i had the cart in and powered on the caps led went out but still nothing..

will get chance this week to try the scope.