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9-2
DM Module Check
When the TV turns On, but a problem exists that may
be caused by the DM Module, perform the following
two checks:
1) Select the DTV Antenna as the source an
select and HD Channel.
2) Select an analog 480i signal as the source
and note if an On Screen Display (OSD) is
present.
The ability to display Menus and receive an HD channel
indicates the DM Assembly is functioning properly.
Except for the convergence crosshatch, all OSD signals
are generated in the DM Module. When there is no
OSD using a 480i source, the DM assembly may be the
cause of the problem. However, before condemning
the DM, make certain it is properly seated onto the
PCB-DTV TUNER and that all connections between
the PCB-DTV TUNER and PCB-SIGNAL are secure.
NetCommand
TM
Control Problems
If devices in a Home Theater System cannot be con-
trolled properly with NetCommand, the Remote Con-
trol may not be in the NetCommand Operational Mode.
To put the Remote in the NetCommand Mode:
1) Set the Remote to the TV Layer.
2) Point the Remote away from the TV.
3) Press and Hold the "POWER" button and
enter "9-3-5" in sequence.
CRT Phosphor Protection
Troubleshooting problems in the CRT Protect, De-
flection Loss Detection and the Deflection circuits,
sometimes involves disabling the CRT Protect cir-
cuitry and then Powering up the TV.
However, first disable the CRTs to prevent any
possible phosphor damage.
1) Unplug the SP connector at the PCB-
CRT(R). This removes the filament voltage
to all three CRTs.
2) Remove zener diode D5A13 on PCB-MAIN.
This disables the CRT Protect circuit.
The set then can be switched on for troubleshooting
without damaging CRT phosphors.
Error Code Probable Cause
12 No error detected
21 X-Ray Protect
22 Short Protect
23 Loss of Deflection
Table 9-2: Error Codes