Mitsubishi Electric LT-37131 Service Manual page 14

SYMPTOM
No channel map appears when pressing
1
guide button (TVGuide disabled)
Channel map does not change after card
2 is installed. (still showing basic cable map)
3 Host ID screen does not appear
Error code received on screen. Error
4
codes are listed such as 161-x
Individual channel cannot be received.
5 (example HBOHD is no video and no audio
but other HBO channels are OK)
Certain tier of channels is not received.
6 (example: Premium channels or all HD
channels not received)
Unable to tune to a channel. (example:
Pressing 1055 has no response and stays
7
on current channel)
When using SA card channels changing
automatically and random message about
8
upgrade in process. (Channels are often
like 10,000 to 50,000)
Periodically encrypted channels become
9
unavailable.
Only Analog channels can be viewed. All
10
digital/encrypted channels are unavailable
ChannelView does not list program content
11
or channel call letters
MODELS: LT-37131 / LT-37132 / LT-46131 / LT-46231
POSSIBLE CAUSE(S)
Cable is not connected to ANT1 -or-
OOB data is not received correctly
CableCARD is not 'Initialized' within the
service providers system.
Signal and information not received by
TV
Communication between TV and card is
lost or disrupted
The TV has no means to block individual
channels. Proper authorization is not
received.
Authorizations to display scrambled
channels are sent via OOB data.
1055 is not available in the channel map.
Channel map is sent via OOB from the
service provider.
CableCARD firmware is out of date and
being upgraded by service provider.
Card is hung
Proper authorization is not received or TV
cannot display digital video
This information is provided in the form of
OOB data tables and is sent at the
discretion of the service provider
1) Verify cable is connected to ANT1
2) Re-install/Replace CableCARD
3) Verify signal level and signal noise level
4) Contact Service Provider
5) Check TU101 for proper function/Replace Signal PWB
Contact service provider
1) Verify cable is connected to ANT1
2) Re-install CableCARD
3) Replace CableCARD
4) Verify signal level and signal noise level
1) Pull card from TV and wait 5 minutes. Then reinstall the
card and verify it is initializing properly.
2) Press INPUT & FORMAT keys on the front panel.
3) Replace CableCARD with new card
4) Try 3rd CableCARD
5) Replace DM-PWB
Contact service provider
Contact service provider
Verify OOB is locked. If OOB is locked, verify channel should
be received. If not locked, troubleshoot for OOB failure on
SIGNAL PWB and/or with service provider.
If this process continues more than 60 minutes, contact the
service provider for updated card
Unplug card or AC or perform initialize
1st test for QAM clear channel (often network channels are
provided free), if no QAM clear channel is available remove
the card and memorize channels. Verify that a digital channel
can be viewed. If known digital channel cannot be viewed
suspect SIGNAL
Contact service provider
Page 14
POSSIBLE RESOLUTIONS