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•

Error 31 (Lnb controller). When there is no I

2

C 

communication towards this device, LAYER 2 error = 31 
will be logged and displayed via the blinking LED 
procedure if SDM is activated.

•

Error 34 (Tuner). When there is no I

2

C communication 

towards the tuner during start-up, LAYER 2 error = 34 will 
be logged and displayed via the blinking LED procedure 
when SDM is switched on.

•

Error 35 (main NVM). When there is no I

2

C 

communication towards the main NVM during start-up, 
LAYER 2 error = 35 will be displayed via the blinking LED 
procedure when SDM is switched “on”. All service modes 
(CSM, SAM and SDM) are accessible during this failure, 
observed in the Uart logging as follows: "<< ERRO >>> 
PFPOW_.C: First Error (id19, Layer_1= 2 Layer_= 35)".

•

Error 36 (Tuner DVB-S). When there is no I

2

C 

communication towards the DVB-S tuner during start-up, 
LAYER 2 error = 36 will be logged and displayed via the 
blinking LED procedure when SDM is switched “on”.

•

Error 42 (Temp sensor). Only applicable for TV sets 
equipped with temperature devices.

•

Error 53. This error will indicate that the PNX8550 has 
read his bootscript (when this would have failed, error 15 
would blink) but initialization was never completed because 
of hardware problems (NAND flash, ...) or software 
initialization problems. Possible cause could be that there 
is no valid software loaded (try to upgrade to the latest main 
software version). Note that it can take a few minutes 
before the TV starts blinking LAYER 1 error = 2 or in SDM, 
LAYER 2 error = 53.

•

Error 64. Only applicable for TV sets with an I

2

C controlled 

screen.

The blinking LED procedure can be split up into two situations:
•

Blinking LED procedure LAYER 1 error. In this case the 
error is automatically blinked when the TV is put in CSM. 
This will be only one digit error, namely the one that is 
referring to the defective board (see table “

5-2 Error code 

overview

”) which causes the failure of the TV. This 

approach will especially be used for home repair and call 
centres. The aim here is to have service diagnosis from a 
distance. 

•

Blinking LED procedure LAYER 2 error. Via this 
procedure, the contents of the error buffer can be made 
visible via the front LED. In this case the error contains 
2 digits (see table “

5-2 Error code overview

”) and will be 

displayed when SDM (hardware pins) is activated. This is 
especially useful for fault finding and gives more details 
regarding the failure of the defective board.

Important remark: 
For an empty error buffer, the LED should not blink at all in 
CSM or SDM. No spacer will be displayed.

When one of the blinking LED procedures is activated, the front 
LED will show (blink) the contents of the error buffer. Error 
codes greater then 10 are shown as follows:
1.

“n” long blinks (where “n” = 1 to 9) indicating decimal digit

2.

A pause of 1.5 s

3.

“n” short blinks (where “n”= 1 to 9)

4.

A pause of approximately 3 s,

5.

When all the error codes are displayed, the sequence 
finishes with a LED blink of 3 s (spacer).

6.

The sequence starts again. 

 
Example: Error 12 8 6 0 0. 
After activation of the SDM, the front LED will show: 
1.

One long blink of 750 ms (which is an indication of the 
decimal digit) followed by a pause of 1.5 s

2.

Two short blinks of 250 ms followed by a pause of 3 s

3.

Eight short blinks followed by a pause of 3 s

4.

Six short blinks followed by a pause of 3 s

5.

One long blink of 3 s to finish the sequence (spacer).

6.

The sequence starts again. 

Use one of the following methods:
•

Activate the CSM. The blinking front LED will show only 
the latest layer 1 error, this works in “normal operation” 
mode or automatically when the error/protection is 
monitored by the Stand-by processor.
In case no picture is shown and there is no LED blinking, 
read the logging to detect whether “error devices” are 
mentioned. (see section “

5.8 Fault Finding and Repair 

Tips

, 

5.8.7 Logging

”).

•

Activate the SDM. The blinking front LED will show the 
entire content of the LAYER 2 error buffer, this works in 
“normal operation” mode or when SDM (via hardware pins) 
is activated when the tv set is in protection.

