As follows:Plug in the LCD power, the indicator does not light, the screen has no movement.I took a look at it myself and found that when the circuit board was not connected to the LCD panel, the indicator lamp was completely working, and the LCD was not lighted.In addition, heard the faint "chirp" sound when the lamp is bright, there is a cycle of the size of the sound, listens carefully, is a panel on a yellow tape wrapped coil, looked at the Internet looks like a transformer, is it right?Also, this machine appeared in the morning, the light is not bright, the screen is not bright, but I have repeatedly energized several times, and suddenly started normal, after starting all normal. But it never started again in the afternoon.Questions are hereby given as follows:Is it possible to analyze the entire circuit board without any major problems? Is the problem on the transformer? Is it possible to change a transformer? I am a rookie, this time I want to try ~ thank you ~!
The panel is a step-up transformer booster. It is necessary to change the booster board.This is automatic protection.
The screen brightness is not enough, and then black, boot, "squeak" sound pressure plate that is mainly the high voltage transformer (i.e., the "yellow tape wrapped coil) winding interturn short circuit of the transformer can be replaced.
It is the high frequency transformer, the transformer core buzz may be loose, to reinforce ab. Probably the majority, poor contact caused by sealing off no problem, does not change the transformer, available iron welding a circuit board, especially solder cracks or heat (color) components, see. No, consider transformer again.
