compaq cq40-108tu no POWER!!

[ry x hunter]

hi guys.. i have problem with this compaq laptop.. no any lights indicator even in the charging light near dc plug.. i check dc-in and voltage came in is ok.. 3v,5v working.. but i confused when i checked bios ic u27 on schematic.. pin 1,2,6 was fluctuating.. but here is other scenario ive encountered when i press windows key and "b" charging indicator light is ok and when i press power it turn on but no display on the screen.. any sugestion how to resolved this problem

[Cles]

Re: compaq cq40-108tu no POWER!!

hello, rewrite the bios ok?

[whaldsz]

Re: compaq cq40-108tu no POWER!!

1. check RSMRST# in SIO chip.
a. If you get 3.3v (on or after power button press) then BIOS could be working normally.
b. if no 3.3v, you need to reflash your SPI BIOS chip, chck SIO and crystal if 32.768kHz oscillation is being generated.

2. check if PLTRST# (pin 22 of mini pci slot) for 3.3v after power button press.
a. if you get 3.3v, you probably need to reball/replace the MCH chip.
b. if no 3.3v, you probably need to check/reball the ICH chip.