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Dead R51

R30/R40, A30/A31, G40/G50 and Z60/Z61 Series. NOT for AMD-Ryzen.
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SergioDeNice
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Joined: Fri Sep 22, 2023 4:02 am
Location: Toulouse, FRANCE

Dead R51

#1 Post by SergioDeNice » Fri Sep 22, 2023 4:11 am

Hi,

So I just bought this R51 for next to nothing and guess what... it won’t turn on.
I took away battery, optical drive, hard drive, RAM expansion and still nothing.
The power supply looks good though, 16V on my multimeter.
So I guess I should have a look at the fuses?
Could someone point me to a picture or schema of the motherboard so would I know where to look?
TIA

Sergio

SMA
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Location: Copenhagen, Denmark

Re: Dead R51

#2 Post by SMA » Fri Sep 22, 2023 10:45 am

As I see it there is only 1 fuse that can cause a completely dead r51 and
that is the fuse sitting very close to the dc in jack.

SergioDeNice
Posts: 2
Joined: Fri Sep 22, 2023 4:02 am
Location: Toulouse, FRANCE

Re: Dead R51

#3 Post by SergioDeNice » Sat Sep 23, 2023 4:29 am

Thanks. Does it look like the one in the thread below?
https://forum.thinkpads.com/viewtopic.php?t=70008

SMA
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Re: Dead R51

#4 Post by SMA » Sun Sep 24, 2023 11:24 am

It might look like the one linked to but smd fuses comes in a verity of colors and shapes.
Try a google search for smd fuse picture

RealBlackStuff
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Re: Dead R51

#5 Post by RealBlackStuff » Mon Sep 25, 2023 1:53 am

You can download R51 schematics for free here.
The fuse F2 is a 429007 or 0429007, which is a 7A/24V/Fast fuse.
You'll find it very close the the DC-in socket connector and next to it should be marked F2.
If that indeed is blown, it's easiest to just carefully solder a new one on top of the old one.
Lovely day for a Guinness! (The Real Black Stuff)
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