I have repaired a Commodore Amiga 2500 (A2000 Motherboard) with Black Screen for a dear friend.
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Defect:
Black Screen.
Diagnosis:
The Battery Acid has corroded a track (not visible to the naked eye) connected to the PIN 10 of the resistor packs RP900 and then the same track is connected to the CPU.
Repair:
I have made a small bridge between the two points on the solder side of the pcb and the problem was fixed in 5 minutes.
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