Dell inspiron 5520, 7 beeps problem

[mohamed mm]

Hi,
I've an Inspiron laptop model 5520, board name, la 8241p, with a 7-beep problem.
exist voltage:
PL 200:3.3v
PL 201:5v
ram volt PL300: 1.5v
PL600: 0.9v
PL500: 1.0V
PL 202: 19V

Processor section:

PL701: 1.2V
PL702:1.2V
but PL704: 0.0V
and PQ705 / PQ706 are zeros on gate/drain and source.
PC724/PC712 : 19V.

bios volts:
EN25QH16 / EN25Q32B: 3.3v.

I tried to program a (W25Q32B) BIOS chip with an (EN25Q32B) BIOS dump from the internet, but during verification, it says ('buffer data does not match SPI chip)

What's been done: RAM replaced, processor replaced, battery replaced — but the issue remains. I've tried to program the BIOS using multiple software tools (AsProgrammer 2.1.0 / CH341A / NeoProgrammer 2.2.0.10), but it only shows FF (empty data), which might mean the chip is protected. I'm not sure. The laptop powers on and gives 7 beeps, with no display or keyboard response, and then shuts off after some time.

[SMDFlea]

1.8VS checked ? .Find some clean bios versions in the bios requests forum and flash them.

[mohamed mm]

in PL400: 1.8V
Ok, I'll search for the BIOS and then update you.
Thank you.