Philips 55PUS8601/12, Service Manual

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Service Modes, Error Codes, and Fault Finding EN 32 QM15.1E LA 5.
2016-May-09
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• Activate SAM. The blinking front LED will show the entire
content of the LAYER 2 error buffer, this works in “normal
operation” mode.
5.7 Protections
5.7.1 Software Protections
Most of the protections and errors use either the standby
microprocessor or the SOC 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: voltage presence 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 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-set 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 “
5.2 Stepwise Start-up ”).
5.8 Fault Finding and Repair Tips
Read also section “ 5.5 Error Codes , 5.5.1 Error Code Buffer ,
Extra Info ”.
5.8.1 AmbiLight
There might be a difference in colour and/or light output of
spare AmbiLight modules and of the original modules. This is
due to the aging process of LED’s fitted on the AmbiLight
module.
Fine-tune the spare module via SAM => AmbiLight
(Brightness).
5.8.2 CSM
When CSM is activated and there is an USB stick connected to
the TV set, then the software will collect the complete CSM
content in a file Csm.xml and dump the file in a folder “CSM” on
the USB stick.
When this mechanism works it can be concluded that a large
part of the operating system is already working (SOC, USB ...)
5.8.3 Power Supply Unit
For fault finding tips, refer to section 7.2 .
5.8.4 Guidelines Uart logging
Possible cases
Uart loggings are displayed:
•
We can conclude that the TV-set is starting up and that
communication with the flash RAM seems to be supported.
The processor is able to read and write in the DRAMs.
• We can not yet conclude that flash RAM and DRAMs are
fully operational/reliable.There still can be errors in the data
transfers, DRAM errors, read/write speed and timing
control.
Uart loggings report fault conditions, error messages, error
codes and fatal errors:
•
Some failures are indicated by error codes in the logging,
check referring to “
5-4 Error Code Overview ”.
• I
2
C bus errors.
• Not all failures or error messages should be interpreted as
fault. For instance the root cause can be wrong option
codes settings.
5.8.5 Loudspeakers
Make sure that the volume is set to minimum when the
speakers are disconnected while the TV is ON, because then
the audio amplifier might get damaged.
5.8.6 Power Supply
If there is no picture, during CSM (test pattern) is invoked and
no backlight supported, then it’s recommended to first check
the LED drivers on the power supply board.
Attention: Incorrect cable handling might cause double pins
inside the connector.
When (dis)connecting the power cable from the supply to the
SSB make sure not to bend the cable or not to put mechanical
stress on the outside of the connector.
5.8.7 Display Option Code
Attention: When replacing the SSB, always check the display
option code number (group 2, first option number e.g. “44855”)
in SAM, even when a picture is available.
Performance with incorrect display option code might lead to
unwanted side-effects in certain conditions.
Also supported in this chassis:
The display option code can be changed by special SAM
command 062598 HOME XXX (with XXX: display option in
three digits).