Mitsubishi Electric LT-37131 Service Manual page 17

MODELS: LT-37131 / LT-37132 / LT-46131 / LT-46231
SYMPTOM POSSIBLE CAUSES
Channel or Channels missing Incorrect setup or TVGuide has not added station(s) yet 1) Verify TVGuide setup is correct. Source/Zip code/etc
from Guide
Incorrect Channel Lineup Incorrect setup or lineup was changed by service
provider
Pressing GUIDE button shows More time is needed to D/L data
"There is no data for this screen" signal from station has been lost
or "No Listings" in the program data D/L is interuppted
area loss of power
channel lineup was changed by service provider
hardware failure
Only Continue if ALL below
conditions have been met:
"No data for this
TV Power has been recycled
screen" or "No
48 hours since last setup/AC cycle
Listings" in the
TV has enough OFF time
program sections
Power to TV is not fluctuating
Customer does not turn TV on
during D/L times
Issue is
YES
resolved?
OK
NO
Check "System
Statistics" Page in
TVGOS DIAG
Mode
NO
Is HOST Chann or
VBI Chann listed in
the 90's?
YES
Verify that channel
has same program
as expected host
channel.
NO It is the same
station?
Refer to TVGuide
YES
instruction booklet
Use channel editor
to change the tune
number for the
host channel to
this channel #
Problem is caused by source
data. Customer should inform
Cable/Broadcaster or MDEA
Consumer Relations
(TVGOS Cont)
Is setup/zip code/lineup
NG
NO
Do an Initialize
TypeC is below
and wait 48 hours
10,000
YES
All data on
NO
page is all
ZEROs?
YES
Using
CableCARD?
YES
From this point
on you MUST
NO
have a valid
TVGOS data
Do VBI Slicing
source
Test (see
previous page)
PASS
Do an Initialize
and wait 48 hours
Problem is
Resolved?
NO
Problem is caused by source
data. Customer should inform
Cable/Broadcaster or MDEA
Consumer Relations
Page 17
POSSIBLE SOLUTION(s)
2) If still missing after 48 hours customer should contact MDEA
1) Verify TVGuide setup is correct. Source/Zip code/etc
2) If still missing after 48 hours customer should contact MDEA
See flow chart below
YES
Enter TVGOS
selection/source DIAG mode (see
connection OK? previous page)
Setup a splitter to
ANT2, do TVGOS
system reset,
setup TVGOS and
wait 48 hours
NO
Have you tried
splitter bypass to
ANT2?
YES
Remove
CableCARD
FAIL
Replace Signal
PWB
NG
Check G+Vid Check input to
on IC2K01 Pic Micro
OK
YES
Check continuity
between Pic Micro
and Quad UART
OK
Replace Signal or DM
PWB or TS-TS Cable
Press UP 2x to
enter "Section
Reception Slicing"
OK
CErrs and
CBad are 10%
of TypeC?
10% or
More
Source signal
quality is poor
Known issue with
CableCARD is that
service providers convert
the analog host channel
to a digital channel. The
bypass is to split the
incoming cable and
memorize the channels
on ANT2. ANT2 must be
memorized as AIR. Then
setup both ANT1 and
ANT2 with TVGOS ON.
NG
OK