Video Troubleshooting - Mitsubishi Electric LT-3280 Service Manual

2. No picture displayed and picture errors. 2. No picture displayed and picture errors. 2. No picture displayed and picture errors. 2. No picture displayed and picture errors. 2. No picture displayed and picture errors.
Note ) It applies when there is no screen display or an unusual screen is outputted, although
24V(Voltage between pin4(GND) and pin6(24V) of Connecter-PC) from PWB-POWER
is outputted normally and the back light is turned on.
*Input source changes in following order with DEVICE UP button of remote control or DEVICE
button of front switch.
2-1. No picture displayed and picture errors of all input. 2-1. No picture displayed and picture errors of all input.
2-1. No picture displayed and picture errors of all input. 2-1. No picture displayed and picture errors of all input. 2-1. No picture displayed and picture errors of all input.
Is all harness connected correctly?
(especially between PWB-MAIN
and LCD PANEL (CNF1))
Are the specified voltages available at the
connectors below?
S5V
S3.3V
4.5V
Psave1*
Psave2*
Psave3*
* control signal of S3.3V
Problem is in IC300 or IC400 or their
peripheral circuits.
Please exchange PWB-MAIN
*When it cannot still fix, it may have a problem with LCD-Module. *When it cannot still fix, it may have a problem with LCD-Module. *When it cannot still fix, it may have a problem with LCD-Module. *When it cannot still fix, it may have a problem with LCD-Module. *When it cannot still fix, it may have a problem with LCD-Module.
MODELS: LT-3280D/LT-3780D
PC
NO
YES
CN Pin No. Voltag
Name e
PD 9 5Vdc
PD 10,11 3.3Vdc
PD 12 4.5Vdc
PE 2 3.3Vdc
PE 3 3.3Vdc
PE 4 3.3Vdc
YES
Page 38
Monitor Link
Poor harness connection or
defective cable.
NO
Problem is in the following
circuit (and peripheral
circuits) .
Voltage with
problem
S5V
S3.3V
4.5V
Psave1
Psave2
Psave3
PWB
including
the circuit
in problem
POWER
POWER
POWER
MAIN
MAIN
MAIN