Most of the protections and errors use either the stand-by 
microprocessor or the MIPS controller as detection device. 
Since in these cases, checking of observers, polling of ADCs, 
and filtering of input values are all heavily software based, 
these protections are referred to as software protections.
There are several types of software related protections, solving 
a variety of fault conditions:
•

Related to supplies: presence of the +5V, +3V3 and 1V2 
needs to be measured, no protection triggered here.

•

Protections related to breakdown of the safety check 
mechanism. E.g. since the protection detections are done 
by means of software, failing of the software will have to 
initiate a protection mode since safety cannot be 
guaranteed any more.

Remark on the Supply Errors
The detection of a supply dip or supply loss during the normal 
playing of the set does not lead to a protection, but to a cold 
reboot of the set. If the supply is still missing after the reboot, 
the TV will go to protection.

Protections during Start-up
During TV start-up, some voltages and IC observers are 
actively monitored to be able to optimise the start-up speed, 
and to assure good operation of all components. If these 
monitors do not respond in a defined way, this indicates a 
malfunction of the system and leads to a protection. As the 
observers are only used during start-up, they are described in 
the start-up flow in detail (see section “

5.3 Stepwise Start-up

”). 

The only real hardware protection in this chassis appears in 
case of an audio problem e.g. DC voltage on the speakers. This 
protection will only affect the Class D audio amplifier (item 
7D10; see diagram B03A) and puts the amplifier in a 
continuous burst mode (cyclus approximately 2 seconds).

Repair Tip
•

There still will be a picture available but no sound. While 
the Class D amplifier tries to start-up again, the cone of the 
loudspeakers will move slowly in one or the other direction 
until the initial failure shuts the amplifier down, this cyclus 
starts over and over again. The headphone amplifier will 
also behaves similar.

•

+5V-TUN supply voltage (5V nominal) for tuner and IF 
amplifier.

 
+3V3-STANDY (3V3 nominal) is the permanent voltage, 
supplying the Stand-by microprocessor inside PNX855xx.
 
Supply voltage +1V1 is started immediately when +12V voltage
becomes available (+12V is enabled by STANDBY signal when 
"low"). Supply voltages +3V3, +2V5, +1V8, +1V2 and +5V-TUN 
are switched "on" by signal ENABLE-3V3 when "low", provided 
that +12V (detected via 7U40 and 7U41) is present.

+12V is considered OK (=> DETECT2 signal becomes "high", 
+12V to +1V8, +12V to +3V3, +12V to +5V DC-DC converter 
can be started up) if it rises above 10V and doesn’t drop below 
9V5. A small delay of a few milliseconds is introduced between 
the start-up of 12V to +1V8 DC-DC converter and the two other 
DC-DC converters via 7U48 and associated components.
 
Description DVB-S2:
•

LNB-RF1 (0V = disabled, 14V or 18V in normal operation) 
LNB supply generated via the second conversion channel 
of 7T03 followed by 7T50 LNB supply control IC. It provides 
supply voltage that feeds the outdoor satellite reception 
equipment.

•

+3V3-DVBS (3V3 nominal), +2V5-DVBS (2V5 nominal) 
and +1V-DVBS (1.03V nominal) power supply for the 
silicon tuner and channel decoder. +1V-DVBS is generated 
via a 5V to 1V DC-DC converter and is stabilized at the 
point of load (channel decoder) by means of feedback 
signal SENSE+1V0-DVBS. +3V3-DVBS and +2V5-DVBS 
are generated via linear stabilizers from +5V-DVBS that by 
itself is generated via the first conversion channel of 7T03.

At start-up, +24V becomes available when STANDBY signal is 
"low" (together with +12V for the basic board), when +3V3 from 
the basic board is present the two DC-DC converters channels 
inside 7T03 are activated. Initially only the 24V to 5V converter 
(channel 1 of 7T03 generating +5V-DVBS) will effectively work, 
while +V-LNB is held at a level around 11V7 via diode 6T55. 
After 7T05 is initialized, the second channel of 7T03 will start 
and generates a voltage higher then LNB-RF1 with 0V8. +5V-
DVBS start-up will imply +3V3-DVBS start-up, with a small 
delay of a few milliseconds => +2V5-DVBS and +1V-DVBS will 
be enabled.

