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Also, the max will not reset immediately when power sources are removed from the machine, as the capacitors on at least one of the 5V and 3. Time will tell if datashewt bits I soldered have had any effect long-term. While the adp chip was removed, I could get power on the board.

So, thanks a lot for the above contribution, wireman. Hi, i have some questions about these machines. I use a laboratory power supply to power the board. This points to an intermittent problem with a part or a connection to a component on the motherboard.

So now I have to contact the seller and see what can be done: This is kind of like the inductors trouble on T23’s.

If you were successful, I suppose the next step for someone would be to resolder each component one at mmax1632 time If you are correct the main issue will be to try to find a parts source for fresh T2X systemboards.

Also it did never refuse a warmboot! Max16332 that being now, where I think I might have found the answer to your original question. Once or twice it did boot from the battery solely and worked for an hour or so until it switched itself off.

(PDF) MAX1632 Datasheet download

Does anyone think that cause maybe related to the CPU? I have just taken out the 2nd board I was sent which failed after 7hrs use in order to send it back to the supplier along with the first one which lasted 2hrs before dying and giving an error Concerning the schematics I would say, that I datsheet not really missed them here.


The T22 I have had without power for several weeks still does not power up no matter if I use a battery only, AC only or both. No registered users and 3 guests. No other thinkpad components involved. Ordering Information continued at end of data sheet.

Besides the FAN works ok anyway. At that speed, a multimeter cannot visualize what is happening. Got a T20 for repair und upgrade, the user assumed a bod. It is even possible that the machines will run without any problems, if the shutdowns are only initiated due to a to restrictive protection circuitry. Do I buy yet another motherboard or am I wasting my time? The last time I had the board out I got interrupted, but it is still on my ‘to do’ list.

Datashedt reduces noise and RF interference. Naturally, the indicators normally used to determine the status of the board max1623 panel, leds, beeps etc. I removed the motherboard and touched up all inductors and caps on both sides but no joy still so I checked out the circuit having seen some posts about various voltage control ICs. I think you’re the first one to fix a BOD board.

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Rules of the Road Selling off my Thinkpad museum: I solved it by this D over hundred Attemps during several days showed no symptom of bod; Nearly convinced that is was ok i powered it up before writing a mail to the owner. SECFB provides a method for adjusting the sec- ondary winding voltage regulation point with an external resistor divider, and is intended to aid in creating auxiliary voltages other than fixed 12V. Goodbye Lorita, wherever you’ve gone Just kept an eye on the meter on the power supply and a finger on the cpu, datashfet that I would be warned, should the cpu temperature start rising – which it did not the adp was removed.


The boards I can source are im im I have mqx1632 a bit more looking at this and from what I can see the schematic for the ADP on the back page of its datasheet does not agree with the T20 circuit in that the SD pins are not tied together. The only advice I have would be to trace back from those two MAX pins and see where they lead.

But I did notice one thing. I mentioned this to my supplier who sent mas1632 out another mobo and after fitting it my laptop worked perfectly for 7 hrs My question is does anybody know where these pins are fed from? This is where I was getting stuck earlier.

MAX1632 PDF Datasheet浏览和下载

I just bought a defect T40 on ebay earlier today. Once the protection circuity has been disabled, the real error might reveal itselves by sending out a smoke signal or at least making it possible max16322 do some ordinary voltage measurements within the power circuitry. If something got “fried”, then the system would never boot at all.

And the actual implementation seems to be close enough for the samples to be useful.