Error Codes; How To Read The Error Buffer; How To Clear The Error Buffer; Error Buffer - Philips 42PF9731D Service Manual

5.5

Error Codes

5.5.1 Introduction
The error code buffer contains all detected errors since the last
time the buffer was erased. The buffer is written from left to
right, new errors are logged at the left side, and all other errors
shift one position to the right.
When an error has occurred, the error is added to the list of
errors, provided the list is not full or the error is a protection
error.
When an error occurs and the error buffer is full, then the new
error is not added, and the error buffer stays intact (history is
maintained), except when the error is a protection error.
To prevent that an occasional error stays in the list forever, the
error is removed from the list after 50+ operation hours.
When multiple errors occur (errors occurred within a short time
span), there is a high probability that there is some relation
between them.
Basically there are three kinds of errors:
• Errors detected by the Stand-by Processor. These
errors will always lead to protection and an automatic start
of the blinking LED for the concerned error (see paragraph
"The Blinking LED Procedure"). In these cases SDM can
be used to start up (see chapter "Stepwise Start-up").
• Errors detected by VIPER that lead to protection. In this
case the TV will go to protection and the front LED will blink
at 3 Hz. Further diagnosis via service modes is not possible
here (see also paragraph "Error Codes" -> "Error Buffer" -
> "Extra Info").
• Errors detected by VIPER that do not lead to
protection. In this case the error can be read out via
ComPair, via blinking LED method, or in case you have
picture, via SAM.
5.5.2

How to Read the Error Buffer

Use one of the following methods:
• On screen via the SAM (only if you have a picture). E.g.:
Table 5-2 Error code overview
Error Description
1 2
I C1
2
2
I C2
3 2
I C3
4 2
I C4
5 VIPER does not boot
6 5V supply
7 8V6 supply
8 1.2V DC/DC
11 3.3V DC/DC
12 12V supply
14 Audio
16 MPIF1 main supply
17 MPIF1 audio supply
18 MPIF1 ref freq
25 Supply fault
27 PNX2015 HD subsystem part
29 AVIP 1
31 AVIP 2
32 MPIF1
34 Tuner1
37 Channel decoder
39 POD Interface
43 Hi Rate Front End
44 Main NVM
45 Columbus 1
46 Pacific 3
53 VIPER
63 PDP Display (n.a.)
Service Modes, Error Codes, and Fault Finding
Error/Prot Detected by
P VIPER
P VIPER
P Stby µP
P VIPER
P Stby µP
P Stby µP
P Stby µP
P Stby µP
P Stby µP
P Stby µP
P Stby µP
E VIPER
E VIPER
E VIPER
P Stby µP
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
E VIPER
P Stby µP
P VIPER
BJ2.4U/BJ2.5U LA
– 00 00 00 00 00: No errors detected
– 06 00 00 00 00: Error code 6 is the last and only
detected error
– 09 06 00 00 00: Error code 6 was first detected and
error code 9 is the last detected error
• Via the blinking LED procedure (when you have no
picture). See next paragraph.
• Via ComPair.
5.5.3

How to Clear the Error Buffer

Use one of the following methods:
• By activation of the "RESET ERROR BUFFER" command
in the SAM menu.
• With a normal RC, key in sequence "MUTE" followed by
"062599" and "OK".
• If the content of the error buffer has not changed for 50+
hours, it resets automatically.
5.5.4

Error Buffer

In case of non-intermittent faults, clear the error buffer before
you begin the repair (before clearing the buffer, write down the
content, as this history can give you significant information).
This to ensure that old error codes are no longer present.
If possible, check the entire contents of the error buffer. In
some situations, an error code is only the result of another error
code and not the actual cause (e.g., a fault in the protection
detection circuitry can also lead to a protection).
There are several mechanisms of error detection:
• Via error bits in the status registers of ICs.
• Via polling on I/O pins going to the stand-by processor.
• Via sensing of analogue values on the stand-by processor.
• Via a "not acknowledge" of an I
Take notice that some errors need more than 90 seconds
before they start blinking. So in case of problems wait 2
minutes from start-up onwards, and then check if the front LED
is blinking.
Device Defective module
n.a. 2
I C1_blocked
n.a.
2
I C2_blocked
n.a. /
n.a. 2
I C4_blocked
PNX8550 /
n.a. /
n.a. /
n.a. /
n.a. /
n.a. /
/ /
/ /
/ /
PNX3000 IF I/O
/
/ /
/ /
/ /
PNX3000 /
/ Tuner 1
NXT2003 /
STV701 /
TDA9975 HDMI
M24C64 /
PNX2015 Comb filter
/ /
PNX8550 /
/ Display
5. EN 33
2
C communication
Result
Protection + 3 Hz blinking
Protection + 3 Hz blinking
Protection + Error blinking
Protection + 3 Hz blinking
Protection + Error blinking
Protection + Error blinking
Protection + Error blinking
Protection + Error blinking
Protection + Error blinking
Protection + Error blinking
Protection + Error blinking
see extra info
see extra info
Error logged
Protection + Error blinking
see extra info
see extra info
see extra info
Error logged
Error logged
Error logged
Error logged
Error logged
Error logged
Error logged
TV to stand-by + Error logged
Protection + Error blinking
Protection + 3 Hz blinking