Service Modes, Error Codes, and Fault Finding
5.
Table 5-1 NVM editor overview
5.6.4
Load Default NVM Values
It is possible to download default values automatically into the
NVM in case a blank NVM is placed or when the NVM first 20
address contents are “FF”. After the default values are
downloaded, it is possible to start-up and to start aligning the
TV set. To initiate a forced default download the following
action has to be performed:
1.
Switch “off” the TV set with the mains cord disconnected
from the wall outlet (it does not matter if this is from “Stand-
by” or “Off” situation).
2.
Short-circuit the SDM jumpers on the SSB (keep short
circuited).
3.
Press “P+” or “CH+” on the local keyboard (and keep it
pressed).
4.
Reconnect the mains supply to the wall outlet.
5.
Release the “P+” or “CH+” when the set is started up and
has entered SDM.
When the downloading has completed successfully, the set
should be into Stand-by, i.e. red LED on.
Alternative method:
It is also possible to upload the default values to the NVM with
ComPair in case the SW is changed, the NVM is replaced with
a new (empty) one, or when the NVM content is corrupted.
After replacing an EEPROM (or with a defective/no EEPROM),
default settings should be used to enable the set to start-up and
allow the Service Default Mode and Service Alignment Mode to
be accessed.
5.6.5
Display option code
Caution:
In case you have replaced the SSB, always check the
display option code in SAM, even if you have picture. With a
wrong display option code it is possible that you have picture,
but that in certain conditions you have unwanted side-effects.
5.6.6
Trouble Shooting Tuner section
When there is no picture in analog RF mode:
1.
Check whether picture is present in AV mode. If not, tuner
section is okay. Check video processing section.
2.
Check if option settings are correct. Tuner profile in OP10:
OPA7..OPA5=000 (China region), 010 (AP region).
3.
Check if 5 V supply is available at test points F256, F228,
F229 and F219, and if 33 V is available at test point F257.
4.
Check if the I
2
C lines are working correctly (3.3 V).
5.
Manually store a known channel and check if there is IF
output at tuner pin 11. If not, tuner is faulty.
6.
Feed in 105 dBuV at tuner pin 11 and check whether there
is CVBS output from IF demodulator IC. If not, IF
demodulator might be faulty. Check components in this
area.
5.6.7
Trouble Shooting Sound section
Figure 5-8 Fault finding tree sound section
Hex
Dec
Description
Address
0x000A
10
Existing value
Value
0x0000
0
New value
Store
Store?
1
8
490_209_090409.ep
s
090409
