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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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Though i dont have the schematics but i think PL1203/04 is for vcc core and PL802 is GFX core. So the voltage seems to be ok. Are you getting PLT RST?? -
Re: Acer E5-571G Black Screen (a5wah la-b991p)
I upload the schematic, https://anonfile.com/k7cfjbkebe/comp...lab991pr10_pdfComment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
measured plt_rst on pin 13 of kbc and result 3,30vComment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Any help please...Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
You need to measure PU801 voltage on all pins. Pl1203/4 are expected to heat-so nothing to worry there. Since you are getting PLT_Rst means almost all power up seqeunce reuirement are fulfilled.Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
pu801:
pin 1 1,04v
pin 2 1,04v
pin 3 0v
pin 4 1,04v
pin 5 1,67v
pin 6 2,00v
pin 7 1,74v
pin 8 0v
pin 9 1,80v
pin 10 1,80v
pin 11 0v
pin 12 5,04v
pin 13 7,57v
pin14 8,14v
pin 15 8,21v
pin 16 4,40v
pin17 0v
pin18 1,04v
pin 19 1,04v
pin 20 1,04Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
is correct value?Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
pin 121 3,3vComment
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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.Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Good afternoon friends of the forum. I replaced PU801 but the defect remains. on pin 1 of pu801 I find 1.05V. Other suggestion?Comment
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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.Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Is it possible to convert UMA removing by PL1201 or not? Do you have any idea to convert discrete to uma by any other method? Thanks in advance.Comment
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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 humanlyComment
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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 youComment
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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.Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Pu801,pin1 voltage at 1.05v is correct. Have u flashed bios?? What about U43?~Comment
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Re: Acer E5-571G Black Screen (a5wah la-b991p)
Thank you my friend.
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.Comment
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