Fault Finding And Repair Tips; Remark On The Supply Errors; Protections During Start-Up; Guidelines Uart Logging - Philips QV14.1E Service Manual

EN 32 5. QV14.1E LA
• Related to supplies: presence of the +5V,+2V5, +1V5,
+1V2 and +1V0 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-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 optimize 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
5.8

Fault Finding and Repair Tips

Read also section "5.5 Error
Info".
5.8.1 Ambilight
Due to the aging process of the LED's fitted on the Ambilight
module, there can be a difference in the colour and/or light
output of the spare ambilight modules in comparison with the
originals ones contained in the TV-set. Via SAM=> ambilight,
the spare module can be fine-tuned.(Brightness)
5.8.2 CSM
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.xml) will be saved under folder "CSM"
of the USB stick. If 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 7.3.1.
5.8.4 Exit "Factory Mode"
This mode can be recognized as state of no respons on any
random remote control request, this mode manifest by flashing
LED, visualized in front of the TV.
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 to exit the
"Factory mode".
5.8.5 Logging
When something is wrong with the TV-set (f.i. the set is
rebooting) you can check for more information via the logging
in Hyperterminal. The Hyperterminal is available in every
Windows application via Programs, Accessories,
Communications, Hyperterminal. Connect a "ComPair
UART"-cable (3138 188 75051) from the service connector in
the TV-set to the "multi function" jack at the front of ComPair II
box.
Required settings in ComPair before starting to log:
- Start up the ComPair application.
2014-Oct-22
Service Modes, Error Codes, and Fault Finding
"5.3 Start-up").
Codes, 5.5.4 Error Buffer, Extra
- Select the correct database (open file "QFUX.X", this will set
the ComPair interface in the appropriate mode).
- Close ComPair
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 over and over). 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.
5.8.6

Guidelines Uart 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 Marvell processor 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 errors, read/write speed and timing
control.
Uart loggings reporting fault conditions, error messages, error
codes, fatal errors:
• Some failures are indicated by error codes in the logging,
check with error codes table (see Table
overview"). e.g. => <<<ERROR>>>PLFPOW_MERR.C :
First Error (id=10,Layer_1=2,Layer_2=23).
2
• I C bus errors.
• Not all failures or error messages should be interpreted as
fault. For instance root cause can be due to wrong option
codes settings.
5.8.7 Loudspeakers
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!
5.8.8 Power Supply
In case of no picture, during CSM (test pattern) is invoked and
no backlight supported, it's recommended first to check the
LED drivers on the power supply.
Attention point for cable handling: (dis)connection for power
cable (power supply <=> SSB) should always be executed
without any bending or mechanical stress on the outisdes of
the connector.Risk of double pins inside the connector should
be avoid in this way.
5.8.9 Display option code
Attention: In case the SSB is replaced, always check the
display option code number (group 2, first option number e.g.
"44855") in SAM, even when picture is available. Performance
with the incorrect display option code can lead to unwanted
side-effects for certain conditions.
back to
div. table
"5-1 Error code