Mechanical revolution deep-sea ghost Z3 screen flash screen does not display repair

The mechanical revolution deep-sea ghost Z3 screen did not flash, and the rear power supply did not output, so the fault of the flyer voltage tube was removed.

Machine model: deep-sea ghost Z3 of mechanical revolution

Fault phenomenon: the screen does not flash

Maintenance process: the customer said that the screen would flash when playing the game, and then it would not be displayed. There is 4.6A when connected to the ammeter, and the battery is in the normal charging state. Then it should be started, forced to shut down, and the external display is normal when restarted. The screen has no reaction at all, and the dark screen is not visible.

Mechanical revolution deep-sea ghost Z3 screen flash screen does not display repair Figure 1.

The two groups of power supply, 3.3V and 19V, of the test screen were easy to find. It was found that the 3.3V protective tube PS8 was normal, that is, the upper level conversion might not come out. The 5V of the test pin 8 tube should be normal when the power supply was turned on, but the lower level power supply did not output. It was estimated that the conversion voltage tube was broken, if there was any, think about flying the power. There was one next to it. The fault of the direct flying wire was removed, and it could be turned on normally without being on the screen.