Member Avatar for skytang

Dear Sir/Madam,

Yesterday my laptop won't boot and there was no battery indication even if I plugged in my A/C adapter, even with my
normale battery (charged, i think). It wouldn't boot, does someone know how I can fix this?
I heard it could be fixed with an power board but I really don't know how it looks like from this laptop.
Thanks in advance!

Sky

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  • Latest Post Latest Post by johhny-marshal

Dani AI

Generated

Practical troubleshooting notes for a Sony VAIO VPC-Y21S1E that shows no LEDs and will not boot. Replies from and point toward power/charging hardware, and ’ experience visiting a technician is a common outcome. With warranty expired and cost sensitivity noted by , a staged, low-cost diagnostic approach is recommended before replacing the motherboard.

Low-cost checks, in practical order:

  • Power‑drain reset: remove the main battery and AC, then press and hold the power button 30-60 seconds to discharge residual charge. Reconnect AC only (battery still out) and watch for any adapter or chassis LEDs.
  • Adapter verification: read the adapter label for its rated DC output, then measure it with a multimeter (DC volts) between centre pin (positive) and outer sleeve (negative). A reading close to the label means the adapter is delivering power; zero or noisy readings indicate adapter failure.
  • Try a known-good compatible adapter (same voltage, equal or higher current rating, correct polarity) if available — many “no power” cases are a dead adapter.
  • Inspect the DC jack and cable for looseness or damage. Many VAIO designs use a small DC‑in/daughterboard; if present that board is often far cheaper to replace than the mainboard.
  • If comfortable opening the case: with power removed, look for burnt marks, bulging capacitors or a blown SMD fuse near the input. Continuity or voltage checks at the input fuse reveal where the rail stops.
  • Reseating/removing RAM and drives is a quick, low-risk check, but a total lack of LEDs usually indicates a power-rail fault rather than memory.

Cheapest repairs are usually adapter or DC‑in board replacement; mainboard faults tend to be the costliest. A local shop’s small diagnostic fee can avoid unnecessary part purchases or confirm whether a donor board or part swap is viable. Multimeter readings and the exact adapter label values are the most useful data for further diagnosis. Safety note: always remove battery and AC before disassembly, use basic ESD care, and seek professional help if unfamiliar with board‑level work.

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Member Avatar for jsherm101

if you cant get it to post (ie make it to the BIOS) then it's 90% of the time your motherboard, or your power supply, especially when using it with A/C

try to plug in a different A/C adapter, otherwise your laptop is kaput.

It's really inefficient to try to change out the power supply and BIOS for a laptop without using your service provider, and in most cases cheaper to just buy a new laptop

Member Avatar for kevin2s

This is a great problem which I have aslo suffered but I did directly go to the laptop technician

Member Avatar for skytang

The warranty is already gone and if you bring it to a service provider it would cost a lot and takes very long before it has been repaired. Then again an older laptop would bring more cost then a new one if the repair is changing an motherboard of the laptop.
So I would like to know the cheapest way to fix it?

Member Avatar for jsherm101

to buy it and DIY - good luck.

Member Avatar for Emilyalice

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Edited by Emilyalice
Member Avatar for johhny-marshal

The problem seems like tha AC charger has gone. Have you tried any other charger ? Try if not. The problem might be associated with the MB also.

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