Hello,

This board came from a failed repair attempt with symptoms of turning on for 3~5 seconds then off, opened and found 2 missing DrMos chips (PU5201 & PU6101) on +VCCGT & +NVVDD1, I don't know what originally happened there..

Put 2 new chips and the board started with the following:

without RTC battery: Turns on / off / Turns on again and keep going on

Fans runs at full speed

Consumption @ 19.5v = Dancing between 1.0A ~ 1.8A then fall to 0.900A (time from start to stabilize = 17 seconds)

+VCC_CORE = 1.0v @ 2.3 ohm (SR32Q) then fall to 0.66v after 17 seconds

+VCCGT = appears after 17 seconds 0.69v and keep on, resistance is 4.3 ohm

+NVVDD1 = 0.77v @ 0.3 ohm (N17E-G1-A1)

without the cooler, the CPU boils to shutdown before the stabilization while the GPU barely heats-up..

no post card in hand, without RAM the LEDs blinks for RAM codes..

The suspect was the GPU, I doubt 0.3 ohms are normal for this chip right ?
it consumes 0.700A from the LB @ 0.80v and no heat was noticeable

I've inspected the chip under the microscope and found 2 micro-cracks in the corners so I can declare it dead, right ?




Now I'm fighting to convert it to UMA and need some help..

Removing GPU power PL6101/PL6102/PL6103 & PL801 has no effect except on the power consumption which dropped..

removed PU6000 - nothing

followed the schematics and moved GPU_ID RH551 to RH552, RH553 to RH554
replace SKU_ID RE125 with 10K
replace Board_ID RE13 with 10K
moved Phase_ID RH547 to RH548, RH549 to RH550
moved DGPU_PWR_EN RH129 to RH127

still nothing..

Bios flash clean / official.. nothing

any help ?
should i remove the chip and try or something wrong in converting ?

UPDATE:

*No diagnostic postcard in hands, using USB flash drive with a LED to test initialization...

1- after modding the bios by setting primary display to IGFX (default=SG) there is activity on the USB, activity stops if the drive removed & re-inserted
no caps-lock/num-lock and no screen...

- there wasn't any activity on the USB before trying to convert to UMA, so the the problem is definitely in the discrete graphics and the board didn't fully convert and fully initialize..
- this activity on the USB appeared after 17 seconds (the exact same period mentioned before, so the board is still looking for the dGPU..

2- discovered that driving DGPU_PWR_EN's 10K resistor from (HIGH=RH129) to (LOW=RH127) has no effect and does not pull the signal down ! DGPU_PWR_EN still 3.2v

any ideas ?