Repair of z7m-ct7gs laptop screen not on

The z7m-ct7gs laptop of Shenzhou Zhanshen is not on, and the LCD VCC is 0.6 abnormal.Find the place where VCC was produced. After careful observation, it was found that the appearance of a 40.2k voltage divider resistor R524 was abnormal. It was directly broken with tweezers and replaced decisively.

Machine model: Shenzhou Zhanshen z7m-ct7gs

Machine plate No.: gk5cp5z

Fault phenomenon: the screen does not light up

He said to the customer that the screen was broken.After the peer changes the screen, it still doesn’t light up.Just give it to us.

Shenzhou Zhanshen z7m-ct7gs notebook screen maintenance Figure 1

No obvious Short circuit was found when Measuring diode value was disassembled. When switch was powered on, the current was 1.7-1.8a or so.

Shenzhou Zhanshen z7m-ct7gs notebook screen maintenance Figure 2

Connect keyboard case light can switch.It indicates that the external device has been in self-test. Check the interface condition of screen directly. The screen VCC is normal, 3.3V_LCD VCC is 0.6 abnormal.

Shenzhou Zhanshen z7m-ct7gs notebook does not light screen maintenance Figure 3

Then go down and find the place where VCC is produced. After careful observation, it is found that a 40.2k voltage divider resistor R524 is abnormal in appearance, which is directly broken with tweezers and replaced decisively.

Shenzhou Zhanshen z7m-ct7gs notebook does not light screen maintenance Figure 4