Member Avatar for hemantrw

Hi friends !

I have a laptop model: Fujitsu Siemens (Amilo La1703). From last few days, it started giving problem of "Automatic turn off". Even screen used to flicker sometimes.

I guessed it might be the problem of "Overheating". I decided to apply some thermal paste to CPU and clean the fan. So I opened it (after removing battery and AC power) and removed the dust with "Air Blower". I applied some "circuit cleaning solution" and cleaned the fan. When I was trying to get the CPU out, I found that it is fixed with heat sink and will not come out. I just closed the cover.

Now, when I plugged the power source again and turned the power button on, I noticed that laptop is not even showing "start up BIOS messages". Fan is working. I connected it to external monitor to see if laptop screen might not be showing output, I found that even external monitor is not showing anything.

I also noticed that ...

1. When I press the power button to start the laptop. Power led gets ON continuously.
2. When I connect AC supply, AC led gets ON continuously.

BUT...

3. The led that shows "Process and Loading (I don't know what is it said), I see that for two times it blinks and then gets OFF.

I fear if it is problem of CPU. What may be the cause of such problem ? Please help me in solving this issue.

Regards

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  • Latest Post Latest Post by hemantrw

Dani AI

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A focused troubleshooting note to complement and : before assuming a CPU fault, follow a short, ordered checklist that targets the far-more-common causes (power delivery, memory, BIOS/cabling) and preserves evidence if the machine is to be handed to a shop.

  • Power sanity: verify the AC adapter actually puts out the voltage shown on its label, and inspect the DC jack for looseness or damaged solder joints. With battery removed, perform a power‑drain (hold power 20–30s) then try AC only. If comfortable using a multimeter, check the primary board rails; otherwise leave this to a technician.
  • CMOS/BIOS recovery: try a CMOS clear (remove the coin cell for several minutes or use the motherboard jumper) to rule out a corrupted BIOS.
  • Memory and minimal‑boot test: reseat RAM and test one module at a time in each slot; remove HDD/optical/PC cards and try a minimal configuration to provoke POST/beep codes. If a system speaker or documented LED blink pattern exists, consult the service manual for that model to interpret codes.
  • Connectors and fasteners: inspect every ribbon and power connector, and confirm screw lengths/standoffs — a misplaced long screw can short a trace as warned. Look for bent pins in sockets or partially seated cables under the heatsink assembly.
  • Visual inspection: strong signs (bulging caps, scorch marks, corrosion, or residue from cleaning liquids) indicate board-level damage. Note any unusual smells.
  • CPU reality check: determine whether the CPU is socketed or BGA‑soldered. BGA replacements require specialised reflow/reball equipment and are not a routine swap.

If these steps don’t isolate the fault, document what was tried and consider a reputable repair shop that can scope power rails and read POST codes. In many laptops the root cause is power or memory circuitry rather than the processor itself, so motherboard-level diagnostics are the safer next move.

Recommended Answers

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Member Avatar for Rik_

Did you make sure that the different length screws went back into the correct places?
The reason I ask this is because I fixed a Dell sometime back that the owner had taken apart. He had fitted a longer screw in the wrong place and it touched and shorted out a component on the motherboard!

Member Avatar for hemantrw

Thanks for your reply. While opening I had noted from where I removed which screws and fixed them in the same manner. I will look it again but I don't think it was wrongly fitted.

Member Avatar for Rik_

Also, make sure you didn't miss any connectors!

Member Avatar for toplinecar

if you did wrong connection in between the circuits it will show this problems. there are different settings for different laptop manufacturer companies. so check whether setting of your laptop is changed.

Member Avatar for hemantrw

Sorry for not being on the discussion for long. Well...I found that it might be processor problem and as I did not have that kind of processor, I returned the laptop back to the customer.

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