Some WARNINGS before you start to fix your own PSU: If you have no experiences with repairs like this DON’T DO IT! If you try to fix it, it is at your own risk! Beware of the HIGH 300V+ (DC) voltages!! Beware that some capacitors can hold high voltages for some while, unload them with […]
Category: bL0g
Videopac G7200 – display not good and no audio
Got a Videopac G7200 on my bench. problems: Display shows horizontal bar No audio Power switch broken Display This is what the display is showing. \ Problem: Vertical Deflection is not good, good chance that a few capacitors are worn out. Lets have a look on the schematic: C51 must be 100uF, reads 62,77uF. Replaced […]
CD32 – No composite and glitchy afterwards
CD32 came in for repair, has been recapped for 4-5 years ago. No composite signal and S-Video totally distorted. Checked the signal on the CXA1145, they looked good, also check signals from CXA to connectors, everything looks good. But still no composite and distorted s-video. I decided to replace the CXA1145, delayline, band filter. […]
Amiga CD32 S-Video no colour
I got an Amiga CD32 without colour on the S-Video output on my work bench. Schematic of S-Video ouput. I tested input signal (Base) of the Q282 2N3904 (NPN) transistor, result is ok (see picture above). Ouput signal: That’s not what it should be, so replaced transistor Q282, result after replacement is still the same. […]
Amiga 4000 RTC not found
Sometime a RTC doesn’t work on an Amiga 4000. It can be a trace or via, but if they are all connected and test good the most common issue with this is a “floating” ground (pin 8) of U177. Or the RP5C01 RTC chip is dead 🙂 If we check the ground pin we see a […]