If +24V drops below +15V level then the DVB-S2 supply will 
stop, even if +3V3 is still present.

Debugging
The best way to find a failure in the DC/DC converters is to 
check their start-up sequence at power “on” via the mains cord, 
presuming that the stand-by microprocessor and the external 
supply are operational. Take STANDBY signal "high"-to-"low" 
transition as time reference.
When +12V becomes available (maximum 1 second after 
STANDBY signal goes "low") then +1V1 is started immediately. 
After ENABLE-3V3 goes "low", all the other supply voltages 
should rise within a few milliseconds.

Tips
•

Behaviour comparison with a reference TV550 platform 
can be a fast way to locate failures.

•

If +12V stays "low", check the integrity of fuse 1U40.

•

Check the integrity (at least no short circuit between drain 
and source) of the power MOS-FETs before starting up the 
platform in SDM, otherwise many components might be 
damaged. Using a ohmmeter can detect short circuits 
between any power rail and ground or between +12V and 
any other power rail.

•

Short circuit at the output of an integrated linear stabilizer 
(7UC0, 7UD2 or 7UD3) will heat up this device strongly.

•

Switching frequencies should be 500 kHz ...600 kHz for 
12 V to 1.1 V and 12 V to 1.8 V DC-DC converters, 

The Class D-IC 7D10 has a powerpad for cooling. When the IC 
is replaced it must be ensured that the powerpad is very well 
pushed to the PWB while the solder is still liquid. This is needed 
to insure that the cooling is guaranteed, otherwise the Class D-
IC could break down in short time.

To check the AV PIP board (if present) functionality, a 
dedicated tespattern can be invoke as follows: select the 
“multiview” icon in the User Interface and press the “OK” 
button. Apply for the main picture an extended source, e.g. 
HDMI input. Proceed by entering CSM (push ‘123654’ on the 
remote control) and press the yellow button. A coloured 
testpattern should appear now, generated by the AV PIP board 
(this can take a few seconds).

When CSM is activated and there is a USB stick connected to 
the TV, the software will dump the complete CSM content to the 
USB stick. The file (Csm.txt) will be saved in the root of the USB 
stick. If this mechanism works it can be concluded that a large 
part of the operating system is already working (MIPS, USB...)

Description basic board
 
The basic board power supply consists of 4 DC/DC converters 
and 5 linear stabilizers. All DC/DC converters have +12V input 
voltage and deliver:
•

+1V1 supply voltage (1.15V nominal), for the core voltage 
of PNX855xx, stabilized close to the point of load; 
SENSE+1V1 signal provides the DC-DC converter the 
needed feedback to achieve this.

•

+1V8 supply voltage, for the DDR2 memories and DDR2 
interface of PNX855xx.

•

+3V3 supply voltage (3.30V nominal), overall 3.3 V for 
onboard IC’s, for non-5000 series SSB diversities only.

•

+5V (5.15V nominal) for USB, WIFI and Conditional 
Access Module and +5V5-TUN for +5V-TUN tuner 
stabilizer.

 
The linear stabilizers are providing:
•

+1V2 supply voltage (1.2V nominal), stabilized close to 
PNX855xx device, for various other internal blocks of 
PNX855xx; SENSE+1V2 signal provides the needed 
feedback to achieve this.

•

+2V5 supply voltage (2.5V nominal) for LVDS interface and 
various other internal blocks of PNX855xx; for 5000 series 
SSB diversities the stabilizer is 7UD2 while for the other 
diversities 7UC0 is used.

•

+3V3 supply voltage (3V3 nominal) for 5000 series SSB 
diversities, provided by 7UD3; in this case the 12V to 3V3 
DC-DC converter is not present.

Read also section “

5.5 Error Codes

, 

5.5.4 Error Buffer

, 

 Extra 

Info

”.

