HL720S/D Service Manual
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Color error include OSD menu
Check the panel harness.
Check scaler output signal.
Color error except OSD ment.
Check the signal cable.
Check pins of the signal cable.
Check input/output signal of the signal cable
Key button error
Check the function(key) harness.
Check the function ass’y (mechanical).
Brightness differ between upper and
lower on screen.
Because of viewing angle.
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