Prima PH50D8, Руководство по обслуживанию

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Switch the power on and see if the screen is lit. If the screen can give a normal and
completely white field signal, then the problem lies in our main board or video frequency
processing board, which will be dealt with separately.
d. If the screen is not lit, then first replace the power supply board to see if the problem is
solved.
e. If the problem remains after the power supply board is replaced, then the problem lies in the
screen. Replace the entire screen for treatment.
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
SW2001