Meijie SY-H91+all solid state v2.0 startup triggered power down repair

Meijie SY-H91+all solid state version v2.0 starts and triggers a power failure. The qs17 is eliminated and the fault is repaired.

Machine model: Meijie SY-H91+all solid state version v2.0

Fault phenomenon: power failure triggered by startup

Maintenance process: All power supplies are normal when the CPU is removed, and the PU31 is normally lit once when the CPU is removed. The original fault is found later. Of course, the BIOS has also tried, and has never doubted its problem. It also has a try mentality to carry out the next step of work, and the check conditions are basically normal.

When the up1651q 13sclk 15 pin sdat signal is found to be abnormal, the voltage is 0V, which must be abnormal. After tracing the signal, it usually communicates with the bridge. There is nothing around the bridge, so it is just a qs17. The upper end of the measurement is 0. Without saying anything, kill it and take a chance. The 13sclk 15 pin SDAT signal comes out again. After installing the CPU, the power is not lost, and the machine is turned on perfectly.