Philips 32PFL5604H/12 Service Manual page 28

EN 28 5. Q543.3E LA
5.8.6 UART Logging
When something is wrong with the TV set (f.i.the set is
rebooting) checking the UART logging using hyperterminal can
be done to find more information. Hyperterminal is a standard
Windows application. It can be found via Programs,
Accessories, Communications, Hyperterminal. Connect a
"ComPair UART"-cable (3138 188 75051) from the Service
connector in the TV set, via the ComPair interface (this is
compulsory, otherwise ICs are blown in the PC), to the
"COMx"-port of the PC. After start-up of 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 reboot, it is
possible to check for "error devices" in the logging (LAYER 2
error). This can be very helpful to determine the failure cause
of the reboot. For protection state, there is no logging.
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! Sometimes the set can go into
protection, but that is not always the case.
5.8.8 Tuner
Attention: In case the tuner is replaced, always check the tuner
options!
5.8.9 Display option code
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.
See also Table 6-3 for the code.
5.8.10 Upgrade HDMI EDID NVM
To upgrade the HDMI EDID, see ComPair for further
instructions.
5.8.11 Upgrade VGA EDID NVM
To upgrade the VGA EDID NVM, pin 7 of the EDID NVM [2] has
to be short circuited to ground. See ComPair for further
instructions.
2010-Jun-29
Service Modes, Error Codes, and Fault Finding
2 1
SDM EDID
Figure 5-10 VGA EDID NVM
18440_201_090225.eps
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