SuperSprint
Well-known member
My 19K4915 chassis (Super Sprint - Atari) died after many years of fun. I've got a basic electronics background, but no practical experience with monitor repair. I'm hoping some of you vets will be willing to lend some sage guidance about how best to proceed.
Problem: Sudden failure. No picture. Game still playing "in the blind".
Testing: No neck glow. HOT (Q352) has low impedance to ground. 3.3ohm resistor in primary voltage circuit (R601) tests open. Some signs of cold solder, but continuity tests to far points suggest they are good. back right of PCB shows some signs of darkening/cooking, but no obviously burnt components.
Notes: The flyback looks good (no cracks or burns), but when I took it to a tech several years ago he diagnosed it as a bad flyback and said I needed a new monitor. He may be correct, but I felt "dismissed". Having since read that flyback failures are rare in this monitor, I'm unsure of this diagnosis.
What I have: Cap Kit, schematic, PCB prints, solder iron, DVM, Fromm flow chart.
What I *think* needs to be done: Replace R601, Q352, all electrolytics, pray.
Anything else I should consider before digging in?
Problem: Sudden failure. No picture. Game still playing "in the blind".
Testing: No neck glow. HOT (Q352) has low impedance to ground. 3.3ohm resistor in primary voltage circuit (R601) tests open. Some signs of cold solder, but continuity tests to far points suggest they are good. back right of PCB shows some signs of darkening/cooking, but no obviously burnt components.
Notes: The flyback looks good (no cracks or burns), but when I took it to a tech several years ago he diagnosed it as a bad flyback and said I needed a new monitor. He may be correct, but I felt "dismissed". Having since read that flyback failures are rare in this monitor, I'm unsure of this diagnosis.
What I have: Cap Kit, schematic, PCB prints, solder iron, DVM, Fromm flow chart.
What I *think* needs to be done: Replace R601, Q352, all electrolytics, pray.
Anything else I should consider before digging in?