MATRYCA INNOLUX N156BGE-L11 BRAK PODŚWIETLENIA LED

Witam,
Posiadam matryce INNOLUX N156BGE-L11.


Jest obraz natomiast brak podświetlenia.
Matryca sprawdzana na 100% sprawnej taśmie i innym laptopie.
Czy może ktoś miał już taki problem?
Jest szansa naprawy takiej matrycy?

Hello!

Please, post a clear picture of the following board area.

Hi!

matic написав:Please, post a clear picture of the following board area.

Check the fuse F2.
Measure the resistance on capacitor C66.

matic написав:Check the fuse F2.

The fuse F2 is good.

matic написав:Measure the resistance on capacitor C66.

The resistance is about 550 kOhm

Specify the QFN chip markings.

matic написав:Specify the QFN chip markings.

DW=1J PJS

I have similar working LCD screen and checked in these two points a have about 26 V after start.
In bad LCD in the same points I have only 19 V.

Bezel018 написав:I have similar working LCD screen and checked in these two points a have about 26 V after start.
In bad LCD in the same points I have only 19 V.
[ Obrazek ]

It is obvious, because the boost DC/DC converter does not start.

Measure the voltages to ground on pins 1, 6, 16, 19, 23, 24 of QFN chip.

matic написав:Measure the voltages to ground on pins 1, 6, 16, 19, 23, 24 of QFN chip.

1 - 4,7V
6 - 1,98V
16 - 0,73V
19 - 19,18V
23 - 0V
24 - 0,10V

Measure the resistance on capacitor C70.
Measure the voltages to ground on both pins of resistor R95.

matic написав:Measure the resistance on capacitor C70.

18 Ohm

matic написав:Measure the voltages to ground on both pins of resistor R95.

the left side = 19,18V (side next to F2)
The righit side = 0V

Bezel018 написав:

matic написав:Measure the resistance on capacitor C70.

18 Ohm

Remove the capacitor C70 from the board and remeasure the resistance.

matic написав:Remove the capacitor C70 from the board and remeasure the resistance.

Still the same - 18 Ohm

QFN chip and resistor R95 are bad for sure - replace them.

QFN= RT8562B
R95= 10Ω/5%, package 0402

Hi,
After replaced the both of elements LCD working correctly.
Thanks!