OPPO Reno6 enters the water without 4G signal repair

After disassembling the machine, no corrosion trace was found in the signal part on the front of the motherboard. The main power supply was above and the 1.8V was below. The capacitor was seriously corroded, so the brush fell off and the resistance of the foot was disconnected, and the flying wire was borrowed for electricity.

Machine model: OPPO Reno6

Fault phenomenon: there is no 4G signal after the mobile phone is flooded, but there is 2G signal.

Fault analysis: For the machine with water inflow, first find the corrosion place, mainly the power amplifier and its power supply.

Maintenance process:

After disassembly, no corrosion trace was found in the signal part on the front of the motherboard.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 1

But there are two corrosion marks on the back of the motherboard.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 2

The power amplifier foot on the left is corroded by power supply.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 3

The top is the main power supply, and the bottom is 1.8V The capacitor is seriously corroded, so the brush falls off and the resistance of the foot is broken, so the flying wire can borrow electricity.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 4

The power-on test shows that the mobile phone has no 4G signal but 2G signal.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 5

Let’s look at another corrosion place, that is, the power amplifier.

OPPO Reno6 Water Intake Without 4G Signal Maintenance Figure 6

The top is the main power supply, and the bottom is 1.8V, which is also corroded, and the resistance value is OL, so the flying wire can borrow electricity.