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| PowerBook 145b |
Posted by: Louie on 2022-09-18 06:34:49
Does anyone have a diagram of what each item on the PowerBook 145b's motherboard is? I recently purchased one that was in "good condition" but untested. The motherboard looks clean and there is no corrosion however it doesn't turn on. |
Posted by: 3lectr1cPPC on 2022-09-18 16:58:03
Are you using a known-good charger? The originals almost always go bad due to bad capacitors. |
Posted by: Louie on 2022-09-18 17:14:41
Are you using a known-good charger? The originals almost always go bad due to bad capacitors. I have a "replacement" that puts out 7.5v, which is brand new. |
Posted by: 3lectr1cPPC on 2022-09-18 17:18:50
Alright then. So, nothing when power is pressed? Disconnect all non-essential parts. If any keys are stuck on on the keyboard it won't start for whatever reason. If it has a hard drive then you can use that as a test to see if it starts with the top case off I'd assume. I don't think there are schematics for the motherboard unfortunately, but you can test to see if any tantalum/ceramic caps have shorted. |
Posted by: xreactx on 2022-09-18 20:59:25
Alright then. So, nothing when power is pressed? Disconnect all non-essential parts. If any keys are stuck on on the keyboard it won't start for whatever reason. If it has a hard drive then you can use that as a test to see if it starts with the top case off I'd assume. I don't think there are schematics for the motherboard unfortunately, but you can test to see if any tantalum/ceramic caps have shorted. Any damaged connectors? |
Posted by: 3lectr1cPPC on 2022-09-19 04:25:55
The power button and power jack are directly soldered to the logic board. As long as the hard drive cable isn’t damaged, you should at least hear the drive spin up.
Oh, and also, check the SMD fuses. I’ve heard of them being blown before. Not sure exactly where they are on the logic board though, there’s a thread somewhere on it. |
Posted by: pezter22 on 2022-11-25 06:09:18
I just finished repairing several PowerBooks 180,170, 165 and now working on a 145 all with no power issues. I found that they all are similar. Remove the board. Either the main fuse F1 near the battery terminal is blown (check for continuity) or a diode (D15 or 16) on the back of the board near the power connector is bad (it gets hot). Occationally there is a transitor that gets hot on the front of the board Q22 that fails (boots but to a grey screen). |
Posted by: croissantking on 2023-01-09 06:13:14
Does anyone have a diagram of what each item on the PowerBook 145b's motherboard is? As far as I know, nobody has got their hands on any schematics for these. |
Posted by: Dogmander on 2023-06-16 12:52:16
bitsavers has schematics for the 140, which also apply to the 145(b) and 170.
http://bitsavers.org/pdf/apple/mac/powerbook/140/ |
Posted by: 3lectr1cPPC on 2023-06-16 12:52:47
Fairly certain those are incomplete. |
Posted by: Dogmander on 2023-06-16 12:59:37
Fairly certain those are incomplete. What do you mean by incomplete? They have the schematic for mother and daughter boards |
Posted by: 3lectr1cPPC on 2023-06-16 13:02:05
Not sure. I've just heard that they are. |
Posted by: Dogmander on 2023-06-16 13:08:35
I mean, some of the text is hard to read but I wouldn’t consider them incomplete |
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