Acer Travelmate P248-m Series Power on Problem

[vhin02]

Hey guys, hope someone could help me in troubleshooting this laptop. It seems that it has a power and turns on with no output then turns off after few seconds. I already tried to re-flash the bios hope that it would be the problem. I guess I need help with this matter. thanks folks.

[emestee]

Re: Acer Travelmate P248-m Series Power on Problem

Before anything else, have you tested the CMOS battery?

[vhin02]

Re: Acer Travelmate P248-m Series Power on Problem

not yet sir. should I disconnect it first?

[vhin02]

Re: Acer Travelmate P248-m Series Power on Problem

It has 0.06 volts

[stingerchamp]

Re: Acer Travelmate P248-m Series Power on Problem

CMOS battery or rtc cell should be above 2.8 voltage

Replace it , check outside voltage at CMOS cell

Without CMOS battery laptop will restart automatically for three times and fourth will boot

[vhin02]

Re: Acer Travelmate P248-m Series Power on Problem

ok thanks. i'll try this one

[vhin02]

Re: Acer Travelmate P248-m Series Power on Problem

I tried to remove the CMOS battery and replaced it but still doesn't work. maybe there's a different cause of it?

[stingerchamp]

Re: Acer Travelmate P248-m Series Power on Problem

When it turns on fan spins?

Share schematic

Check frequencylevel at crystal oscillator using
oscilloscope or DSO

Confirm rtc section rtc_rst# and secondary srtc_rst#