Acer H236HL - Display and Color Quality Problems

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3. DIM
OK
The end
OK
The end
OK
The end
DIM (image overlap, focus or flicker)
Reset in factory mode
Set to the optimal
frequency, select the
recommended frequency
Pull out signal cable and
check “Self Test Feature
Check” is ok?
Check the signal cable
and the PC
Readjust the phase and pixel
clock in the user mode
Replace the main board
Replace the panel
NG
NG
NG
OK
NG
NG
OK
The end
OK
NG