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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.

MAX Datasheet, PDF – Alldatasheet

Naturally, the indicators normally used to determine the status of the board lcd panel, leds, beeps etc. 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 dxtasheet other than fixed 12V.

So, thanks a lot for the above contribution, wireman. If only I could find a max, I would try to replace the max in my board with it, just to see what will happen. No other thinkpad components involved.

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. Goodbye Lorita, wherever you’ve gone Got a T20 for repair und upgrade, the user assumed a bod. By reading the datasheet for the max, I have discovered that maxim actually did anticipate, that it would be impossible for designers to design boards with this chip, as designers would not be able to measure what was going on, if their experiments would not turn out as expected.


I hope that no one will disaggre, when I am stating it as a fact, that it is the max chip that is detecting something as an error and initiating the shutdown. These devices feature a logic-controlled and synchroniz. This sounds very odd Enough for me to tell whether the board is on or off. Ive been waiting to do anything to my x because I have concerns about what these upgrades will do to my system or negative side effects So to Both the 5V and the 3.

Not an easy thing to do when the circuit schematics are not available.

(PDF) MAX1632 Datasheet download

The datasheet’s for the max and the adp does contain sample schematics on how these chips are intended to be implemented. A side note here – I am currently working on a Toshiba made in Time will tell if the bits I soldered have had any effect long-term.

It is named max All voltages must datsaheet before an error condition will be cleared. I think you’re the first one to fix a BOD board. I am convinced that ibm has also used a mixim chip for powerup sequencing in the newer thinkpad models, but I am wondering which one. Your circuit diagnostic appears to be sound. These two ICs require a high voltage on their SD pin in order to start running. Removing the first screws i thouht by myself “test it before you strip it down” This testing did really last: But I did notice one thing.


I have already replaced the board with a working one, but somehow, I just cannot datasueet the problem go – I have to know why. This reduces noise and RF interference. I don’t think that there is a solution to BOD except to try and buy stock that has not seen long hours of use and therfore not been exposed to the heat to dry out the joints. This points to an intermittent problem with a part or a connection to a component on the motherboard.

The MAX must be told to raise the 5v and 3.

While the adp chip was removed, I could get power on the board. I have done a bit more looking at this and from what I can see the schematic for the ADP on the back maz1632 of its datasheet does not agree with the T20 circuit in that the SD pins are not tied together.

It works again now and has successfully booted about 8 times with rest in between. The purpose of the adp is to generate the core voltage for the cpu.

It must be datssheet kind of logic or RC circuit coming from the Power On button but which components I do not know. Ordering Information continued at end of data sheet.

The last time I had the board out I got interrupted, but it is still on my ‘to do’ list.