The Future was 8bit

Commodore 64 mk1 Repair -6

C64 - Fault "Suspect PLA: Blank screen with border and intermittent garbage"

C64 Mk1
 
Yes, it's a mk1.. This is more like it!
 
C64 Mk1
 
Need to take a peek inside before this thing gets any power. Looks like it's NEVER been opened!
 
C64 Mk1
 

This thing list like magic inside!.. No filth, no dust.. First thing I noticed was the layout. PLA and Reg very different

C64 Mk1
 
5v Regulator heatsink. Complex little beast fitted over the joystick ports.
 
C64 Mk1
 
Spotless on this side too :D Time for some power..
 
C64 Mk1
 
Oh.. Booo. Ok, funky stuff..
 
C64 Mk1
 
Wow.. Love it! :D
 
C64 Mk1
 
Super early PLA Lives next to SID.. Gets frigging hot but this is one of the few chips that still work.
 
C64 Mk1
 
Now, things have progressed at little, after changing the VIC-II chip and the Kernel, my diag cart gave me the unwelcome news that the SID as well as both 6526's where knackered. This thing must have been fried by a bad PSU or power surge, or possibly just the old capacitors not doing what they should. Jiffydos fitted rather than a standard C64 kernel.
 
C64 Mk1
 
Yep, five dead chips.. Real shame about the original Vic-II 6569
 
C64 Mk1
 
You don't change all these chips without fitting new capacitors. Caps changed and PCB cleaned. Spotless! ;D
 
C64 Mk1
 
Looking good.. Some heatsinks and a JiffyDos switch is all it needs now..
 
C64 Mk1
 
Neat switch'ness.. Slide switch fitted into the RF select gap. I wasn't about to drill a hole in a mk1.. No a friggin chance!
 
C64 Mk1
 
Heatsinks added to hot stuffs.. Time to put her back together.
 
C64 Mk1
 
 Quick clean and it's time to send her home to her owner.. He had this one from new.. Well worth saving.. I even sent the chappy the old faulty parts so he could at least in some way keep it orginal. C64 mk1 now added to my WANT list!