Member Avatar for rhemanuel2012

I was using my Toshiba Satellite A135-S4478 near a working LCD monitor. All at once, the screen display of the laptop got scrambled and unresponsive. When i forced the laptop off and on again, only the power led comes on. No activity. The screen won't turn on, CPU fan not working. Could this be the cause of radiations from the LCD monitor?

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Short answer: an external LCD nearby is not a plausible cause. The behavior described points at power-delivery, thermal protection, or motherboard fault rather than “radiation” from the monitor. was right to steer the thread away from the external display; 's reminder to check cooling and fans is also relevant because thermal or fan failures can trigger immediate shutdowns.

Practical troubleshooting order (safe, low-cost checks first):

  1. Power basics: remove battery and AC, hold the power button ~30 seconds to discharge, then try AC only (no battery).
  2. Verify the adapter: read the output rating on the adapter and confirm the DC voltage with a multimeter. A failing brick can let LEDs light but not supply steady rails.
  3. Inspect the DC jack and power connector for looseness, burn marks, or wobble.
  4. Minimal-boot test: with the case open, remove removable items (HDD, optical drive, extra RAM sticks, Wi‑Fi card) and try to power with only one RAM stick installed. That isolates shorted peripherals.
  5. Visual check: look for swollen or leaking capacitors, burn smells, or scorch marks around the power circuitry and VRM area. Also check that the CPU fan and heat sink contact are clean and intact.
  6. If the machine briefly starts and then dies, suspect a short or failed regulator on the mainboard rather than the display subsystem.

Safety and next steps: avoid repeated power cycles if you see smoke or smell burning. If you are not comfortable with multimeter work or board-level inspection, a local repair shop can confirm failed power rails or replace the DC jack/motherboard. Given the model age, compare repair cost to replacement before investing in major board repair.

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Member Avatar for JorgeM

I don't think its related to being near an LCD monitor.

Sounds like hardware issue with the laptop.. Could be related to the power supply, motherboard, failure with any component that connects to be motherboard. Hard to say exactly without looking at the device and testing components.

Member Avatar for rhemanuel2012

Ok. I will try testing the components one after the other to see which one does not respond. Funny enough, the power led turns on and remains on. The CPU rans for about 3 seconds and then goes cold. The HDD Led also blinks once and evertything goes cold. But you could hear the usual humming sound of a working motherboard

Member Avatar for mjdodd

Agree with George m, to me it sounds like overheating, which causes nearly all computers, laps and towers to switch off or go cold if they get to hoy. If there is a lot of dust or dirt on cooling fans, of heat sinks this will cause immediate shut down to protect the electronics, check all fans, gratings and heat sinks and ventilation to ensure good airflow
Bol
M

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