Service Modes, Error Codes, and Fault Finding
5.
5.8.3
Protections
Activating SDM via the “service pads” will overrule the
processor-controlled protections, but not the hardware
protections. This means, that the A/D-input protections (5 and
8 V) and the I2C “not-acknowledging” info of FBX + EPLD + 3D
Comb and of the tuner are overruled.
Caution
: When doing this, the service technician must know
what he is doing, as it could lead to damaging the set.
5.8.4
Power Supply
The simplest way to repair the power supply is to check (and
replace if necessary) the components that are marked gray on
schematic SP1.
5.8.5
AUX Supply
First determine whether one or more of the secondary diodes
(6044, 6021, 6291, 6293) are short-circuited. If this is not the
case, check (and replace if necessary) the components that
are marked gray on schematic SA.
Table 5-2 Repair tips
5.9
Software Downloading
In this chassis, you can
upgrade
the software via ComPair
without removing the back cover of the set. The switch, which
is needed for the software downloading procedure, can be
reached through the cooling gaps of the back cover. The switch
is located next to the SAM/SDM pads and can be operated with
a long and thin screwdriver. Make sure that you do not damage
the PWB with sharp objects. You can find more information on
how this procedure works in the ComPair file. It is possible that
not all sets are equipped with the hardware, needed to make
software upgrading possible. To speed up the programming
process the firmware of the ComPair interface can be
upgraded. See paragraph “How To Order” for the order number
Phenomenon
Possible Cause
Repair tips
No picture, LED blinking at
3 Hz.
Set is in protection due to vari-
ous causes. For error codes
see error-code list.
You have no picture, so:Read the error buffer via ComPair (error buffer is ac-
cessible when set is in protection, compare-file will guide you to this)- Read the
blinking LED information via standard remote command <mute>
06250x
<ok>.-
Or you read the error code sequence via standard remote command
<mute>
062500
<ok>. When you have found the error, check the circuitry relat-
ed to the supply voltage and I2C-communication or the circuitry that triggers
the protection.
No picture, LED blinking
with code 6-6-6 or 18-18-
18.
No communication on slow I2C-
or fast I2C-bus.
As processor cannot communicate with one of the 2 busses it the standby-led
spontaneously starts blinking 6-6-6-etc or 18-18-18-etc... If in the error buffer
somewhere is an error 6 or 18, these will have the highest priority starting the
mentioned blinking. Measure dependent of the error on the I2C-bus which de-
vice is loading the bus. (Use I2C-overview)
No picture, LED blinking
with code 1-1-1.
No communication on NVM-I2C
bus to the uP.
As the uP cannot communicate with the NVM I2C bus, it spontaneously starts
blinking 1-1-1.
Note:
when there is no access to the NVM, a lot of picture setting can go
wrong.
No RC-reception. LED does
not echo RC-commands.
uP circuitry or RC-receiver is
defective.
In case the set does react on a local keyboard operation, you must check the
RC-receiver circuitry (diagram LD).
Picture is not synchronised. The sync is derived in the HIP. Check crystals in the HIP circuit on bad contacts.
Picture is distorted.
Check video-path in Service
Default Mode.
Investigate whether there is an error code present in the error buffer. In case
there is one, check the I2C-bus and/or supply lines (see overview supply
lines).Measure and check signal path Tuner-HIP-FBX-EPLD.
Picture with horizontal
stripes.
Pixel Plus processing is mal-
functioning
Check functionality on circuitry (B3a, B3b, and B3c) of PICNIC (7713), FAL-
CONIC (7718, EAGLE (7724) and/or field memories (7714, 7717, 7719, 7722
and 7723.Tip: the whole Pixel Plus chipset (3 ICs + 5 Field Memories) can be
diagnosed via ComPair.
No menu, no OSD.
Probably a defective uP.
Measure test points B61to B64 on diagram B5A.
No NextView (EPG).
IC7012 defective or not pow-
ered.
Check circuitry around IC7012 on diagram B5A.
No Teletext.
IC7007 defective or not pow-
ered.
Check circuitry around IC7007 on diagram B5A. Check also B61 to B64
around uP on diagram B5A.
Various symptoms, due to
missing local supply volt-
age.
An interrupted fuse, NFR-resis-
tor or connection.
When no symptom or error code leads you to a specific circuitry, use the sup-
ply lines overview (see supply lines overview), for a quick scan of all supply
lines.
For ITV (Institutional TV)
models, it is possible that
the service modes are not
functioning as expected.
"Hotel Mode" option is set to
"ON". This can cause problems
with service modes.
Switch "OFF" the "Hotel Mode" option, in "Service Alignment Mode", "Service
Options", "Miscellaneous", "Hotel Mode". After repair this option should be
switched on again to use Hotel Mode functionality.
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