hp all in one model 20-r114la white screen problem

[jonny0404]

hey guys i need help with these intel inside all in one problem is i get white screen on display, i dont see demage on display but i get perfect video by hdmi, question is , you guys think theses is a display problem, i dont se cable flex demage, and i cant find the schematic for these all in one, any one would be kind to tell me any opinion please thanks

[mcplslg123]

Re: hp all in one model 20-r114la white screen problem

Perhaps LCD VDD is missing. You need to check voltage on LVDS pins on mb and compare it with any other mb schematic with similar pin count.

[SMDFlea]

Re: hp all in one model 20-r114la white screen problem

It could be a corrupt EDID .Whats the panel part number .

[jonny0404]

Re: hp all in one model 20-r114la white screen problem

i did some measure on the lvd conector in the motherboard

[mcplslg123]

Re: hp all in one model 20-r114la white screen problem

Your measurements seems strange to me. PIN1,2 and 3 should be together. Check with multimeter are they together or not. If they are together, then thats your LCD VCC line.

[mcplslg123]

Re: hp all in one model 20-r114la white screen problem

DAN91AMB6D0 RevD-Search this schematic on google. It has 30pin lvds connector-so might help you.

[jonny0404]

Re: hp all in one model 20-r114la white screen problem

pins 28, 29 and 30 are together...

[jonny0404]

Re: hp all in one model 20-r114la white screen problem

Connector Pin Assignment

1 RxO0- Negative LVDS differential data input (Odd data)
2 RxO0+ Positive LVDS differential data input (Odd data)
3 RxO1- Negative LVDS differential data input (Odd data)
4 RxO1+ Positive LVDS differential data input (Odd data)
5 RxO2- Negative LVDS differential data input (Odd data)
6 RxO2+ Positive LVDS differential data input (Odd data)
7 GND Ground
8 RxOCLK- Negative LVDS differential clock input (Odd clock)
9 RxOCLK+ Positive LVDS differential clock input (Odd clock)
10 RxO3- Negative LVDS differential data input (Odd data)
11 RxO3+ Positive LVDS differential data input (Odd data)
12 RxE0- Negative LVDS differential data input (Even data)
13 RxE0+ Positive LVDS differential data input (Even data)
14 GND Ground
15 RxE1- Negative LVDS differential data input (Even data)
16 RxE1+ Positive LVDS differential data input (Even data)
17 GND Ground
18 RxE2- Negative LVDS differential data input (Even data)
19 RxE2+ Positive LVDS differential data input (Even data)
20 RxECLK- Negative LVDS differential clock input (Even clock)
21 RxECLK+ Positive LVDS differential clock input (Even clock)
22 RxE3- Negative LVDS differential data input (Even data)
23 RxE3+ Positive LVDS differential data input (Even data)
24 GND Ground
25 NC No connection (for AUO test only. Do not connect)
26 NC No connection (for AUO test only. Do not connect)
27 NC No connection (for AUO test only. Do not connect)
28 VDD Power Supply Input Voltage
29 VDD Power Supply Input Voltage
30 VDD Power Supply Input Voltage

[ktmmotocross]

Re: hp all in one model 20-r114la white screen problem

u did not see the fault?

[mcplslg123]

Re: hp all in one model 20-r114la white screen problem

pins 28, 29 and 30 are together...

Ok, so PIN28/29/30 is your VDD pin. It should be close to 19V there if this model runs from ac adapter. Check the fuse connected to that pin.

[jonny0404]

Re: hp all in one model 20-r114la white screen problem

yes the fault is vdd was missing on display and is 5v not 19v is very strange, thank you guys.