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The board is clean and has been recapped. I already replaced all the SMD video chips (F253, LS166, and LS393), but no luck. The picture is from an SE/30 listed on eBay, which has the exact same issue. Any idea? To me, the video circuitry doesn’t seem to be fully initialized. I haven’t probed...

Hi everyone, I’m experiencing a strange issue with my PowerBook 165. The machine boots and works perfectly, the screen comes on with proper contrast and image… but the backlight shuts off after about 5 seconds. The image remains visible under strong light, so the LCD itself is fine — it’s...

Hi everyone, I’m currently working on three different PowerBook 2400c units, and they’re all exhibiting the same strange behavior: I have to plug and unplug the AC adapter 5 to 10 times before the machine finally gives the startup chime and powers on. Once they chime, they boot and work fine...

Hi everyone, I’m looking for a Motorola MC68851 PMMU chip to upgrade my Macintosh II. The machine currently runs with a 68020 and I’d like to enable full virtual memory support, ideally to run A/UX or other OSes requiring a PMMU. If you have a working MC68851 (preferably tested or NOS), or a...

I recently bought a battery bombed SE/30, originally just to salvage some components from the logic board. However, the damage wasn’t too severe, so I decided to try repairing the board. I replaced five F258D chips with new ones, and there are no visibly broken traces. I also washed the board...

I was recently given a non-working Macintosh II power supply to repair and use with my Macintosh II board. Someone already recapped it correctly, and every capacitor has the correct value. It tries to start but immediately shuts off, and the fan doesn’t turn on. When I keep holding the power...

I was given a broken Macintosh IIfx motherboard from Maxwell battery leakage. Only one of the battery leaked, and not any IC were damage (I think). The most of the damage on the interrupt and reset switches. I cleaned the motherboard in IPA several times, I reflowed the legs of the IC’s...

Hi everyone, For the past few days, my SE/30 hasn’t been displaying anything on the screen. I completely cleaned the motherboard with isopropyl alcohol and replaced the capacitors. It still boots and plays the startup chime, but nothing shows on the screen. I’m fairly certain the issue is...