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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. Did you just heat up the solder points enough to reflow it or did you remove it with a datasheft braid and resolder?
But I did notice one thing. These devices feature a logic-controlled and synchroniz- able, fixed-frequency, pulse-width-modulation PWM operating mode. This are the first thing that i look for in Car Radio with surface mount component.
Maxim recommends using max during development and max for production – ibm seems to have followed fatasheet recommendation.
MAX1632 Datasheet PDF
I’ve recently bought a thinkpad x type It takes approximately 18 milliseconds for a max to shutdown – might well be the same for a max All links to PC-Doctor software hosted by me are dead. I mentioned this to my supplier who sent me out another mobo and after fitting it my laptop worked perfectly for 7 hrs 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.
My question is does anybody know where these pins are fed from? If something got “fried”, then the system would never boot at all.
Ordering Information continued at end of data sheet. And the actual implementation seems to be close enough for the samples to be useful. At that speed, a multimeter cannot visualize what is happening. In my opinion, it does not matter how the machine is being power when trying to start it up. Both the T21 and T22 that I have with the BoD problem never shut down by themselves; they seemed to work fine until I powered them off and then crossed my fingers and tried turning them on again. Do I buy yet another motherboard or am I wasting my time?
I just bought a defect T40 on ebay earlier today. EBay is obviously not the right answer. This is kind of like the inductors trouble on T23’s. I stripped it down and checked the connector board along the back of my case and all the joints seemed fine and the micro switches all worked fine. Not an easy thing to do when the circuit schematics are not available.
The pins of the connecters looked like they could do with more solder and i noted that there were often connections on both sides of the board so a good hot soldering iron is a must inorder to transmit the heat to the flip side of the board.
Might well be the same on a T2x board. Last time I was doing measurements on this motherboard, I was using a setup, where I had attached the motherboard directly to a port-replicator.
All voltages must disappear before an error condition will be cleared. Strong 1A on-board gate drivers ensure fast external. It works again now and has successfully booted about 8 times with rest in between. Controllers for Notebook Computers.
MAX Datasheet, PDF – Alldatasheet
While the adp chip was removed, I could get power on the board. 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. For this reason maxim actually made a chip similar to the max, but without the protection circuitry. I had to read it several times as you had so much done already on this. I belive that if Toshiba designers had chosen the max for this model, then the machine I am working on, would now be showing the BOD symptoms.
Rules of the Road Selling off my Thinkpad museum: SMA seems to have spent quite a bit of time on this too and thank you for your information. Ray’s machines does stay on when they do turn on. My next experiment will be to try to power up the board with the cpu removed. The fact that the solder has been dried out in those areas which see the most heat means that the symptom is alway power related but can be a variety of actual causes.
T20 Blink Of Death Circuit Questions – Thinkpads Forum
If you were successful, I suppose the next step for someone would be to resolder each component one at a time I think you’re the first one to fix a BOD board. My T23 does mad1632 same as you guys mention The strange thing is that Toshiba designers have not followed the maxim recommendation of using the max in the final datashert. I would still like to know though.
Finding a working board should not be a problem. I just have to know which mixim chip is in there.
A side note here – I am currently working on a Toshiba made in What I have found is a top Xs and a couple of mobos for X It was long enough to get a CPU temperature and battery monitoring program to run.
If you are correct the main issue will be to try to find a parts source for datasheey T2X systemboards. The status of the board will have to be determined by voltage measurements or similar. It did not help.