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2. Trouble diagnosis:
1) The screen is not bright:
a. Check to see if the power supply plug from the power filter board to the power supply board is
well inserted into the socket. If not, plug it in.
b. Check if the fuse on the power supply board is blown up. If yes, replace it for a good one.
c. Remove digital processing board and analog board, ground socket X601 of the power supply
board to the AUTO mode.
Switch the power on and check if the output voltages of the power board are normal. If
normal, then the problem lies in digital processing board and analog board, which will be
dealt with separately. If abnormal, then first replace the power supply board to see if the
problem is solved.
2) There appears on the screen a line or several unlit lines.
Check if the socket between Y driving board and Y BUFFER is plugged well. If not, plug it well. If
yes then replace Y BUFFER (upper, lower) in respect to the upper , lower part of the dark line on
the screen.
3) There appear on the screen one or several horizontal lines that are much brighter than the
remaining horizontal lines at the edge:
Check if the socket between Y driving board and Y BUFFER is plugged well. If not, plug it well. If
yes then replace Y BUFFER (upper, lower) in respect to the upper , lower part of the dark line on
the screen.
4) There appear on the screen one vertical unlit line or a vertical entirely unlit block
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