Service Modes, Error Codes, and Fault Finding
EN 19
LC4.41A AA
5.
5.7.2
Load Default NVM Values
In case a blank NVM is placed or when the NVM content is
corrupted, default values can be downloaded into the NVM.
(For empty NVM replacement, short the SDM with a jumper
and apply the mains voltage. Remember to remove the jumper
after the reload is completed). After the default values are
downloaded, it will be possible to start up and to start aligning
the TV set. This is no longer initiated automatically; to initiate
the download the following action has to be performed:
1.
Switch “off” the TV set by disconnecting the AC Power
plug.
2.
Short circuit an SDM jumper (keep short-circuited).
3.
Press P+ or Ch+ on the local keyboard (and keep it
pressed).
4.
Switch on the TV set via the AC Power plug.
5.
Keep pressing the P+/Ch+ button until the set has started
up and the SDM is shown.
Alternative method:
1.
Go to SAM.
2.
Select NVM Editor (not SC NVM Editor).
3.
Select ADR (address) to 1 (dec).
4.
Change the VAL (value) to 170 (dec).
5.
Store the value.
6.
Disconnect the mains plug and wait for a few seconds.
7.
Reconnect the mains plug and wait until the set goes into
its standby mode (red LED lights up).
8.
Restart the set.
5.7.3
Flash New Scaler Software
When you need to flash new scaler software, follow the
instructions in ComPair. Make sure you put the set in one of the
Service Modes, SDM/SAM/CSM, before you start flashing.
This reduces the risk of the set hanging during the flashing
procedure.
5.7.4
Tuner and IF
No Picture in RF Mode, but there is a Noise Raster
1.
Check whether picture is present in AV. If not, go to Video
processing troubleshooting section.
2.
If present, check if the Option settings are correct.
3.
Check if all the supply voltages are present (3.3/5/8/12/33
V).
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.
6.
Check the tuning DC voltage at pin 2 of the Tuner. The DC
voltage should vary according to the frequency/channel
being chosen.
7.
If the tuning voltage is OK, check the tuner output, pin 11.
8.
If it has no output, the Tuner may have a defect. Change
the Tuner.
Sound in Picture Problem for L' System (rolling horizontal
lines) - for EU sets only
1.
Check whether AGC L' in SAM mode is set to 0.
2.
If yes, align the set to correct value.
Required System is not Selected Correctly
Check whether a Service jumper (#4204 & 4205, 0805 size) is
present. If yes, remove it.
5.7.5
Video Processing
No Power
1.
Check +12 V and 3V3 at position 1J02.
2.
If no supply, first check the connector 1J02.
3.
If the connector is correct, check the power supply board.
Power Supply is Correct, but no Green LED
1.
Check if the connectors 1K00 are properly inserted.
2.
If they are inserted correctly, check if the 3V3 is present.
No Picture Display (blank screen with correct sound
output)
1.
Check whether the user menu is visible.
2.
If the user menu is OK, activate teletext mode.
3.
If teletext is OK, the problem is in the ADC (B18) &
Columbus 3D combfilter (B19), if present (depending on
model, see also paragraph “Teletext Path” in chapter 9).
4.
If the user menu is not visible, check if the LCD panel
backlight is ON.
5.
If the backlight is OFF, the problem is in the power supply
board or LCD panel. Also check pin 12 (LAMP_ON_OFF)
of 1J02. It should be HIGH during normal operation.
Note:
For fault finding purposes, it is important to know the
following: in Pixel Plus and Digital Crystal Clear models, which
have an ADC (B18) and Columbus 3D combfilter (B19), the
digital input of the scaler is used for the digital video path
(Hercules output), whereas the analogue RGB input (analogue
input of the scaler) is only used for teletext. This means that no
mixed mode (video plus teletext simultaneously) is possible. If
there is sound and teletext, but no video and user menu (blank
screen), the digital path (Hercules - ADC - Columbus - Scaler)
is faulty. If there is sound but no teletext, the back-end part
(Scaler - LCD panel) is faulty.
No TV, but PC is Present
1.
Check if Hsync_SDTV and Vsync_SDTV are present at pin
1 & pin13 of 7E03.
2.
If they are present, check teletext output.
3.
If there is no teletext output, the IC TDA150xx may be
defect.
5.7.6
Power Supply
There are two types of Power Supply Units used in the various
models of this chassis. Both Supply Units come with the PDP
Panel and are a “Black Box” for Service. The 42” models are
equipped with the SDI S42SD-YD09 v5 PDP Panel with Supply
Unit. The 50” models are equipped with the SDI S50HW-YD01
w1 PDP Panel with Supply Unit. For fault finding issues, refer
to the SDI PDP Repair Manual (order code 3122 785 16380).
