2 x Commodore 128 Repair
Clicca per ingrandire l’immagine
I have repaired last year these computers for a dear friend.
Commodore 128 #1
Defect:
- Black Screen.
- Missing CAS on PIN 1-4 of the 74LS32 (U9)
- Missing CHROMA video.
Fix:
- To fix the problem of lack CAS on 74LS32 i had to make a bridge from the PIN 41 of the PLA 8721 because a pcb track under the socket was interrupted.
- Broken solder joints on the RF Modulator.
Commodore 128 #2
Defect:
- Black Screen but sometimes it works.
Replaced parts:
- Replaced the socket of the 8721 PLA.
- Replaced 8721 PLA (U11).
Note:
The main problem was the PLA. In the C128 mode sometimes works and sometimes not. Works always C64 mode.
Categories: Projects / Repairs, Today, Various
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