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A true fix for blink of death circuit for T21 (caution image
A true fix for blink of death circuit for T21 (caution image
I've been searching these forums for the better part of a year now and have had no need to register, until now.
I have been battling the "blink of death for the T20 T21 T22" and now I have had a breakthrough on a T21.
Only and only if your machine will not boot and yes you've tried the power button trick, but didn't work. (Push it ten times, others say hold it for 90 seconds)
I recommend replacing the ADP3421 chip on the board. I saw these somewhere on this forum, although the author just casually mentions it, w/o giving some thought that he might have answered a major question.
This new chip for this T21 came from a stack of bad boards that have various other problems, but not the blink of death.
I have been battling the "blink of death for the T20 T21 T22" and now I have had a breakthrough on a T21.
Only and only if your machine will not boot and yes you've tried the power button trick, but didn't work. (Push it ten times, others say hold it for 90 seconds)
I recommend replacing the ADP3421 chip on the board. I saw these somewhere on this forum, although the author just casually mentions it, w/o giving some thought that he might have answered a major question.
This new chip for this T21 came from a stack of bad boards that have various other problems, but not the blink of death.
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Thanks for this post; hopefully it will help. I believe the Analog Devices ADP3421 is located at D6 in this scan:
http://www.rkawakami.net/ibm_t2x/t21_mo ... legend.jpg
http://www.rkawakami.net/ibm_t2x/t21_mo ... legend.jpg
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.
For what it's worth
I've located a supplier of ADP3421 chips, for those who want to take on a similar project
http://www.pchub.com/uph/laptop/507-284 ... onent.html
http://www.pchub.com/uph/laptop/507-284 ... onent.html
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Thought I would order a couple of those... when I got to the checkout it was $16 for shipping (!). Found out that PCHub.com is based in Singapore.
My inclination is that there's a short between some of the pins in this area or an open circuit. The short could be from a "tin whisker" which has formed between two adjacent leads. A good scraping between the pins of the ADP3421 (with the power disconnected naturally) and a close inspection of the soldered leads might be a good first attempt at a fix.
My inclination is that there's a short between some of the pins in this area or an open circuit. The short could be from a "tin whisker" which has formed between two adjacent leads. A good scraping between the pins of the ADP3421 (with the power disconnected naturally) and a close inspection of the soldered leads might be a good first attempt at a fix.
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.
I have replied once with this solution for a BOD problem. I also wrote in the same post that replacing the ADP will solve the BOD for some of the boards with a BOD problem but not all BOD problem boards can be fixed by replacing the ADP as there can be several causes for this BOD problem.
Up to now I have managed to fix 3 boards by replacing the ADP chip, don't have any more dead boards to fix...
Msmax.
Up to now I have managed to fix 3 boards by replacing the ADP chip, don't have any more dead boards to fix...
Msmax.
How about just re-soldering all the legs on that chip?
I do not believe that there is a real short or open circuit around there.
It is more likely that there is a tiny bit of resistance in one of the solder leads.
Preventing the chip from settling and also making the chip more sensitive to noise spikes from VCC, which happen to be the 3.3V.
Could also be a bad solder sitting in the other end of one of the traces going to/from that chip. That would account for the cases where
replacing the chip did not solve the problem.
Like msmax, I am also without any BoD boards to try with, but I am still searching, hoping to find one soon.
I do not believe that there is a real short or open circuit around there.
It is more likely that there is a tiny bit of resistance in one of the solder leads.
Preventing the chip from settling and also making the chip more sensitive to noise spikes from VCC, which happen to be the 3.3V.
Could also be a bad solder sitting in the other end of one of the traces going to/from that chip. That would account for the cases where
replacing the chip did not solve the problem.
Like msmax, I am also without any BoD boards to try with, but I am still searching, hoping to find one soon.
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Replacing the ADP3421 and/or the ADP3410 was discussed in these threads:
http://forum.thinkpads.com/viewtopic.php?t=34809
http://forum.thinkpads.com/viewtopic.php?t=36064
http://forum.thinkpads.com/viewtopic.php?t=20818
As Msmax said, he posted in the first two threads, and there doesn't seem to be a 100% success rate.
http://forum.thinkpads.com/viewtopic.php?t=34809
http://forum.thinkpads.com/viewtopic.php?t=36064
http://forum.thinkpads.com/viewtopic.php?t=20818
As Msmax said, he posted in the first two threads, and there doesn't seem to be a 100% success rate.
