ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair

ASUS H110M-F 1.01 VPPDDR does not light up, replace the chip, remove PU502 and PL502, and solder 1117.

Machine model:ASUS H110M-F 1.01

Fault phenomenon: the machine does not light up

Repair process: after receiving a customer’s mainframe that does not light up, it is tested that there is a problem with the motherboard, and it is removed.

ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair Figure 1.

ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair Figure 2.

The measured VPPDDR voltage is abnormal. The voltage also jumps up and down at 2.2-2.5V after chip replacement. This type of board is easy to bulge at this position. So let’s just change it to 1117. I found a 1117 fixed voltage 2.5V chip in the accessory box, as shown in the figure:

ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair Figure 3.

The chip is a 1117 adjustable model. We just need to ignore that R1 is not installed, and R2 is not directly connected to GND. Next, remove the PU502 and PL502, weld the 1117 2.5V to find the+5vsb, connect it to the 1117 VIN pin and the grounding pin, and slightly lift up the next two feet, as shown in the figure:

ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair Figure 4.

At this time, the VPPDDR voltage of 2.5V has come out, but there is still no memory power supply. Because the memory power supply of this motherboard is generated by the conversion circuit of the PG of the PU502, we can shield it.

ASUS H110M-F 1.01 VPPDDR does not light up for refitting and repair Figure 5.

After checking the drawing, Xinzhizao knew that it was connected to PQ508, which was a small MOS tube short circuited to DS level, so it was installed and powered on.