Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

[ala_borbe]

hi ppl

i need a bit of help to figure out this board

its Fujitsu Amilo LI3910 with board DA0EF7MB6D1

i had board which was shorted a played with it and burn it right, no help there but can be used as donor

got me a new board for 7.5 euro but its not working, ofc

laptop turns on, no image on screen, does not respond to caps lock or num lock
tried another cpu, ram, vga out, nother screen.. nothing

then i checked coils, all have voltage, 19v 5v 3.3v
intel gm40 heats a bit but has heatsink but i suspect its ok
tried to reflow a bit with low temp, all same...
i flashed bios from another thread, no change, all same...

since i have donor board with other problem (dead like rock) maybe you could guide me to fix this board or detect problem... please

one more thing, in regular interval (5sec) i hear tik sound and fan spins a bit slower for like 1/4sec... like it rebooting :-/

also, battery is charging

[meritosari]

Re: Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

Did you get voltage on VCC_CORE?
- Also check signal VR_PWRGD_CK410#, ECPWROK, PM_ICH_PWROK.
- I didn't know where the pin to check signal for dramrst for DDRII. Mostly Power On Sequence only for DDRIII
- Try to hear the tik sound at midnight, may be it will be a "clue".
- If all voltages and signals are present, but No display. If so, then I think is the hardest things on laptop repair (for me ). May be related with SB and NB.
- Wait for another suggestion from the expert

[ala_borbe]

Re: Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

hello and thank you for response

on PL12 = VCC_CORE without cpu 1.5v with cpu 1.1v when on
on U7 0MC74VHC1G pin2 = ECPWROK is 3.3v
on U7 0MC74VHC1G pin4 = PM_ICH_PWROK 3.3v
on PU7 ISL6262A pin47 = VR_PWRGD_CK410# 0v

should i replace isl? need to find spare...

[ala_borbe]

Re: Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

ok changed known good ISL6262A from some dell board that was turning on and display image on vga but not display, so isl should be goood

anywas after replacing its all the same, nothing changed, pin 47 still 0v so no VR_PWRGD_CK410#

[ktmmotocross]

Re: Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

CLK_EN# - Digital output for system clock. Goes active 13
clks after Vcore is within 10% of Boot voltage.

[ala_borbe]

Re: Fujitsu LI3910 DA0EF7MB6D1 fan spins, no image, pls help

As mentioned in “Theory of Operation” on page 16,
CLK_EN# is logic level high at start-up until approximately
43µs after the V CC -core is in regulation at the Boot level.
Approximately 43µs after V CC -core are within regulation,
CLK_EN# goes low, triggering an internal timer for the
IMVP6_PWRGD signal. This timer allows IMVP-6_PWRGD
to go high approximately 6.8ms after CLK_EN# goes low

so this is fine...
i think GL40 is dead cos i have 0v on C1 pin on cpu socket
H_CPURST# should be 1v but for me its 0v