Troubleshooting PowerBook 3400c

[coius]

I just got a PowerBook 3400c off of a member here and when I get it, it will not turn on. I have done dang-near everything I can do to get it working. So far I have done this:

Tested and made sure power adapter puts out 24v

pulled battery (mains) and tried it, ditto with PRAM both on/off the board.

I can get the green LED at the top to stay solid on, or turn off when I hit the reset button at the back by the SCSI port.

Keyboard power button does NOTHING.

I can hear a slight "pop/click" coming from the speakers in the lid. there is no hard drive spin up. I have also tried it with the minimal config, no extra RAM, reseated the power board.

I am unsure, but it seems like the metal can/capacitor on the power board by the trackpad has a slight bulge. it's not very domed, but there is a slight. no leakage though. Not sure what it should look like, but the dome is so slight it could be just a defect in making the cap.

I tried holding down the reset button for 30 seconds.

does the PRAM battery need to be charged to make this work? I have heard conflicting reports between MUST have PRAM, vs. works better with no PRAM than dead PRAM.

it sure seems that this is along the lines of the GLoD that I have heard. I have worked with another 3400c (which my friend has now) but never had this issue.

Btw, did a check, the battery leads that go to the battery to charge it is only putting out 2 volts. is this acceptable without the machine having load/being on? does the machine need to be on to charge the battery? the battery is completely dead. so I will try leaving it plugged in and see what it does, but I could use a bit of help. Kind of rusty with this stuff...

 

[techknight]

sounds like what my lombard did. turned out to be a bad proc card, which in my case a reflow fixed it. but in your case, you could possibly need a new one.

 

[theos911]

My Duo 2300c does this quite regular. I fix it by: A. Unplugging and replugging several times until it (usually) works or B. Pop off the keyboard, disconnect the PRAM for a moment, and then reconnect it; or sometimes boot without it. I eventually plan on buying a new PRAM battery.

 

[coius]

Turns out the motherboard is shot. I swapped parts and the only thing I didn't swap was the motherboard. I have a WTB/WTT up on the trading post. someone on #applefritter suggested the processor is shot. I am hearing a whistling sound coming from the board when it's plugged in and the green LED on the lid is on. it sounds like component failure. I see one Capacitor, but it's not leaking, nor bulging. I am not sure what's going on, but the whistling is coming from around the CPU.

I will have to find a new board. Anyone got a spare, I am open for trades