Prestigio PMP3084B Product Service Manual page 14

Prestigio PMP3084B/BRU
7. LCD Display screen
Abnormal cases：
7.1. Display turns black completely after start-up.
7.2. Display turns white or black and white completely after start-up.
7.3. Display flashes after start-up.
Resolutions：
7.1. Display turns black completely after start-up.
1. Insert a USB device or connect the power adaptor, press Reset button to check whether the device can start up
normally.
2. Check the FPC connection between the LCD and the mother board.
3. Check the backlight voltage LED+ of the LCD works normally.
4. Check the resistor array of the LCD circuit of the mother board.
5. Replace a new LCD for comparison to get rid of LCD problem.
6. Update the system.
7.2. Display turns white or black and white completely after start-up.
1. Check the FPC connection between the LCD and the mother board.
2. Check the pin jack of the mother board to find out there is or not something foreign that leads to poor
connection.
3. Check the voltage of LCD-VCC（3.3V）,VGL,VGH,VCOM and AVDD.
4. Check the resistor array of the LCD circuit of the mother board.
5. Replace a new LCD for comparison to get rid of LCD problem.
6. Update the system.
7.3. Display flashes after start-up.
1. Check the power capacity of the battery.
2. Check the FPC connection between the LCD and the mother board.
3. Check the voltage of LCD-VCC（3.3V）,VGL,VGH,VCOM and AVDD.；
4. Check the resistor array of the LCD circuit of the mother board.
5. Replace a new LCD for comparison to get rid of LCD problem.
6. Update the system.
As for the problems, refer to the following circuit diagram or location diagrams for detail.
14