EMB-6011 mainboard startup does not respond to repair

Motherboard version number: EMB-6011 motherboard (H81 chipset)

Malfunction: The motherboard does not respond when it is turned on.

Maintenance process:

EMB-6011 mainboard doesn’t respond after startup repair Figure 1.

An EMB-6011 motherboard, all V switch and diode value are normal, plug in the power supply,no power on, (Inductor will be automatically removed when COMS battery is unplugged), and there is no response at Switch, check the standby conditions.

Search VCCDSW3_3 in the circuit, find Capacitor C417, and the quantity of VCC 3.35V is normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 2.

Search VCCSUS3_3 again and find Capacitor C435. The quantity of VCC 3.3V is normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 3.

VCC is ok, check four conditions of RTC circuit, search RTCRST#, find resistor R142, and test VCC 3.1V to be normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 4.

Search SRTCRST# again, find resistor R146, and test VCC with 3.1V normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 5.

The 32.768KHZ wave pattern is also normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 6.

Look for the DPWROK signal again. One end of resistor R134 is DPWROK and the other end is RSMRST#, and both ends of VCC are 3.3V, which is also normal.

EMB-6011 mainboard doesn’t respond after startup repair Figure 7.

Then look for PWRBTN signal,switch Switch,IO also has high and low signals sent to the bridge.

EMB-6011 mainboard doesn’t respond after startup repair Figure 8.

The standby conditions of INTEL H81 chipset have basically been checked, and switch Switch, SLP_S5, SLP_S4 and SLP_S3 are all inactive. After the bridge is changed, it is still no power on.

Carefully measure the ground diode value of each signal. When the RTCRST# signal is measured, C101 Capacitor is found, and a piece is missing.