631

631

631

900 kHz for 12 V to 3.3 V and 12 V to 5 V DC-DC 
converters. The DVB-S2 supply 24 V to 5 V and 24 V to +V 
LNB DC-DC converters operates at 300 kHz while for 5 V 
to 1.1 V DC-DC converter 900 kHz is used.

When an “F” is displayed in the screen’s right corner, this 
means the set is in “Factory” mode, and it normally
happens after a new SSB is mounted. To exit this mode, push 
the “VOLUME minus” button on the TV’s local keyboard for 10 
seconds (this disables the continuous mode).
Then push the “SOURCE” button for 10 seconds until the “F” 
disappears from the screen.

Uart loggings reporting fault conditions, error messages, error 
codes, fatal errors:
•

Failure messages should be checked and investigated.For 
instance fatal error on the PNX51x0: check startup of the 
back-end processor, supplies..reset, I

2

C bus. => error 

mentioned in the logging as: *51x0 failed to start by itself*.

•

Some failures are indicated by error codes in the logging, 
check with error codes table (see Table “

5-2 Error code 

overview

”).e.g. => <<<ERROR>>>PLFPOW_MERR.C : 

First Error (id=10,Layer_1=2,Layer_2=23).

•

 

I

2

C bus error mentioned as e.g.: “ I

2

C bus 4 blocked”.

•

Not all failures or error messages should be interpreted as 
fault.For instance root cause can be due to wrong option 
codes settings => e.g. “DVBS2Suppoprted : False/True.

In the Uart log startup script we can observe and check the 
enabled loaded option codes.
 
Defective sectors (bad blocks) in the Nand Flash can also be 
reported in the logging.

Startup in the SW upgrade application and observe the Uart 
logging:
Starting up the TV set in the Manual Software Upgrade mode 
will show access to USB, meant to copy software content from 
USB to the DRAM.Progress is shown in the logging as follows: 
“cosupgstdcmds_mcmdwritepart: Programming 102400 bytes, 
40505344 of 40607744 bytes programmed”.

Startup in Jett Mode:
Check Uart logging in Jet mode mentioned as : “JETT UART 
READY”.

Uart logging changing preset:
=> COMMAND: calling DFB source = RC6, system=0, key = 4”.

Make sure that the volume is set to minimum during 
disconnecting the speakers in the ON-state of the TV. The 
audio amplifier can be damaged by disconnecting the speakers 
during ON-state of the set!

In case of no picture when CSM (test pattern) is activated and 
backlight doesn’t light up, it’s recommended first to check the 
inverter on the PSL + wiring (LAYER 2 error = 17 is displayed 
in SDM).

Attention: In case the tuner is replaced, always check the tuner 
options!

Attention: In case the SSB is replaced, always check the 
display option code in SAM, even when picture is available. 
Performance with the incorrect display option code can lead to 
unwanted side-effects for certain conditions.

After start-up of the Hyperterminal, fill in a name (f.i. “logging”) 
in the “Connection Description” box, then apply the following 
settings: 
1.

COMx

2.

Bits per second = 115200

3.

Data bits = 8

4.

Parity = none

5.

Stop bits = 1

6.

Flow control = none

During the start-up of the TV set, the logging will be displayed. 
This is also the case during rebooting of the TV set (the same 
logging appears time after time). Also available in the logging 
is the “Display Option Code” (useful when there is no picture), 
look for item “DisplayRawNumber” in the beginning of the 
logging. Tip: when there is no picture available during rebooting 
you are able to check for “error devices” in the logging (LAYER 
2 error) which can be very helpful to determine the failure cause 
of the reboot. For protection state, there is no logging.

Description possible cases: 
 
Uart loggings are displayed:
•

When Uart loggings are coming out, the first conclusion we 
can make is that the TV set is starting up and 
communication with the flash RAM seems to be supported. 
The PNX855xx is able to read and write in the DRAMs.

•

We can not yet conclude : Flash RAM and DRAMs are fully 
operational/reliable.There still can be errors in the data 
transfers, DRAM erros, read/write speed and timing 
control.

 
No Uart logging at all:
•

In case there is no Uart logging coming out, check if the 
startup script can be send over the I

2

C bus (3 trials to 

startup) + power supplies are switched on and stable.

