Mitsubishi Electric LT-37131, Service Manual

Page: 17 / 46

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