Symptom/Cause Troubleshooting - Mitsubishi WD-52627 Training Manual

Symptom/Cause Troubleshooting

Use the following symptom/cause charts to determine
the most likely cause of a failure.
The areas covered are:
• PWB Symptom/Cause
• Optical Engine
Symptom
Video Problems, all Inputs & Menu
bad. Audio OK
Analog Tuning problems. External
Inputs & Digital OK
Analog Tuning & External Inputs
Problems. Digital OK
Digital Tuning problems. Analog OK
Analog & Digital Tuning Problems.
External Inputs OK
External Input Problems. Tuning OK PWB-TERMINAL
No Sync
Video Problems. Digital noise, lines
or artifacts in picture
Card Reader Problems
1394 Problems
Audio Problems. Speakers Bad.
Analog & Digital Out good
Audio Problems. Speakers, Monitor
A/V 1, Audio 2, Digital Out Bad
Audio Problems. Digital Good.
Analog Bad
Power LED blinking constantly. Won't
power on.
CableCARD problems
NetCommand problems
Control problems
Control problems (Front Panel)
Control problems (Remote)
Note: V28L models do not include the features below. Naturally, these models will not experience failures
associated with these features.
• TV Guide On Screen®
• CableCARD™ (Some Versions)
• Firewire® (IEEE1394)
• NetCommand®
• Sub-Tuner & RF Relay (Only 1 NTSC/ATSC/QAM Tuner and RF Input)
PWB Symptom/Cause Troubleshooting
Reseat DVI Cable between
Engine and Chassis
PWB-DM
PWB-MICRO
PWB-DM
PWB-DM
PWB-FMT
PWB-FMT
Memory Card Reader
PWB-DM
PWB-MICRO
PWB-DM
PWB-TERMINAL
PWB-DM
PWB-DM
PWB-DM
PWB-DM
PWB-CONTROL
PWB-PREAMP
• Power Supply PWB
• Micro & Terminal PWB
First use the PWB Symptom Cause chart to narrow
down the problem to a PWB. Then check the connec-
tions to the PWB specified. The additional charts can
help repair the set without ordering a PWB.
Most Likely
4-4
Other Possibility
PWB-MICRO
PWB-TERMINAL
PWB-MICRO
Optical Engine
PWB-DM
PWB-INTERFACE
PWB-INTERFACE