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T42 turns on but screen is blank - improved from: won't turn on

T40/T41/T42/T43 Series
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JRWooden
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Joined: Sat Sep 09, 2023 2:24 pm
Location: Charlotte, NC

T42 turns on but screen is blank - improved from: won't turn on

#1 Post by JRWooden » Sat Sep 09, 2023 3:05 pm

I am long time owner of a T42 had been using it and everything was fine.
It sat for several months and then would not turn on....
I'm familiar with the problem ... tried pulling the main battery and doing the magic dances with the power button - no luck

CMOS battery being old I ordered a new one.
I left the main battery out while the new CMOS battery was on order (about a week)

Just for giggles, when new CMOS battery came I reinstalled the main battery and ... it turned on.
power light, battery light, CPU fan, and occasional blink from HD but... NOTHING ON THE DISPLAY - just blank.

I took it apart unplugged the old CMOS battery and let it sit overnight.
Installed new CMOS battery the next day but condition is un-changed.
powers up, but blank display.
Any suggestions appreciated!

Thanks
Jim

JRWooden
Posts: 5
Joined: Sat Sep 09, 2023 2:24 pm
Location: Charlotte, NC

Re: T42 turns on but screen is blank - improved from: won't turn on

#2 Post by JRWooden » Sun Sep 10, 2023 11:45 am

I've been "focused" on thinking it's a battery / CMOS issue of some sort, but ...
I could be having some totally different problem that just kinda popped-up at the same time.

IIRC bad RAM will give a POST error not a blank screen :?:

It does NOT appear to be booting up as the HD activity is very modest....

:banghead:

Gonzaleitor
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Location: Buenos Aires, Argentina

Re: T42 turns on but screen is blank - improved from: won't turn on

#3 Post by Gonzaleitor » Sun Sep 10, 2023 12:03 pm

Bad RAM would give You some beeps. Did you try to connect it to an external monitor?

astral
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Location: Ohio

Re: T42 turns on but screen is blank - improved from: won't turn on

#4 Post by astral » Sun Sep 10, 2023 2:03 pm

sounds to me like one of the classic t4x failures. gpu perhaps, or the southbridge. though, i think the southbridge failures are mostly for the t43s.

these suffered from bad solder, and can give symptoms like these when one of the chips solder cracks.
Your average ThinkPad collector.
Owns: T480, Yoga S1, modded T430, T61p, R60e, T43 14" SXGA+, G40, T30 SXGA+, T23, A22p, T21, i1260, 385XD, 560, PS/Note 425

JRWooden
Posts: 5
Joined: Sat Sep 09, 2023 2:24 pm
Location: Charlotte, NC

Re: T42 turns on but screen is blank - improved from: won't turn on

#5 Post by JRWooden » Sun Sep 10, 2023 7:43 pm

Thanks for the suggestions!

I did try an external monitor ... but forgot to mention it...
It didn't light up either :-/

I appreciate the suggestions!

I guess it's dead :banghead:

Gonzaleitor
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Joined: Thu Nov 10, 2022 4:01 pm
Location: Buenos Aires, Argentina

Re: T42 turns on but screen is blank - improved from: won't turn on

#6 Post by Gonzaleitor » Mon Sep 11, 2023 3:43 pm

It seems to me that your gpu has a bad solder problem. Maybe, because you have nothing to lose, you can try to bake the mobo trying to resolder the gpu.
I recommend that you look it up in youtube so you can have a good tutorial.

JRWooden
Posts: 5
Joined: Sat Sep 09, 2023 2:24 pm
Location: Charlotte, NC

Re: T42 turns on but screen is blank - improved from: won't turn on

#7 Post by JRWooden » Tue Sep 12, 2023 9:57 am

Thank you!

I may try that ... or get a buddy to try that ...

It could save the venerable T42's life! 8)

Gonzaleitor
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Re: T42 turns on but screen is blank - improved from: won't turn on

#8 Post by Gonzaleitor » Wed Sep 13, 2023 11:19 am

Yeah, it might. If you have a heat gun it may be even simpler.
Make an update after you do it!

JRWooden
Posts: 5
Joined: Sat Sep 09, 2023 2:24 pm
Location: Charlotte, NC

Re: T42 turns on but screen is blank - improved from: won't turn on

#9 Post by JRWooden » Thu Sep 14, 2023 10:30 am

Gonzaleitor wrote:
Wed Sep 13, 2023 11:19 am
Yeah, it might. If you have a heat gun it may be even simpler.
Make an update after you do it!
Will do that ... it may be a while, I'm now traveling for a while and not sure when I'll be back,
but again, THANK you all for your help!

Gonzaleitor
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Posts: 135
Joined: Thu Nov 10, 2022 4:01 pm
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Re: T42 turns on but screen is blank - improved from: won't turn on

#10 Post by Gonzaleitor » Thu Sep 14, 2023 12:35 pm

No problem, good luck!

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