Asus K46C laptop show dotted line display

Model : Asus K46C
Board id : K46CM Rev 2.0

Laptop show with dotted line display. Laptop LCD is good. I already tested with other LCD. But something strange is when connected with external monitor, laptop screen is showing good (no dotted line), but on external monitor, it show with dotted line. Laptop came with Nvidia graphic chip. But in windows only found Intel HD Graphic. There is no discrete to uma change setting on motherboard. but windows only found Intel HD Graphic. Need help.

cygron написав:Laptop show with dotted line display.

Hello!
Please, post a picture of this anomaly.

Measure the voltages to ground on all coils, when the machine is turned on.

Check in device manager box with "view hidden devices" or something like that and check if Nvidia is visible as unconnected device.

cygron написав:There is no discrete to uma change setting on motherboard.

It is available now: post276293.html#p276293

PL8101 - 5V
PL8100 - 3.4V
PL8200 - 1.1V
PL8301 - 1.5V
PL8400 - 1.8V
PL8500 - 0.9V
PL8501 - 0.9V
PL8003 - 0.9V
PL8005 - 0.8V
PL8801 - 3.1V (Wtihout Battery)

Can't find Nvidia Graphic on device manager with show hidden devices.

I know how to disable discrete to uma. I mean laptop came with original (not change to uma) but can't find Nvidia Graphic.

Are there any devices with a yellow triangle symbol in "Device Manager"?

It seems that one of VRAM memory chips is defective. Try resoldering VRAM chips one by one and check each time whether the picture gets back to normal.