2. No display after turning on:
Y Y Y
N N Y
Y
N
N Y
N
Y Y
N N
No display
after turn on.
Check if the CPU
is fixed correctly.
Take off the CPU,
clean it and fix
well again.
Replace the display
board.
Check the main
board.
Check if the
voltage value
between the pins of
oscillator CR1 is
0.20v.
Change the
oscillator.
Replace the CPU.
The main board is
damaged. Please
replace it.
Displays well when
power on.
The display is
faulty.
Replace the 16
cores wire.
The display can
work normally.
The 16 cores wire
is damaged.
The pins of LCD
are welded bad.
Reweld the pins.
The driver of
display board is
welded bad.
Reweld it.
Change the
LCD.The problem
can be solved.
The LCD is
damaged.
