Acer 5738zg Black Screen

[passete]

Hello guys,
i have here a Acer 5738ZG with motherboard JV50-MV DDR3 M92 MB
GPU and Chipset reflowed, all bga are getting Hot but i still get a black screen.
Do you think that i should reflash bios, or it's a waste of time ?

Any help apreciated.

[dellxps15]

Re: Acer 5738zg Black Screen

amd or intel ?

[passete]

Re: Acer 5738zg Black Screen

amd or intel ?

Intel Buddy !

[sopik78]

Re: Acer 5738zg Black Screen

Reflow is a waste of time. Do a reball of GPU or change it and youl'll see. Of course you can try reflash BIOS first.

[dellxps15]

Re: Acer 5738zg Black Screen

i would first try bios . if that doesnt help, i would probably reball the intel northbridge ( if it is the small one, reflow wont help. u have to reball it.

[passete]

Re: Acer 5738zg Black Screen

i would first try bios . if that doesnt help, i would probably reball the intel northbridge ( if it is the small one, reflow wont help. u have to reball it.

As i suspected, no change after bios flash !
Is this the big or small chip ?
Thanks

[dellxps15]

Re: Acer 5738zg Black Screen

umh that looks like an old mainboard core 2 duo. check all coils voltage when it turns on.

[passete]

Re: Acer 5738zg Black Screen

umh that looks like an old mainboard core 2 duo. check all coils voltage when it turns on.

Do i need to measure both contacts of the coil ?
Like black probe on ground and red on both points ?
thanks buddy

[dellxps15]

Re: Acer 5738zg Black Screen

just one pint, as difference is very low voltage change.

[passete]

Re: Acer 5738zg Black Screen

just one pint, as difference is very low voltage change.

I have measured both contacts on all, except L11 and L17, because the heatsink i can't access second contact.
Voltages are not stable at all, almost on all coils.

L10 0,80V 0,81 goes up and down , sometimes was at 1,24V
L11 0,20 can't measure the other side
L17 0,18 can't measure the other side
L19 0,93 -3,38 (- means negative voltage)
L25 1,07 -1,14
L26 1,54 -0,30 Changing value constantly
L27 5,13 3,75
L28 0,48 3,42

Hope you can help me.
Thanks

[dj_ricoh]

Re: Acer 5738zg Black Screen

I have measured both contacts on all, except L11 and L17, because the heatsink i can't access second contact.
Voltages are not stable at all, almost on all coils.

L10 0,80V 0,81 goes up and down , sometimes was at 1,24V
L11 0,20 can't measure the other side
L17 0,18 can't measure the other side
L19 0,93 -3,38 (- means negative voltage)
L25 1,07 -1,14
L26 1,54 -0,30 Changing value constantly
L27 5,13 3,75
L28 0,48 3,42

Hope you can help me.
Thanks

make a high quality picture of the whole board.

[passete]

Re: Acer 5738zg Black Screen

I can also make a photo of a particular component, if needed.

[dj_ricoh]

Re: Acer 5738zg Black Screen

yep.
this weekend i will help you fix it.
mine its the same. mine got the lcd connector broken.
even like that it outputs to external both vga and hdmi.
i keep it to test memory and CPU's

[passete]

Re: Acer 5738zg Black Screen

Where are you dellxps15 ?
Need help guys please.

[dellxps15]

Re: Acer 5738zg Black Screen

if cpu and gpu get hot could be: vga bga problem that need reballing or bad memory ram or bad bios.

[passete]

Re: Acer 5738zg Black Screen

if cpu and gpu get hot could be: vga bga problem that need reballing or bad memory ram or bad bios.

The voltage of the coils that i measured are good ?

[dellxps15]

Re: Acer 5738zg Black Screen

i see no vga core and no cpu core.

how much resistance to ground without any kind of power on l L19 ?

[passete]

Re: Acer 5738zg Black Screen

i see no vga core and no cpu core.

how much resistance to ground without any kind of power on l L19 ?

Both pins give 08,2 ohms to ground
What do you mean that you don't see vga and cpu core ?

[dellxps15]

Re: Acer 5738zg Black Screen

i mean no voltage. u dont have vga core and cpu core voltages.

check cpu vcore ic voltages on all pins. or almost the most important ones.

[passete]

Re: Acer 5738zg Black Screen

i mean no voltage. u dont have vga core and cpu core voltages.

check cpu vcore ic voltages on all pins. or almost the most important ones.

Sorry Buddy, but i'm Learning everyday.
Can you tell me which ic do i need to measure ?