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LA-K061P triggered power failure (5V short circuit)
Fault model: LA-K061P
Fault phenomenon: triggering power failure
Maintenance process: I received a machine sent by a customer for repair, the model is LA-K061P, and the fault shows direct power-off protection after triggering.
The machine sent a single motherboard with the number of LA-K061P, which was triggered by ammeter and then directly protected by power on.
LA-K061P triggered power failure Figure 1
Measure the resistance of major power supply inductors, and it is found that the resistance of 5V is short-circuited, so let’s directly burn the machine to see if it can be burned out. When burning the machine, it is found that the back of the 5V inductor is hot, and it is found that a capacitor is damaged by touching it. Just buckle the capacitor directly, measure the resistance of 5V and restore it to more than 490, and then power on it to trigger the startup.
Maintenance result: the screen connection test can be successfully lit into the system. Because there is no external test function, the maintenance is over.