ASUS gtx960 graphics card does not light up for Repair

ASUS gtx960 graphics card does not light up for Repair

Graphics card model: gtx960-dc2oc-4gd5-si
Fault phenomenon: the graphics card point is not bright

Maintenance process:

A ASUS gtx960, the power on test point is not bright, after measurement, the graphics card has no core VCC.

ASUS gtx960 graphics card point not bright Repair Figure 1. 
The EN of up1608tk is 3.3V.

ASUS gtx960 graphics card point not bright Repair Figure 2.
Measure whether the working conditions of up1815p are normal, send out the reference VCC, s74a silk screen error code, and the corresponding model is up1815p.

ASUS gtx960 graphics card point not bright Repair Figure 3. 

Refin and refin were measured.
REFIN：0.9V

REFOUT：0.03V

ASUS gtx960 graphics card point not bright Repair Figure 4.
It is obvious that s74a (up1815p) is broken and replaced by S74.

ASUS gtx960 graphics card point not bright Repair Figure 5.
Replace the core VCC.

ASUS gtx960 graphics card point not bright Repair Figure 6.
Core VCC has been generated.Power on,Normally booting up.

ASUS gtx960 graphics card point not bright Repair Figure 7.