Gary A.
lenovo: T490 (20N20028US) | i7-8565U | 16GB | 512GB SSD | FHD LED | WiFi 9560 | Bluetooth | Webcam | Win10 Pro x64 | Full System Specs
lenovo: T490 (20N20028US) | i7-8565U | 16GB | 512GB SSD | FHD LED | WiFi 9560 | Bluetooth | Webcam | Win10 Pro x64 | Full System Specs
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To look closer at possible soldering 'mistakes', these type of USB microscopes might be helpful:
http://cgi.ebay.com/USB-200X-Handheld-D ... 0215866205
Up to 200x magnification
http://cgi.ebay.com/USB-200X-Handheld-D ... 0215866205
Up to 200x magnification
Lovely day for a Guinness! (The Real Black Stuff)
Lenovo: X240, X250, T440p, T480, M900 Tiny.
PS: the old Boardroom website is still available on the Wayback Machine.
Lenovo: X240, X250, T440p, T480, M900 Tiny.
PS: the old Boardroom website is still available on the Wayback Machine.
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From everything I have read about BOD problems, I am inclined to say that it has nothing to do with solder problems of the ADP3421. I took a look at 2 of my BOD boards under the scope and the solder looks fine: no cold joints, no voids, no cracks or loose pins.
I also think that if the Analog devices parts are indeed failing it is a result of poor design (either of the part itself or the surrounding circuit). So it will probably occur again (no news there).
I am in for (2) ADP3421 devices if someone bulk orders.
I also think that if the Analog devices parts are indeed failing it is a result of poor design (either of the part itself or the surrounding circuit). So it will probably occur again (no news there).
I am in for (2) ADP3421 devices if someone bulk orders.
This was mentioned in detail back in January in the main BOD thread by augustsamame in Lima Peru of all places.
"It is our experience that in 90% of all cases, replacing the ADP3421 IC will solve the BOD problem, but all the other secondary voltage regulators will need to be checked too or the replacement ADP will fail eventually, sometimes within hours. "
He had I think, the best analysis of the problem that I have read.
"It is our experience that in 90% of all cases, replacing the ADP3421 IC will solve the BOD problem, but all the other secondary voltage regulators will need to be checked too or the replacement ADP will fail eventually, sometimes within hours. "
He had I think, the best analysis of the problem that I have read.
X200s 7470-A12 1.86Ghz 8GB WXGA+ 1440x900 HyperX SSD 120GB Windows7 Pro 64bit
T42 Retired
T42 Retired
Anyone notice about input current?
Dear Guys,
I've also got 2 BOD Thinkpad T20 and T21 from my friends just few days ago. I'm now looking into the problem as well as far as I've read the articles and findings here. I'll try to inspect the board and just ordered some ADP3421 for replacement.
Anyway, my point is, did anyone noticed that the input voltage and current of the power supply, original from IBM, was 16V and 4.5A?
Yes, it's official power supply. The question is, would this current blow anything in the motherboard? I'm not a pro in electronics, but I've read carefully on the bottom of the laptop reads: 16V and 3.36A.
This 16V 3.36A type of power supply adaptor used to be for the older Thinkpads like the 600 series (TP600, 600E and 600X).
I just don't know, even if I replaced the ADP3421 and if that works, would this 4.5A blow anything out later? Like, another BOD after a while?
I tried before using a 3.36A power supply and it also worked for T20 and T21. Quite stable.
I just knew that higher than specified current will work, but it may also blow something up. Any idea from pro users alike? I wish to understand more too.
Regards,
Felix
I've also got 2 BOD Thinkpad T20 and T21 from my friends just few days ago. I'm now looking into the problem as well as far as I've read the articles and findings here. I'll try to inspect the board and just ordered some ADP3421 for replacement.
Anyway, my point is, did anyone noticed that the input voltage and current of the power supply, original from IBM, was 16V and 4.5A?
Yes, it's official power supply. The question is, would this current blow anything in the motherboard? I'm not a pro in electronics, but I've read carefully on the bottom of the laptop reads: 16V and 3.36A.
