8 Ver1.0
(2). Power can be turned on but it goes off when replaying picture or video file:
A. Check if the circuit around U4 DDR RAM is normal, if normal then replace
the main board.
B. If U4 is normal but the power goes off while replaying picture or video file,
replace U3, if U4 is damaged, replace the main board.
Symptom Repairing
(1). LCD unable to normally display:
A. Check if J2.1 has 3.3V first.
B. If 3.3V voltage is normal, check if 3.3V on the LCD board is normal. If LCD
board 3.3V is normal, then check if the backlight is normal. If the backlight
circuit does not have 10V output voltage, replace the LCD board.
C. Use oscilloscope to measure if J2
Pin22(LCD_SCL),Pin23(LCD_SDA),Pin24(LCD_CS) and PIN9 (LCDCLK)
have signal output, if abnormal then remove LCD Cable and test one more
time. If still not normal, replace the main board.
D. If the signals on LCD_CS, LCD_SCL, LCD_SDA and LCDCLK of LCD are
normal, check if the components around LCD Panel are normal, if normal
then replace LCD Panel. If still invalid after replacement, replace the LCD
board.
Abnormal LCD
display
(2). LCD shows white display:
LCD shows white display due to bad LCD cable contact.
A. Check if J2 Pin22 (LCD_SCL),Pin23(LCD_SDA) and Pin24(LCD_CS) have
signal output.
B. If the signals from LCD_CS, LCD_SCL and LCD_SDA are normal, then
reinstall LCD cable.
C. If still not normal, replace LCD cable. If the problem remains, replace the
LCD board.
(1). The power-on picture is shown after the power is turned on, but the image
cannot be seen:
The power-on picture is shown after the power is turned on, but the image
cannot be seen, please check sensor board circuit.
A. Check if the connection between sensor board and main board is solid.
B. Use the meter to check if sensor board J1.1 has 3.3V and if J1.3 has 1.8V.
C. Check if sensor board C1.1 has 3.3V voltage, if the voltage is not normal,
then check the sensor board.
D. If the voltage is normal, then use oscilloscope to check if sensor board
J1.16, J1.13, J1.35 and J1.36 have signal output, if not normal, replace the
main board.
E. If the above is normal then replace the sensor board.
Abnormal image
(2). There are thick horizontal lines in the image:
A. Use USB to turn the power on first and view the image on PC.
B. If the lines are still existing on the PC image then check if the sensor board
L1 and C1 are normal. If normal, then replace the sensor board.
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