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Help Identify this blown chip on Thinkpad X61s please
Help Identify this blown chip on Thinkpad X61s please
Hi All
Recently my trusty old X61s died - I had foolishly left it powered up (via a docking station, and possibly with a fake "Lenovo" power supply) for a long period of time. When I returned it was totally dead. After a bit of investigation I have opened it up and discovered one chip that is undoubtably dead - see attached photos.
I am not sure that it is feasible for me to replace this chip (and of course it may not be the only fault) but I am pretty good with a soldering iron and am considering having a go. Can anyone help me identify the blown part?
The chip is an 8-way DIL small outline IC, situated on the underside of the motherboard near the dock connector. There are a few markings nearby but I am not certain if any refer to the actual chip.
if anyone can help me identify this chip (and perhaps even the fault that caused its demise) I would be very grateful. I am binning the suspect PSU FWIW!
http://images.jkn.webfactional.com/x61s ... chip_1.jpg
http://images.jkn.webfactional.com/x61s ... chip_2.jpg
The first image is a photo of the general area, and the second is a bit of a close-up for the frazzled chip
Thanks a lot
Jon N
Recently my trusty old X61s died - I had foolishly left it powered up (via a docking station, and possibly with a fake "Lenovo" power supply) for a long period of time. When I returned it was totally dead. After a bit of investigation I have opened it up and discovered one chip that is undoubtably dead - see attached photos.
I am not sure that it is feasible for me to replace this chip (and of course it may not be the only fault) but I am pretty good with a soldering iron and am considering having a go. Can anyone help me identify the blown part?
The chip is an 8-way DIL small outline IC, situated on the underside of the motherboard near the dock connector. There are a few markings nearby but I am not certain if any refer to the actual chip.
if anyone can help me identify this chip (and perhaps even the fault that caused its demise) I would be very grateful. I am binning the suspect PSU FWIW!
http://images.jkn.webfactional.com/x61s ... chip_1.jpg
http://images.jkn.webfactional.com/x61s ... chip_2.jpg
The first image is a photo of the general area, and the second is a bit of a close-up for the frazzled chip
Thanks a lot
Jon N
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Re: Help Identify this blown chip on Thinkpad X61s please
That is chip U47, a MOSFET with P/N SI4425BDY-1-GP
The nearby Q43 is a MOSFET with P/N SI4435BDY-T1-1GP
The nearby Q43 is a MOSFET with P/N SI4435BDY-T1-1GP
Lovely day for a Guinness! (The Real Black Stuff)
Re: Help Identify this blown chip on Thinkpad X61s please
Wow, that was very quick, thank you!RealBlackStuff wrote:That is chip U47, a MOSFET with P/N SI4425BDY-1-GP
The nearby Q43 is a MOSFET with P/N SI4435BDY-T1-1GP
Do you mention Q43 for comparison, or just for refernce? I wonder why one has the 'Q' prefix, and one has 'U'? That was partly why I wasn't convinced that it was U47 I was looking at.
Is this failure a well-known one? I am wondering how much hope I can put into being able to resurrect the laptop. I can get the mosfet via Farnell (in the UK, similar to Mouser etc.) but I wouldn't be surprised if the pads/traces are too vaporised.
Thanks again for the great start anyway!
Regards
Jon N
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Re: Help Identify this blown chip on Thinkpad X61s please
D=Diode
R=Resistor
C=Capacitor
J=Jack
Q=Questionable(?)
U=Universal (?), used for many power-related chips
MOSFETs are the ones that blow if power is "overdone".
Can happen on any laptop.
Replacement might fix it, but check the neighbouring parts as well.
R=Resistor
C=Capacitor
J=Jack
Q=Questionable(?)
U=Universal (?), used for many power-related chips
MOSFETs are the ones that blow if power is "overdone".
Can happen on any laptop.
Replacement might fix it, but check the neighbouring parts as well.
Re: Help Identify this blown chip on Thinkpad X61s please
Heh - I like the 'Q' . I am used to seeing that for discrete semiconductors.RealBlackStuff wrote:D=Diode
R=Resistor
C=Capacitor
J=Jack
Q=Questionable(?)
U=Universal (?), used for many power-related chips
Is there a parts list for the Motherboard that your info came from, or is this your 'accumulated knowledge'? I have the HMM but it doesn't go anything like as deep as individual components. I am just thinking about identifying the neighbouring parts you mention.
Thanks a lot
Jon N
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Re: Help Identify this blown chip on Thinkpad X61s please
Forgot:RealBlackStuff wrote:D=Diode
R=Resistor
C=Capacitor
J=Jack
Q=Questionable(?)
U=Universal (?), used for many power-related chips
F=Fuse (or F#&%$ part blew up again!)
L=Inductor
Y=Crystal
SW=Switch
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.
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- Admin Emeritus
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Re: Help Identify this blown chip on Thinkpad X61s please
The details came from the X61 schematics, a.k.a. KS-3 Block Diagram
Google is your friend...
Google is your friend...
Re: Help Identify this blown chip on Thinkpad X61s please
Got it, thank you. I have previously tried (and failed) to find schematics for other Thinkpads, and had assumed the same would be the case for the X61. I seem to have found something useful with your hints...RealBlackStuff wrote:The details came from the X61 schematics, a.k.a. KS-3 Block Diagram
Google is your friend...
Thanks again, Jon N
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