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T440p won't boot, 3 flash, pause 3 flash

T430 and later, plus T530 and later series specific matters only
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rottgrub
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Joined: Wed Jul 10, 2019 10:55 pm
Location: Pittsburgh, PA

T440p won't boot, 3 flash, pause 3 flash

#1 Post by rottgrub » Wed Jul 10, 2019 11:14 pm

Hello all,

I've been a long time fan of Thinkpad hardware, and recently decided to try my luck putting together a working T440p from parts. Unfortunately, I may have picked a loser, as the motherboard doesn't want to power on.

When I plug in power, the CPU fan twitches, and the power light on the power button will blink three times, pause, and then blink three times again. When I press the power button, the same 3 and 3 blink pattern happens. It doesn't beep at any point.

I have removed the battery, CMOS battery, wifi card, keyboard, DVD drive, and tried with a single known good memory stick in either, or neither memory slot. I've held power for 10 seconds, 30 seconds, 60 seconds, with and without power cord attached.

Oddly, if I hold the power button, and then plug it in, the power button light stays on, but nothing else happens.

Kinda thinking dead motherboard, but since this pattern seems to be pretty common, I thought I'd ask here first before plunking down on a replacement. Any and all community wisdom is appreciated!

Cheers!

BillMorrow
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Re: T440p won't boot, 3 flash, pause 3 flash

#2 Post by BillMorrow » Thu Jul 11, 2019 12:11 am

welcome to the forum..
did you check the hardware maintenance manuals.. the one for your thinkpad..? look UP there to the "HMM" link..
Bill Morrow, kept by parrots :parrot: & cockatoos
Sysop - forum.thinkpads.com

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She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~

rottgrub
Posts: 2
Joined: Wed Jul 10, 2019 10:55 pm
Location: Pittsburgh, PA

Re: T440p won't boot, 3 flash, pause 3 flash

#3 Post by rottgrub » Thu Jul 11, 2019 8:25 pm

Thanks, I've been scouring the net looking for anything relevant, but no luck. Used the HMM to confirm cables and device locations. Nothing really specific about the 3flash, 3flash thing. 3flash is usually just a sign of power being applied, and it seems like there is power making it to the fan at the very least, but it doesn't seem to be bootstrapping to BIOS/POST at all.

Wondering if there is a fuse or something that could be blown. Lacking any "AHAH!" moments, I'm probably going to pull out the MB, and break out the tester this weekend.

On the good side, I won a second (working) T440p auction for $30, and $15 shipping. At least I won't be down a system while I noodle this out.

Cheers!

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