ACER SF314-58 power on but no picture

[mmate]

Hello All,

Need your advice with troubleshooting ACER SF314-58 (STRONGBOW WHL MB 18721-1). Motherboard is coming on but without picture.

BIOS flash with dump from this forum - same issue.

Resistance on coils:
PL5301 - 43 kOhm
PL4401 - 150 kOhm and going up
PL5201 - 29 Ohm
PL5001 - 33,5 Ohm
PL4701 - 6,8 Ohm
PL4702 - 6,8 Ohm
PL4801 - 13,8 Ohm
PL4502 - 100 kOhm
PL5101 - 220 Ohm

Power consumption after power up is around 400mA, in power off 40mA

[mcplslg123]

Re: ACER SF314-58 power on but no picture

Resistance to GND seems more or less ok. What about the voltage? Offline consumption at 40mA however doesnt seems correct to me.

[rex98]

Re: ACER SF314-58 power on but no picture

Replace the built-in RAM.

[mmate]

Re: ACER SF314-58 power on but no picture

Voltage on all coils after power up are ok, except VCCGT, but I assume its normal.

Is it possible to check bulit-in RAM or disable it?

and one correction, standby consumption is around 10mA.

[mcplslg123]

Re: ACER SF314-58 power on but no picture

Going by post#4, everything seems ok. Have you tried flashing clean me bios?

[mmate]

Re: ACER SF314-58 power on but no picture

I try flash bios, but its hard to find right dump for model sf314-58.
When I used BIOS extracted from Acer website - board didnt power on.
But I dont have 100% working dump file to check it...

[mcplslg123]

Re: ACER SF314-58 power on but no picture

Its very unlikely that bios from acer website wont work. maybe you didnt cut the file appropiately. Post your request in bios section and someone will help you. Lets rule out bios first.