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d)
Check whether the keys have a scan signal.
3. LED Display Error
1)
Check whether the connection line and socket between the small board where the LED is and the main
board are normal.
2)
Check whether the power supply and grounding of the small board where the LED is located are
normal.
3)
Check whether the LED circuit is welded normally and whether the device is damaged by false welding.
4)
Check the LED for scanning signal.
4. OLED Display Error
1)
Check whether the connection line and socket between the OLED panel and the motherboard are
normal.
2)
Check whether the power supply and grounding of the OLED panel is normal.
3)
Check whether the OLED backlight booster circuit works normally and whether the output voltage of
12V is normal.
4)
Try replacing an OLED.
5)
If all the above are normal, A1 chip may be damaged or SPI FLASH problem. Try it after replacement.
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