I'm waiting on some parts to arrive for essential maintenance but thought I'd drop a quick post in here describing the symptoms and stuff I've done so far to see if it is indeed a Noob caused problem that could be resolved easily.
Symptom :-
The system is connected to my old CRT TV via a Monitor to Scart lead designed for an ST.
- When powered on, the small green light bottom left of keyboard comes on.
- The TV recognises that the Atari is turned on and switches to the right SCART socket.
- The screen is black. Nothing else happens.
- If I stick a disc in the drive, the drive spins but nothing further.
- No flashing yellow LED on the keyboard.
- The C025913-38 chip (DMA) gets HOT. Too hot to hold my finger on after a minute or so.
- Reseated all socketed chips and given the legs and socket a wipe with Isopropyl Alcohol.
- Replaced all electrolytics on the main board (apart from the modulator section.. I assumed as I'm not using it, it won't matter but maybe it is still live and causing an issue).
- Replaced the caps in my power supply. When plugged in and powered on, the PS is giving 4.9V and 12.1V and looks stable on a multimeter, but not scoped it yet.
It's a c070789-001 rev c1 main board.
Any tips or suggested tests will be gratefully received
Cheers
Nick