Acer e5-511 with black screen.

[asem18]

Hello folks.
acer e5-511 ( la-b211p ) black screen , i have picture on external monitor .
changed ram same issue..flashing bios too..i change display cable and display same issue .

all the voltage are ok ..
PL402 =+3VALWP = 3v
PL404 = +5VALPW = 5v
PL502 = VP = 1.3v
PL802= CPU soc vnn = 0.7v
PL803 = CPU soc vcc = 0.8v
PL602 = +1.0VALWP = 1.0 v
PL302 = BATT+= 3v
Pin 8 bios = 1.8v
PLTRST = 3.3v
DRAMRST = 1.385v
VTT = 0.690v

JLVDS conncetor :
1.23 = 19v
6 = INVT_PWM_SOC = 0.013v ( t think this is my pb ! )
7 = EC_BKOFF# = 0.029v
9.10 = +LCDVDD = 3.3v
11 = TS_EN_1 = 3.3v

U64 :
Pin 2 = DDI1_PWM = 0v
Pin 4 = INVT_PWM_SOC = 0v
Pin 5 = +1.8VS

What should i check too !!

[piernov]

Re: Acer e5-511 with black screen.

Image on internal display? Lid switch working?

[asem18]

Re: Acer e5-511 with black screen.

Thank you Piernov for your help.
as i say before : black screen ...but on external yes ther's picture
lid switch on power button is OK

[Techtiger]

Re: Acer e5-511 with black screen.

Test ENBKL U61 , ENVDD & PWM single comes from SOC 1.8V

[asem18]

Re: Acer e5-511 with black screen.

Thank you techtiger , U61 didn't exist on this mobo...only U62 and U64

[piernov]

Re: Acer e5-511 with black screen.

Image and backlight are not the same thing, you could have image but no backlight, or no image and no backlight at all (in this case the problem is less likely to be in the backlight circuit).

[asem18]

Re: Acer e5-511 with black screen.

i know piernov , but here i don t have no backlight . no image...it looks like i haven t screen...nothing happen on it...no dim picture too

[SMDFlea]

Re: Acer e5-511 with black screen.

RP45 ? 100K Ohm

[asem18]

Re: Acer e5-511 with black screen.

Thank you SMDflea , no it's 40 kohm.

[SMDFlea]

Re: Acer e5-511 with black screen.

It should be 100K.Repalce it if you have one on a donor board.

[asem18]

Re: Acer e5-511 with black screen.

Change Pr45 , but still same issue .
taken other measurment on jvlds :
6 = INVT_PWM_SOC = 13.2mv
7 = EC_BKOFF# = 24.7mv
8 = EDP_HPD_CONN = 4mv ( must be 2.5v !)

[Techtiger]

Re: Acer e5-511 with black screen.

Check LVDS SDA SCL after check the resistance to GND and the voltage LVDS 31 32 28 29 25 26 and U64 pin 2 4 resistance to GND

[asem18]

Re: Acer e5-511 with black screen.

Thank you techtiger for your help.
U64 resistance to ground on diode mode :
PIN 2 = 0.542v
Pin 4 = 0.577v

LVDS :
Pin 25 = Changing from 0.600v to 0.800v
Pin 26 = 0.900v and increase
Pin 28 = 0.476v
Pin 29 = 0.400v and increase
Pin 31 = 0.640v and increase
Pin 32 = 0499v and increase

Pin 21 = SDA = 2.2mv ...Diode mode = 0.030v ( it bips)
Pin 22 = SCL = 0.45mv....Diode mode = 0.387v.

[Techtiger]

Re: Acer e5-511 with black screen.

Thank you techtiger for your help.
U64 resistance to ground on diode mode :
PIN 2 = 0.542v
Pin 4 = 0.577v

LVDS :
Pin 25 = Changing from 0.600v to 0.800v
Pin 26 = 0.900v and increase
Pin 28 = 0.476v
Pin 29 = 0.400v and increase
Pin 31 = 0.640v and increase
Pin 32 = 0499v and increase

Pin 21 = SDA = 2.2mv ...Diode mode = 0.030v ( it bips)
Pin 22 = SCL = 0.45mv....Diode mode = 0.387v.

SDA 0.030 Ohms data line this Signal comes from SOC page9 1.8VS

[asem18]

Re: Acer e5-511 with black screen.

yes techtiger..i trace his line..SDA_PNL come from Q80 pin 3 that don't exsit on mobo .
Q80 :
Pin 1 = 1.8v
Pin 2 = 1.8v
Pin 3 = 5.8mv
Pin 4 = 1.8V
Pin 5 = 1.8v
Pin 6 = 40mv