Acer Aspire 5 A515-51G power on but black screen

[kilometrs]

Correct the double-posting please.
After switching the onboard ram off and flashing mcplslg123's bios file from this thread, laptop started working again!

[kilometrs]

Sorry for double-posting.
PLT_RST# and DRAMRST# are both 3.33v for me. Switching onboard ram by moving resistors also didn't seem to work. Flashing latest bios. Same symptoms. Haven't tried UMA switching yet.

[kilometrs]

resistor83 Have you managed to find the problem? Only I have 1A version instead of 1C.

[Jmine]

Re: Acer Aspire 5 A515-51G power on but black screen

well, maybe i found the problem. As I wrote a few posts back, there are no voltages on VCC_GT and therefore also on the PL906 coil

By measuring the PQ906 chip I discovered that pin 2 has 19v while pin 1 has 0v

The same chip (PQ1202 and PQ1201) is also present in the area of the dedicated video card and measures them 1,12v


Do you think I should change PQ906?

I think vcc gt doesn't turn on at these stages. It only turns on when graphic intensive program is run on the windows.

Someone correct me if I'm wrong.

Edit : Sorry. Piernov had already mentioned that.

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

Hi, no :\
Have you same problem?

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

Anyone please?

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

Thanks for the info.
Could someone tell me what measurements I could do?

Thank you

[piernov]

Re: Acer Aspire 5 A515-51G power on but black screen

https://logi.wiki/index.php/User:Pie..._I_solve_it.3F

I am missing VCCAXG/VCCGFX/VCCGT (iGPU core voltage), how do I solve it?

The iGPU core voltage is almost never relevant. It typically only comes up when there's a significant load on the iGPU. It can often be seen spiking a couple of times on the oscilloscope when POSTing.

In other words, it's generally normal that it's missing. If you have some kind of issue with the machine, the cause is most likely elsewhere.

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

well, maybe i found the problem. As I wrote a few posts back, there are no voltages on VCC_GT and therefore also on the PL906 coil

By measuring the PQ906 chip I discovered that pin 2 has 19v while pin 1 has 0v

The same chip (PQ1202 and PQ1201) is also present in the area of the dedicated video card and measures them 1,12v

Do you think I should change PQ906?

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

I read on some forum that for UMA conversion you have to move RC134 to RC133

I tried to move it but the problem is still there, the only thing is the absorption from 0.50A drops to 0.42. I guess because the video card is actually disabled

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

could it be the video card?
UMA?

[mcplslg123]

Re: Acer Aspire 5 A515-51G power on but black screen

I said what it looked like from pics. Your later pics confirm that you did it right. Sorry, i've no imore idea.

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

why do you say 4 resistors?

below i put a "before and after" picture and you can see i moved only ID0, ID2 and ID3

[mcplslg123]

Re: Acer Aspire 5 A515-51G power on but black screen

It seems you have shifted 4 resistors instead of 3 mentioned at post#17. Only those 3 needs shifting and rest untouched. Double check your work.

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

You are sure you moved the correct resistors. Double check them with boardview. You put a ram stick on the slot-right?

yes, I moved the resistors correctly (see photo), I also tried to put another ram module but nothing

[mcplslg123]

Re: Acer Aspire 5 A515-51G power on but black screen

You are sure you moved the correct resistors. Double check them with boardview. You put a ram stick on the slot-right?

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

I moved the resistors but I still don't see anything on the screen, I only noticed that the slight flashes are gone, only one when I press the power button

can i do some other measurements?

[mcplslg123]

Re: Acer Aspire 5 A515-51G power on but black screen

RAM ID_0/2/3 needs to be pulled to "1" This means shifting
RC155 to RC151
RC226 to RC153
RC227 to RC224

Boardview will help you locate these resistors.

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

Correction: ID3, ID2 and ID0 must be moved to the right in my photo, is correct?

[resistor83]

Re: Acer Aspire 5 A515-51G power on but black screen

I wanted to ask if I'm thinking right:

the ram module is samsung so i should move the resistor that is on ID1 to the left, right?