Dell G7 does not boot (damaged bridge)

When measuring the main board inductance with single board, it is found that the bridge's resistance of 1.05V is 0, which indicates that there may be something wrong with the bridge. Other inductance resistances are normal when measured. If the bridge is burnt with 1V, the bridge will be locked for short circuit damage. The specific maintenance process is as follows:

Dell G7 does not boot (damaged bridge)

When measuring the main board inductance with single board, it is found that the bridge’s resistance of 1.05V is 0, which indicates that there may be something wrong with the bridge. Other inductance resistances are normal when measured. If the bridge is burnt with 1V, the bridge will be locked for short circuit damage. The specific maintenance process is as follows:

“Machine model” Dell G7

[Fault phenomenon] No boot.

[Maintenance process] The board number is LA-E994P, which is a single board sent by a colleague for maintenance. The model is Dell G7, and the fault is that it won’t start.

Dell G7 does not boot Figure 1

Dell G7 does not boot Figure 2

I ordered a good bridge to be replaced, and then I measured the resistance of the bridge and turned it on after it returned to normal. When I pressed the power-on key, I found that the current was set at 20mA. After testing, I found that the BIOS had no waveform. When I changed the bridge to normal, I needed to change the me. When I removed the BIOS, I found that a name of the BIOS was broken. Maybe the previous bridge was short-circuited, which burned the BIOS. I switched to a new BIOS, brushed it with the original factory program, and then I was able to turn it on normally.