Repair of Shenzhou z7-kp7gz notebook splash screen

Shenzhou Z7-KP7GZ notebook boot display flash screen; Motherboard problem opens drawing positioning to screen display interface signal normal seems 0V And this one is 5V, so after the Q27 in Figure 1 is removed, the power-on test is perfect, and the troubleshooting and maintenance of the bright machine are over

[machine model] Shenzhou z7-kp7gz notebook

[mainboard version] gk5cn6x Rev: 1.1

[fault phenomenon] notebook splash screen

[maintenance process]

Received Shenzhou z7-kp7gz notebook, boot display start on splash screen, the kind of crazy flash.No matter moving the screen, there is no change.I started to wonder if it was a screen problem.The machine was disassembled and replaced with a high-resolution screen. It didn’t flash, but the brightness couldn’t be adjusted. I thought whether the original screen would be needed. The original screen was still splash screen.So the direction of the transfer, the measurement screen line, are all connected.That can only be a problem with the motherboard. Open the drawing and locate the screen display interface.As shown in the figure:

Maintenance drawing 1 of Shenzhou z7-kp7gz notebook splash screen

Measure the relevant VCC above to get the following data:

Maintenance drawing 2 of Shenzhou z7-kp7gz notebook splash screen
There are some signals that I can’t understand, such as this a_Cover LED_BL。So I went to the forum to search.Hey, we got a link ，The signal is normal, it seems to be 0V.But this one is 5V, so according to his practice, we removed q27 from Figure 1.