Hi,

Got a B142 it was working and then from nothing it froze and now it has the same problem you are reporting.

Did you found out any possible repair?

Maybe BIOS reflash works. Some mainboards I have got my hands on show similar problems. Plain dead, but after flashing the BIOS with an external programmer they sprung to life again.

With laptops it is more challenging to do this. If you can find a BIOS ROM file, then you need to get to the BIOS chip as well and hope it's not soldered on to the mainboard.

I would check MB for leaky capacitors, especially those for VRM. Also measure voltages from PSU, I assume this one has internal one instead of external brick. PSU may have capacitor or regulator issues and it is not working properly.

When diagnosing electronics, it is important to rule out the basics, that is power delivery. If you have oscilloscope, you can also check that the crystal is working (CPU has clock) and try to find and check reset signals, memory lines, video circuitry etc. and see where there is and isn’t life.

If those things seem OK, then it may be one of your suggestions or something like a cracked solder joint somewhere.

Can you plug an external monitor to it, does anything show up?

Does the caps LED respond to capslock key press?

GenkiMan_Lx wrote on 2025-09-10, 04:02:

Hi,

Got a B142 it was working and then from nothing it froze and now it has the same problem you are reporting.

Did you found out any possible repair?

No , it's driving me up the walls , I can't locate the RAM of GPU of the NEO on the Motherboad. (that seem to be the issue) however can also be a blown capacitor somewhere but because it starts and powers the Hard Drive and charges I am unable to fix it (I have 2 of them with problem)

I can dump the bios (may be corrupted but highly unlikely) if you wish.

MikeSG wrote on 2025-09-10, 07:44:

Can you plug an external monitor to it, does anything show up?

- Sadly NO. NO POST.

kotel wrote on 2025-09-10, 09:25:

Does the caps LED respond to capslock key press?

- There is NO CAPs Led-light. (just the middle LCD screen) not showing up there , and not loading OS. Just chargeing and you can only know it's alive it you have a hard disk(spinner) in there that spins up (doing nothing).

Any HELP IS WELCOMED (Sorry It took this long to write).

Ah, it's one of those fujitsu's with the LCD status LEDs thingy.
On a later lifebook s4572 there is a "kill switch" located at the back. It cuts the power to the entire laptop, leaving only the battery charging circuit active. If it's on the laptop boots up. Maybe yours has that switch too?
nvm your powers on but no POST, can be bad BIOS or CPU (these also can die for no reason).
Check CMOS battery next I guess. nvm you also tried this. Also check for a green pack of Varta Ni-MH cell pack. Those really like to leak (learned it the hard way on said laptop).
Also could be unsupported RAM since mine was picky about 256MB sticks. But this is unlikely since you've probably tried this by now.

So to summarize: bad BIOS (probably some PLCC32 EEPROM) or bad CPU.
Disassembly guide here.

kotel wrote on 2025-10-16, 16:26:

Ah, it's one of those fujitsu's with the LCD status LEDs thingy. On a later lifebook s4572 there is a "kill switch" located at […]
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Ah, it's one of those fujitsu's with the LCD status LEDs thingy.
On a later lifebook s4572 there is a "kill switch" located at the back. It cuts the power to the entire laptop, leaving only the battery charging circuit active. If it's on the laptop boots up. Maybe yours has that switch too?
nvm your powers on but no POST, can be bad BIOS or CPU (these also can die for no reason).
Check CMOS battery next I guess. nvm you also tried this. Also check for a green pack of Varta Ni-MH cell pack. Those really like to leak (learned it the hard way on said laptop).
Also could be unsupported RAM since mine was picky about 256MB sticks. But this is unlikely since you've probably tried this by now.

So to summarize: bad BIOS (probably some PLCC32 EEPROM) or bad CPU.
Disassembly guide here.

Sorry to disappoint , it had a 3v cell battery , it's pretty modern config. (yes it has a button but it powers up , laptop died in a metal-shielded-locked-box).
Battery(3v) was changed before the incident (so it worked on the new battery for a while), the original main battery is working and charging.
Ram is same toshiba as I used since I have it (SDR 128 + 64mb onboard) - check foto
it has a IOR bios.... I can probably dump the content but not sure it helps
Reading many stuff online it seems toe be a model issue regarding the GPU RAM (witch is not locate-able on the motherboard , underneath is just the SDR).
Do you have a good bios I can try? I lost my files with bios I had dld when they were still online (I only have the drivers now).

The GPU could use the integrated SDR. But since pressing CAPS LOCK didn't make it's own status symbol appear on the status bar thingy, I suspect something deeper is going on... Normally even with a bad BIOS the laptop should respond to CAPS keypress. Maybe fujitsu did something funny again and chnaged they way this works.

As for the BIOS, I can't find it even on the old fujitsu driver page here.