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MDC-2900 Series
Chapter 4 Troubleshooting and on-board repair
0092629012-07
4-17
4.3.2.10 Synchronization of screen abnormality
4.3.2.11 High voltage abnormality
Logic PCB failure
LCD unit failure
Can the following signals be observed at the connectors J1-7
and J1-8 at the rear of the Display unit?
656
μ
s
15.63
μ
s
1.04
μ
s
[J1-7]
[J1-8]
16.66 ms
5 V
5 V
Is LVDS signal output at
connector of J704?
Logic PCB failure
Synchronization of display is unstable or not
synchronized.
Yes
No
No
Yes
0 V
0 V
Modulation PCB failure
Is the fuse for Modulator high voltage
in display unit melted down?
Power supply PCB of
display unit or faulty
connection of antenna
connection cable is faulty.
No
Yes
When P2 antenna connecting cable is
disconnected, is the resistance
between J2-1 of modulation PCB and
earth 100 k
Ω
or less?
P2-1 (250 V) of antenna
connection cable may be
short-circuited with the
shield or the housing.
Yes
No
Is the HIGH VOLTAGE in MENU >
SYSTEM > BITE > ANT MONITOR
10 V or less?
Go to [4.3.2.12 Pulse
length control failure] in
page 4-18
or Power supply PCB of
display unit failure
No
Yes