Model : Dell Inspiron N4010
Board id : DAUM8CMB8C0 Rev:C

Laptop problem is discrete Graphic Chip. Sometimes no display and sometimes open, but when windows load it's only show gray screen and stop. When i reflow GPU, it's open normal for a while. But after a few minutes, it's happen again. Can i change this model from discrete to uma? I already try these things,

1. Remove PL6
2. Switch R119 to R112
3. Flash BIOS & EC from UMA only model.

When i try to do step 1, 2, 3 - laptop can't switch on.

no UMA GPU->LVDS. Replace GPU.