Mechanical Revolution deep-sea ghost Z3 flash screen repair

The mechanical revolution deep-sea ghost Z3 flash screen is directly connected to the fly power line. The machine no longer flashes, and the maintenance is over.

Machine model: deep-sea ghost Z3 of mechanical revolution

Fault phenomenon: flashing screen

Maintenance process: the customer said that when he played the game, the screen would flash, and then it would not show. When he connected the ammeter and started up, the battery was 4.6A, and the battery was in normal charging state, so he should start up.

Forced shutdown, restart and the external display is normal. The screen does not respond at all, and the dark screen cannot be seen. The two groups of power supply, 3.3V and 19V, of the screen were disassembled and tested. It was easy to find these two groups of power supply. It was found that the protective tube PS8 in 3.3 was normal, which means that the superior conversion might not come out.

In the test, the 8-pin tube has 5V, which means that the power supply is normal when it is turned on, but the power supply of the later stage is not output. It is estimated that the switching voltage of the tube is broken, and there is no ready-made one. Think about it. There is a direct connection line next to it. The screen will no longer flash. This is the end of the maintenance.