techknight
Well-known member
I got a powerbook G3 lombard here, and its dead as dead can be dead.....
Here was the issue. some kind of liquid was spilled in it, and immidiately he pulled the power and battery out and left it alone. I tried to clean everything up, disassembled everything, and it seemed ok. the keyboard mostly soaked it up, but some got to the system board. not much. but it is cleaned out now.
I tried to power it up, and all it was doing was pulsating. the green light on the front was pulsing, and i seen the backlight pulse away.... So, i quickly figured out there was a failure in the PMU unit.
Found and replaced a blown international rectifier 934 MOSFET switch. everything else seemed ok, so i replaced it. The machien no longer pulsates, as soon as the power adapter is plugged in, the green light comes on. no LCD, no backlight, no bong. just a spinning hard drive and green LED. I removed the pram batt, removed the main batt, whcih only has 1 light and its flashing, so batt is low. and removed AC adapter.
Put just the battery in, with no PRAM batt and no AC adapt, same thing. goes streight to green light, power button does nothing. I tried pressing reset in the back, the green light flashes once and goes out. wait a little bit, press power, nothing happens. if i press reset again, the green light comes back on, hard drive starts spinning and stuff again. still, no bong and no nothing.... all circuit boards are clean and free of any liquid and corrosion/oxidation. Also if i leave the machine sit for awhile with the green LED on, the motherboard starts to heat up pretty good. the ram gets pretty warm to the touch and quite a few other components start getting pretty warm. tested RAM in my ibook 900 and its good.
Any ideas?
Here was the issue. some kind of liquid was spilled in it, and immidiately he pulled the power and battery out and left it alone. I tried to clean everything up, disassembled everything, and it seemed ok. the keyboard mostly soaked it up, but some got to the system board. not much. but it is cleaned out now.
I tried to power it up, and all it was doing was pulsating. the green light on the front was pulsing, and i seen the backlight pulse away.... So, i quickly figured out there was a failure in the PMU unit.
Found and replaced a blown international rectifier 934 MOSFET switch. everything else seemed ok, so i replaced it. The machien no longer pulsates, as soon as the power adapter is plugged in, the green light comes on. no LCD, no backlight, no bong. just a spinning hard drive and green LED. I removed the pram batt, removed the main batt, whcih only has 1 light and its flashing, so batt is low. and removed AC adapter.
Put just the battery in, with no PRAM batt and no AC adapt, same thing. goes streight to green light, power button does nothing. I tried pressing reset in the back, the green light flashes once and goes out. wait a little bit, press power, nothing happens. if i press reset again, the green light comes back on, hard drive starts spinning and stuff again. still, no bong and no nothing.... all circuit boards are clean and free of any liquid and corrosion/oxidation. Also if i leave the machine sit for awhile with the green LED on, the motherboard starts to heat up pretty good. the ram gets pretty warm to the touch and quite a few other components start getting pretty warm. tested RAM in my ibook 900 and its good.
Any ideas?
