Christie DS Series Service Manual page 22

Screen is abnormal.
Are start-up
YES
screen and Menu screen normal?
Does the problem occur on
a certain input
port?
NO
What is the symptom like?
Unstable screen
(including flicker)
Is the problem YES
solved after adjusting
Vcom?
NO
YES
Is the problem
solved after turning off
W/B correction?
NO
The following parts may be
failed.
Replace them in turn, and
check if the problem is solved.
Light source unit Assy
POWER UNIT CIRCUIT(Main/Sub)
LNS/PRSM Assy
Completed
LWU900-DS/LHD878-DS/LWU755-DS
Service Manual
LWU900-DS / LHD878-DS / LWU755-DS
YES
Is input signal normal?
Dark screen
YES
POWER UNIT CIRCUIT(Main/Sub)
Is the problem YES
solved after replacing
MAIN PCB or
DRIVE PCB?
NO
Replace dichroic Assy.
Replace MAIN PCB or DRIVE PCB.
W/B abnormality
B
(Continued on next page)
NO
Is the problem
YES
solved after executing
FACTORY RESET?
NO
Ambient
YES
temperature: Less than
0 or 35 40
Position Upward
projection?
NO
Is the problem YES
solved after turning off
W/B correction?
NO
The following parts may be
failed.
Replace them in turn, and
check if the problem is solved.
Light source unit Assy
POWER UNIT CIRCUIT(Main/Sub)
LNS/PRSM Assy
Dichroic Assy
Completed
21
Resolution failure
C
(Continued on next page)
Adjust ambient temperature
or projector position.
NO
YES
Is the problem solved?
Is the problem
YES
solved after replacing
MAIN PCB?
NO
Replace dichroic Assy.
020-001586-01 Rev. 1 (02-2021)
LIT MAN SERV DS Series