This 16V 3.36A type of power supply adaptor used to be for the older Thinkpads like the 600 series (TP600, 600E and 600X).
I just don't know, even if I replaced the ADP3421 and if that works, would this 4.5A blow anything out later? Like, another BOD after a while?
I tried before using a 3.36A power supply and it also worked for T20 and T21. Quite stable.
I just knew that higher than specified current will work, but it may also blow something up. Any idea from pro users alike? I wish to understand more too.
Regards,
Felix
Re: A true fix for blink of death circuit for T21 (caution image
I know this topic is ancient but I bought a T20,T21 and 22 from ebay someone selling them off as parts in the hope i could build a decent laptop from them and a T22 seeing as its the faster of the 3 I want to install windows 95 or 98 for some dos and retro gaming and seeing as the T22 supports Soundblaster it's ideal, anyway these laptops were sold as dead and having received them. all 3 have the BOD the same symptoms power light would flash when pressing on, thanks to this post i was able to revive all 3 motherboards with new ADP3421 chips so a big thanks to who ever found a fix for this I now have a fully working and mint condition t22 for some retro gaming.
The job was easy enough to do though, i used tin foil tape around all the components bar the ADP3421 as to not burn or take any other components off, put the heat gun over it and the chip lifted right off, cleaned up the pads with solder wick, applied some flux to the pads, placed the chip on and drag soldiered the new chip in place.
The job was easy enough to do though, i used tin foil tape around all the components bar the ADP3421 as to not burn or take any other components off, put the heat gun over it and the chip lifted right off, cleaned up the pads with solder wick, applied some flux to the pads, placed the chip on and drag soldiered the new chip in place.
Re: A true fix for blink of death circuit for T21 (caution image
I have not yet encountered BoD on my transnote (has the exact same problem as the T21), but I was wondering that another way to avoid this problem is to install a 1,8K resistor (more information here (german)) before BoD happens. I saw various posts about "fixing" the problem with just this pull-up resistor but it is not succesfull in all cases.
Could soldering such a resistor make my thinkpad imume to BoD before it ever happens? I wonder what others think about this.
Could soldering such a resistor make my thinkpad imume to BoD before it ever happens? I wonder what others think about this.
Lenovo; I dont want Lenovo's
IBM Thinkpad: T60, R52, X31, G40, A20p, 240X, 380Z, 701Cs, 365XD, 340, 860, TransNote
IBM PS2/note: 700C, N51sx, N33sx, CL57sx
IBM Thinkpad: T60, R52, X31, G40, A20p, 240X, 380Z, 701Cs, 365XD, 340, 860, TransNote
IBM PS2/note: 700C, N51sx, N33sx, CL57sx
Re: A true fix for blink of death circuit for T21 (caution image
I definitely agree that all the 'proposed' different fixes out there in my experience are not permanent.
I had a huge pile of these machines with BoD and I could fix some using different suggestions but many of which I came back to later and the BoD had re-occured and whatever the fix was used initially did not work a second time. Something 'bad' in the architecture of these machines causes BoD to occur in a few different ways. To the extent that I generally gave up on the idea. The T2x is a lovely example of the evolution of the Thinkpad but to nearly everyone in the world not more important than 30 other variants. So unless you get overwhelming enjoyment chasing a gremlin around a circuit board for almost no payoff then it's all a bit of a waste of time.
Particularly as there is a lot of these machines out there.
Having said all of that, the resistor *before* damage occurs to the chip may well help many cases, but from my dim memory it wasn't just that IC that was the cause of BoD....
I had a huge pile of these machines with BoD and I could fix some using different suggestions but many of which I came back to later and the BoD had re-occured and whatever the fix was used initially did not work a second time. Something 'bad' in the architecture of these machines causes BoD to occur in a few different ways. To the extent that I generally gave up on the idea. The T2x is a lovely example of the evolution of the Thinkpad but to nearly everyone in the world not more important than 30 other variants. So unless you get overwhelming enjoyment chasing a gremlin around a circuit board for almost no payoff then it's all a bit of a waste of time.
Particularly as there is a lot of these machines out there.
Having said all of that, the resistor *before* damage occurs to the chip may well help many cases, but from my dim memory it wasn't just that IC that was the cause of BoD....
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