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t21 not turning on probably bod

T20-T23 Series and T30 specific matters only. NOT for T25-Retro.
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fiat682
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t21 not turning on probably bod

#1 Post by fiat682 » Sun May 24, 2020 8:40 am

hi i just got a t21 wich rarely turns on and just blinks hdd led, ive read about the bod but the fix is to replace the chip but i cant solder and neither i have the equipment to do so, i updated the bios but i still need to get it to power on again
lenovo x220i tablet bought in 2018,Windows 7 pro, sadly not original, 6GB RAM
ORIGINAL BATTERY FROM 2011 WITH 700 CYCLES still 1hr with power manager at middle settings (wich i use for browsing)
thinkpad t22 BOD

fiat682
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Re: t21 not turning on probably bod

#2 Post by fiat682 » Sat Aug 08, 2020 12:59 pm

can someone help?
lenovo x220i tablet bought in 2018,Windows 7 pro, sadly not original, 6GB RAM
ORIGINAL BATTERY FROM 2011 WITH 700 CYCLES still 1hr with power manager at middle settings (wich i use for browsing)
thinkpad t22 BOD

kfzhu1229
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Re: t21 not turning on probably bod

#3 Post by kfzhu1229 » Sat Aug 08, 2020 2:49 pm

Well if it really is a suspect of blink of death, not sure if this would help, but I think if you have a multimeter you can have a chance to look at the ADP3421 chip and see if it's bad. But the risk is if you short some legs together by some butterfingers and that the machine had power connected, you say goodbye to your motherboard.
I haven't had a blink of death before but I had a very similar ADP3420 chip in a Pentium III CPU that failed and I found that out by finding out that one of the legs was shorted to ground despite it supposed to have 2.5V of input! The result is the transistor that generated that 2.5V of input voltage to the chip was burning hot.
viewtopic.php?f=11&t=130095&p=843601&hi ... 20#p843601
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Bondi
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Re: t21 not turning on probably bod

#4 Post by Bondi » Sat Aug 08, 2020 2:51 pm

Indeed this sounds like BOD. There is another way of curing it, but no guarantees of course. But it still requires soldering (a resistor), but not too complicated. More details here (german) https://thinkwiki.de/BoD
Thinkpads: 330C, 360CE, 560, 755CD, 760LD, 760EL, A21p, A31p, X60s, X230

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Re: t21 not turning on probably bod

#5 Post by dr_st » Sat Aug 08, 2020 3:33 pm

Bondi wrote:
Sat Aug 08, 2020 2:51 pm
Indeed this sounds like BOD. There is another way of curing it, but no guarantees of course. But it still requires soldering (a resistor), but not too complicated. More details here (german) https://thinkwiki.de/BoD
I consider doing this on my BoD-affected A21m. I understood that it's considered a safe fix (meaning, if it works, it works, and does not significantly increase risk of damaging other components), and if it doesn't work, it means that the chip is totally dead and has to be replaced. Do you agree with this assessment?
Thinkpad 25 (20K7), T490 (20N3), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

kfzhu1229
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Re: t21 not turning on probably bod

#6 Post by kfzhu1229 » Sat Aug 08, 2020 4:12 pm

dr_st wrote:
Sat Aug 08, 2020 3:33 pm
I consider doing this on my BoD-affected A21m. I understood that it's considered a safe fix (meaning, if it works, it works, and does not significantly increase risk of damaging other components), and if it doesn't work, it means that the chip is totally dead and has to be replaced. Do you agree with this assessment?
Ah I have done this trick to troubleshoot before. This is to trick the SuperIO chip to think everything is working well instead of shutting the machine down. After you solder the resistor make sure to probe around with a multimeter to see if you have connected the surrounding pins too (Pin 24 is Vcc but Pin 22 is Ground!)
With this connected, if it still doesn't work, perhaps now it's a good time to bring out a Voltmeter and measure the voltages on each pin of the leg to see if they are all in spec. Also, put your finger around the surrounding capacitors and transistors to see if they are abnormally hot. Again my dead ADP3420 chip brought down a 2.5V clock rail to ground and as a result the transistors and a capacitor connected to that pin are burning hot.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Lat D830 X9000 8gb 128gb WSXGA+ Ultrasharp fp W10
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Bondi
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Re: t21 not turning on probably bod

#7 Post by Bondi » Tue Aug 11, 2020 10:56 am

dr_st wrote:
Sat Aug 08, 2020 3:33 pm
Bondi wrote:
Sat Aug 08, 2020 2:51 pm
Indeed this sounds like BOD. There is another way of curing it, but no guarantees of course. But it still requires soldering (a resistor), but not too complicated. More details here (german) https://thinkwiki.de/BoD
I consider doing this on my BoD-affected A21m. I understood that it's considered a safe fix (meaning, if it works, it works, and does not significantly increase risk of damaging other components), and if it doesn't work, it means that the chip is totally dead and has to be replaced. Do you agree with this assessment?
Frankly, I have not yet tried this method. But from what I read on german thinkpads forum it's a safe mod, given that nothing is shorted.
My A21p showed BoD symptoms some time ago, to my regret. I was already going to find someone to replace the Atmel chip, but yesterday I tried resitting the RAM modules. And it booted fine several times. I'm not not sure if it was bad RAM contact or it worked because of a 3 months resting.
Thinkpads: 330C, 360CE, 560, 755CD, 760LD, 760EL, A21p, A31p, X60s, X230

fiat682
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Re: t21 not turning on probably bod

