Acer ES1-571 Winstron no display

[xf0439]

Hello all,

I have an ES1-571 here with no display, hdmi out or boot.
Mobo = Wistron Domino_BH

When pressing the power button the LED, fan and backlight turn on.
Fan behaves as it would in normal situation.

All power stages seem good; resistor for internal GPU enable is there.

Have tried several cleaned bios versions online and later cleaned the original myself but did not make any difference.

Any suggestions?

Schematic here: https://www.badcaps.net/forum/attach...5&d=1552137609

[Sephir0th]

Re: Acer ES1-571 Winstron no display

A) Detailed visual inspection fur burned components

B) CapsLock test with external keyboard

[xf0439]

Re: Acer ES1-571 Winstron no display

Thanks for your message!

A: Visual inspection: I have inspected it again and all looks in great state.

B: CapsLock test: No response at all (there is power on USB ports).

Any other suggestions?

[xf0439]

Re: Acer ES1-571 Winstron no display

The issue seems to be similar to: https://www.badcaps.net/forum/showthread.php?p=886122#7
and I have asked the author of that topic @DeniS182 if he ever managed to resolve his problem.

Since most has been ruled out I suspect it's the processor. I have ordered one of those PCIE debug cards as a 'last resort'; in the hope it will still find something

[Udemzy]

Re: Acer ES1-571 Winstron no display

Fan and backlight turn on,is it screen back light?

A picture of it would have help.

[xf0439]

Re: Acer ES1-571 Winstron no display

Fan and backlight turn on,is it screen back light?

A picture of it would have help.

There is not really anything to see; the screen remains black it's just the black with the backlights powered. I mentioned this to indicate (also confirmed it by measuring) that all the power to the display itself is correct.

The fan turns on for a few seconds and then turns off; once in a while it spins up when needed / as it would do in a normal working situation.

[xf0439]

Re: Acer ES1-571 Winstron no display

Anyone any more suggestions what to check?

[mon2]

Re: Acer ES1-571 Winstron no display

Remove the memory stick and check if the logic board offers a POST beep or LED blink code due to the missing RAM.

[xf0439]

Re: Acer ES1-571 Winstron no display

Already tried but there was no indication of any difference; on this MB there is no buzzer nor LED unfortionately.

I hope is there will be anything useful trough the LPC interface but the connector is unpopulated and I don't have any suitable connector or ribbon cable to solder to it :/

[Duranitron]

Re: Acer ES1-571 Winstron no display

if you have a spare memory that is good try to swap it.

[Ariu]

Re: Acer ES1-571 Winstron no display

i'm having the same issue with this motherboard, all power rails are present,
it turns on but no display.
PLT_RST# 0V
DRAMRST# is pulled low to 0.128V.

Does it mean there is a CPU fault?

[tommy97]

Re: Acer ES1-571 Winstron no display

Do you have any mesurements?

[Ariu]

Re: Acer ES1-571 Winstron no display

As I already mentioned, all power Rails are available, the Problem is PLTRST# 0V
DRAMRST# 0.128V

I muss focus first able on DRAMRST# Signal that is pulled low but I am still confused...