Dead R51

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SergioDeNice · #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 · #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 · #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 · #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

#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.

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