hp 2000 -2d11sx white screen problem

[Romy2018]

ohayo gozaimas, I am new to this forum and need help to fix this laptop model HP 2000-2D11SX board id:6050A2493101-MB-A02.the proble is laptop boots fine then a second it turns white screen, I test the screen panel and its working fine on the other laptop.I connect external display the laptop display fine, but when connected to internal display it shows white screen but the screen is fine.Anyone can help me guide to fix this please i dont have schematic for this model.please help me

[caspian]

Re: hp 2000 -2d11sx white screen problem

have you tested the LVDS cable separately?

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

yes i tested with different screen using the same lvds but still the same issue sometimes it boots ok without showing the white screen but after shutting down and turn on again it becomes white screen again.

[caspian]

Re: hp 2000 -2d11sx white screen problem

I meant testing the LVDS cable using another mainboard or testing the current mainboard using another LVDS cable.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

thanks for the response caspian.i did not tried it because i dont have same board to test and no other lvds cable.I only tried test using different screen using same lvds cable but on the other screen there is no problem.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

Is it possible that this white screen cause of lvds cable?

[caspian]

Re: hp 2000 -2d11sx white screen problem

yes, the most probable suspect is a bad LVDS cable or the LVDS cable is not plugged in properly. But, it is also possible that the LVDS cable be healthy and the mainboard has problems.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

@capian i confirmed its mainboard issue because i replaced new lvds cable i got from a working laptop with the same model replaced it still the same issue.could you help me please find the fault

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

i dont have schematic on this board i compared the voltages on the good and working board to this defective board. i check on lvds connector pin1 on the working board it has 3.3v but on defective board there is 0v.and the capacitor connected to lvds pin 1 chip marked 5244 5pin chip on the working board pin3 has 3.3v and on the defective board pin3 0v.the same as ceramic caps connected C572 on working board other side have 3.3v and on defective board both sides 0v. can anyone help me guide to fix this please

[mcplslg123]

Re: hp 2000 -2d11sx white screen problem

That 5 pin IC you are talking about is U501 and PIN 3 is PCH LCDVDD EN signal which should be 3.3v. This signal comes from PCH. So you need to check if there is anything inbetween which is rotten/burnt or simply bad. You are supposed to have 3.3v on all pins except pin2(GND) of U501. You can do the following two things to solve:

01. Remove U501 ic from mainboard and power it on wiyhout lvds cable and measure voltage again on U501 Pins. You will probably have the same voltage on all pins which were there prior to removing this IC- still missing 3v on pin3 will be there. YOU can just jumper with a very thin wire between pin 4 and PIn3 and then switch mb again and measure voltage on PIn3 of U501. This time you are likely to have 3v on pin3. Now turn off and connect lvds cable with screen and probably, your problem will be solved. This happens on Dell N5110 mb also.

02. Alternate method : You cut the PIN1 of LVDS cable and then apply 3v drwan from any other souce from mb directly to this cable. Your case will be resolved.

In fact, Only U501 is more likely to be defective . So The best bet is to replace this IC if you have the same. Else you can try either of the two methods-both method will solve your problem.

Post result.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

arigatou gozaimaz mcplslg123 i measured again without removing the chip pin 5 and pin3 no 3.3v on that chip have 0 volt, i removed the chip and measured again same results pin 3 and pin 5 and pin 3 have 0volt.should i continue to jump a wire from pin4 to pin3?because pin5 of the chip also no 3.3v?

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

need help please

[mcplslg123]

Re: hp 2000 -2d11sx white screen problem

No dont jumper pin4 and pin3 in that case as pin 5 is input of that ic. Put the ic back. Check C599 for short(connected to pin5)

[mcplslg123]

Re: hp 2000 -2d11sx white screen problem

Here is the schematic. Check page 38

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

@mcplg123 sorry my mistake so stupid due to no schematics now i see your schematic ive measured b4 wrong pin,now here is the correct measured pin1 and pin4 have 0v and pin3 and pin5 have 3.3v.and now i have one problem the chip i pulled up is broken.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

need help please

[mcplslg123]

Re: hp 2000 -2d11sx white screen problem

Dont worry friend for that broken chip(you can safely bypass that chip). So you have EN(PIN3) 3.3v and PIN5(IN) 3.3v. So you are having no output on PIN1. Just jumper between PIN5 & PIN1. Hopefully it will work.

[Romy2018]

Re: hp 2000 -2d11sx white screen problem

thank you mcplslg123 i followed your advise i jumper pin 5 to pin 1 now whitescreen not coming back i will observe for a couple of hours and see.thank you again

[mcplslg123]

Re: hp 2000 -2d11sx white screen problem

Glad to help