Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

[tizac]

Problem with Laptop keyboard so replaced (No battery or AC connected during replacement)

Laptop booted fine first time, LCD display is now white but VGA and HDMI on external are fine

what Ive tried:

1. Checked cable seated and in place on MB (Still White)
2. Checked cable seated and in place on LCD Panel (Still White)
3. Reseated Ram and Cpu (Still White)
4. Test another Know working LCD Panel (still White)
5. Replace with new LCD cable (still White)
6. Reflowed GPU - (Still White)

If I connect either HDMI or VGA they display on external fine. What I have noticed is when these are connected the display turns from white to black but still no display

Power off I get voltages as
19.6v @ pins 1;2 & 3

Power On I get voltage as

19.6v @ pins 1;2 & 3
3.3v @ pins 7 -11 & 37

Any input would be very much appreciated

[tata123]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Check the Filters near LCD Connector!!

[cyberhack]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Look inside the connecter for damage

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Connector was checked and had no damage.

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

tata123 - filter to which pins

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Ive measure the voltages in the area, can someone confirm if Q65 or Q17 are the problem as the backlight is working just no display on LCD

[tata123]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Hey check the filters with the L !!

Schematic?

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

L12 & L13 reading 19.6v each side

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Schematic added

[tata123]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Hey check R16, R731, R307, R733, R734, R736, R735

[whaldsz]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Do you get 3.3v at pin 5 of JLVDS1?

[ktmmotocross]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

reball

[tizac]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Yes, voltage 3.3v at pin 5

Do you get 3.3v at pin 5 of JLVDS1?

[bios77]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Vga chip problem

[ktmmotocross]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

just give gpu little heat to 100c andd u will see if lcd comes

[TVRepairNoobie]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

tizac, was the LCD display working before the keyboard replacement?

Does it post at all or do you get a white screen as soon as you turn the laptop on?

[whaldsz]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

Yes, voltage 3.3v at pin 5

Before you suspect the GPU, try:

1. with another lcd screen
2. flex cable

[quyenlaptop]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

have you bios Acer Aspire 5741 - New70 - LA-5892P

[kalimuthu]

Try ec-bios reprogram

[shibu]

Re: Acer Aspire 5741-A - White Display Problem - New70 - LA-5892P

q17 shot the pin source and drain it the 3.3v lcd vcc maybe a little leakage display will coming white or black