•

No startup will end up in a blinking LED status : error 
LAYER 1 = “2”, error LAYER 2 = “53” (startup with SDM 
solder paths short).

•

Error LAYER 2 = “15” (hardware cause) is more related to 
a supply issue while error LAYER 2 = “53” (software cause) 
refers more to boot issues.

 

 

When something is wrong with the TV set (f.i. the set is reboot-
ing) you can check for more information via the logging in Hy-
perterminal. The Hyperterminal is available in every Windows 
application via Programs, Accessories, Communications, Hy-
perterminal. 

Follow the instructions in the flowchart in case a SSB has to be 
exchanged. See figure “SSB replacement flowchart”.

C onnect the U SB stick to the set, 

go to SAM and save the current TV settings via “Upload to USB”

Set is still oper ating?

Yes

1.  D isconnect the WiF i module fr om  the PC I connector  (only for Q549.x SSB)
2. Replace the SSB by a Service SSB.
3. Place the WiFi module in the PCI connector.
4. Mount the Service SSB in the set.

Set behaviour?

Yes

No

N o

Before starting:
- prepare a USB memory stick with the latest software
- download the latest Main Software (Fus)
- unzip this file
- create a folder ”upgrades” in the root of a USB stick (size > 50 MB) and
  save the autorun.upg file in this "upgrades" folder.
Note: it is possible to rename this file, e.g."S54x_SW_version.upg"; this in
case there are more than one "autorun.upg" files on the USB stick.

No pictur e displayed

Pictur e displayed

Set is starting up without software 
upgrade menu appearing on screen

Pictur e displayed

Set is starting up with software 
upgrade menu appearing on screen 

Due to a possible wrong display option code in the received Service
SSB (NVM), it’s possible that no picture is displayed. Due to this 
the download application will not be shown either. This tree enables you 
to load  the main software step-by-step via the UART logging on the PC
(this for visual feedback).

Start-up the set

1) Start up the TV set, equiped with the Service SSB,

 and enable the UART logging on the PC.

2)  The TV set will start-up automatically in the 

download application if main TV software is not loaded.

3) Plug the prepared USB stick into the TV set. Follow the

instructions in the UART log file, press “Right” cursor key to enter 

the list. Navigate to the “autorun.upg” file in the UART logging

printout via the cursor keys on the remote control. When the

correct file is selected, press 

“Ok”.

4) Press "Down" cursor and “Ok” to start flashing the main

TV software. Printouts like: “L: 1-100%, V: 1-100% and 

P: 1-100%” should be visible now in the UART logging.

5) Wait until the message “Operation successful !” is logged in

the UART log and remove all inserted media. Restart the TV set.

1) Plug the USB stick into the TV set and select 

the “autorun .upg” file in the displayed browser.

2) Now the main software will be loaded automatically,

supported by a progress bar.

3) Wait until the message “Operation successful !” is displayed

and remove all inserted media. Restart the TV set.

Set the correct “Display code” via “062598 -HOME- xxx” where

“xxx” is the 3 digit display panel code (see Table 5-1-2)

After entering the “Display Option” code, the set is going to 

Standby

(= validation of code)

Restart the set

Program set type number, serial number, and di

splay 12 NC

Program E - DFU if needed. 

Go to SAM and reload settings

via “Download from USB” function. 

In case of settings reloaded from USB, the set type,
serial number, display 12 NC, are automatically stored
when entering display options. 

- Check if correct “display option” code is programmed.
- Verify “option codes” according to table 5-1-2.
- Default settings for “white drive” > see Service Manual. 

SSB Board 
Updated  

02-06-2011

If not already done:

Check latest software on Service website.

Update main and Stand-by software via USB. 

Check and perform alignments in SAM according to the

Service Manual. Option codes, colour temperature, etc. 

Final check of all menus in CSM.

Special attention for HDMI Keys and Mac address.

Check if E - D F U is present. 

End  

Attention point for Net TV: If the set type and serial number are not
filled in, the Net TV functionality  will not work . It will not be possible
to connect to the internet. 

Saved settings

on USB stick?