#8 Post by fiat682 » Thu Aug 13, 2020 1:24 pm

thanks for the replies, regarding the tester i dont wanna risk because i have too "fat" leads, i will try to find someone who solders on pcb and get the 2.2 resistor and see if it fixes, because i have little experience on soldering in general and a too big soldering tip and a normal fixed temp iron
lenovo x220i tablet bought in 2018,Windows 7 pro, sadly not original, 6GB RAM
ORIGINAL BATTERY FROM 2011 WITH 700 CYCLES still 1hr with power manager at middle settings (wich i use for browsing)
thinkpad t22 BOD

kfzhu1229
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Re: t21 not turning on probably bod

#9 Post by kfzhu1229 » Thu Aug 13, 2020 2:47 pm

fiat682 wrote:
Thu Aug 13, 2020 1:24 pm
thanks for the replies, regarding the tester i dont wanna risk because i have too "fat" leads, i will try to find someone who solders on pcb and get the 2.2 resistor and see if it fixes, because i have little experience on soldering in general and a too big soldering tip and a normal fixed temp iron
Well I suppose you can try the multimeter trick again and see if the pins that are supposed to have voltage are shorted to ground. That can be done with the machine off so you don't have anything to risk for
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Lat D830 X9000 8gb 128gb WSXGA+ Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

fiat682
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Re: t21 not turning on probably bod

#10 Post by fiat682 » Fri Aug 14, 2020 10:46 am

what pins im supposed to check and how do can i see if its grounded?
lenovo x220i tablet bought in 2018,Windows 7 pro, sadly not original, 6GB RAM
ORIGINAL BATTERY FROM 2011 WITH 700 CYCLES still 1hr with power manager at middle settings (wich i use for browsing)
thinkpad t22 BOD

kfzhu1229
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Re: t21 not turning on probably bod

#11 Post by kfzhu1229 » Fri Aug 14, 2020 1:19 pm

fiat682 wrote:
Fri Aug 14, 2020 10:46 am
what pins im supposed to check and how do can i see if its grounded?
Here is a pic of the pinout for ADP3421:
https://1drv.ms/u/s!At7-rt1KJ7WviPcyVan ... w?e=AtZD3l
The pin that I have circled in red was the fault I had with my ADP3420 chip (they have the same pinouts), which ended up shorting to ground. In that case switching the multimeter to continuity mode you will get a beep and also saying it is near 0 ohms!
I don't think anything except for pin 16 and pin 22 (Perhaps also 27 and 28) which are the ground pins should have continuity to ground! Some pins may have low resistance but nothing should have a resistance lower than like 8-10Ohms to the ground pin!
Since there isn't anything for you to lose with the machine powered off, test every pin's continuity to pin 22 ground, you should have only pin 16, possibly 27, 28 (and 22 itself) read less than 8-10Ohms in resistance.
If you do have other pins reading less than that, report it here and I'll try to see if it's actually a problem.
Alternatively, if you have steady hands, you can try plugging the laptop in (to ac and/or battery) but do NOT power it on yet. Now switch to DC voltage mode, and measure the voltage for pin 15 and 16 and 24 to ground. If any of them have no significant voltage, you have a problem. Pin 24 should read around 3.3V in voltage.
This can be slightly risky though because if your multimeter probe slips and shorts out the legs, the chip may get fried if it isn't already fried. What can reduce this chance though is instead of probing exactly at the pin legs, find another spot less prone to slipping mistakes that has direct continuity to that leg and measure there.
If those three pins measure normally, now press the power button. AFAIK for this blink of death problem one or more of pin 15 and 16 will drop down to near 0 after the blink of death and then won't go back up until you reconnect the power.
Dell Lat CP MMX-233 64mb 40gb W2k
600 PII-266 416mb 40gb WXP
T23 PIII 1.13ghz 1gb W7
Lat D830 X9000 8gb 128gb WSXGA+ Ultrasharp fp W10
T530i 15.6" i7 16gb fp W10
UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10 (Sharp)
Lat C840 P4-2.5 2gb 60gb W7 (Ultrasharp)

fiat682
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Re: t21 not turning on probably bod

#12 Post by fiat682 » Thu Aug 20, 2020 4:00 pm

i will look into it
lenovo x220i tablet bought in 2018,Windows 7 pro, sadly not original, 6GB RAM
ORIGINAL BATTERY FROM 2011 WITH 700 CYCLES still 1hr with power manager at middle settings (wich i use for browsing)
thinkpad t22 BOD

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