Good evening friends of the forum. This laptop has the following problem: it turns on but I get a black screen. Think of a dedicated gpu problem (n15-v-gw-s-a2) Replaced video card but the defect remains. I tried Changing ram, reprogram bios, but nothing. I noticed that the coil pl1203, pl1204 and pl 802 are heating a lot. On pl1203, pl1204 I find the voltage of 1.01V and on pl802 I find 1.80v on one side and on the other I get 0.40v. I suspect this is the integrated graphics in the chipset but I wanted your opinion
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Acer E5-571G Black Screen (a5wah la-b991p)
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
I upload the schematic, https://anonfile.com/k7cfjbkebe/comp...lab991pr10_pdf
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
So kbc seems to give VR_ON output correctly but still you are having 1.04 at pin1 of PU801. You need to check resistors, caps connected to PU801 and match them with schematic. Is PU801 soldered properly? Any corrosion, missing tracks?? If everything seems good, you can try replacing PU801.
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Unfortunately, in these cases, when attempts are made; problems may increase.
Personally, I would try to bring the situation back to its initial state,
change the bios with the original, check that there are all the correct voltages and try to reprogram the EC.
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
can you try? " Acer E5-571G A5WAH LA-B991P Rev 1.0
When the solder on the PJ1002 jumper feeding the RAMs on the left side of the GPU is cleaned and the U40 mosfet located on the right side of the GPU is removed, the Nvidia graphics card is disabled. "I'm not happy to be so strong. because it's not humanly
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Hello friends ...got the same motherboard with same issue .
When power on i got a backlight but no picture , i have picture at external .
All the voltages are present , plt_rst too , Vr_on too...but at pin 1 of PU801 got 1.04v.
I also do a uma enable as Post18 mention but same isse.
At lvds connector all voltages are present expect : INVTPWM / DISPOFF# / EDP_HPD = 0v.
Change screen same too
What i must check too !
Thank you
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Update :
pu801:
pin 1 = VR_ON = 1,052v
pin 2 = PGOOD = 1,052v
pin 3 0v
pin 4 1,052v
pin 5 1,8v
pin 6 2,00v
VR_ON is coming from U1L (CPU) there's a resistor (Not populated) R167 = 1.05v at 2 pads.
The VGATE_3V is coming from U17 (Not populated )
U17 pads
pin 2 = 1.05v
pin 5 = 1.05V
pin 4 = VGATE_3V = 0v
VGATE source !Last edited by lapfix; 03-02-2022, 06:54 AM.
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Originally posted by mcplslg123 View PostPu801,pin1 voltage at 1.05v is correct. Have u flashed bios?? What about U43?~
Since i have a picture at external so i think no need to flash bios !
But i do a clean me and flash new virgin dump , same issue , only external and a backlight at internal as i mention before.
U43 not populated :
1 = not stable = 1.7v or 0.043v or 1.8 with fluctuation at 1 or 0 v
2 = 3v
3 = gnd
4 = 3.2v
5 = 3.3vLast edited by lapfix; 03-03-2022, 03:20 AM.
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