Philips 26HFL4372D/10 Service Manual Download

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Service Modes, Error Codes, and Fault Finding

•

Via the blinking LED procedure. See section

5.5.3 How to

Clear the Error Buffer

•

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.

•

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
starting to repair (

before

clearing the buffer, write down the

content, as this history can give 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 analog values on the stand-by processor or
the PNX85500.

•

Via a “not acknowledge” of an I

C communication.

Take notice that some errors need several minutes before they
start blinking or before they will be logged. So in case of
problems wait 2 minutes from start-up onwards, and then
check if the front LED is blinking or if an error is logged.

Table 5-2 Error code overview

Extra Info

•

Rebooting.

When a TV is constantly rebooting due to

internal problems, most of the time no errors will be logged
or blinked. This rebooting can be recognized via a ComPair
interface and Hyperterminal (for Hyperterminal settings,
see section “

5.8 Fault Finding and Repair Tips

5.8.7

Logging

). It’s shown that the loggings which are generated

by the main software keep continuing. In this case
diagnose has to be done via ComPair.

•

Error 13 (I

C bus 3, SSB bus blocked)

. Current situation:

when this error occurs, the TV will constantly reboot due to
the blocked bus. The best way for further diagnosis here, is
to use ComPair.

•

Error 14 (I

C bus 2, TV set bus blocked)

. Current

situation: when this error occurs, the TV will constantly
reboot due to the blocked bus. The best way for further
diagnosis here, is to use ComPair.

•

Error 18 (I

C bus 4, Tuner bus blocked)

. In case this bus

is blocked, short the “SDM” solder paths on the SSB during
startup, LAYER error 2 = 18 will be blinked.

•

Error 15 (PNX8550 doesn’t boot)

. Indicates that the main

processor was not able to read his bootscript. This error will
point to a hardware problem around the PNX8550
(supplies not OK, PNX 8550 completely dead, I

C link

between PNX and Stand-by Processor broken, etc...).
When error 15 occurs it is also possible that I

C1 bus is

blocked (NVM). I

C1 can be indicated in the schematics as

follows: SCL-UP-MIPS, SDA-UP-MIPS.

Other root causes for this error can be due to hardware
problems regarding the DDR’s and the bootscript reading
from the PNX8550.

•

Error 16 (12V)

. This voltage is made in the power supply

and results in protection (LAYER 1 error = 3) in case of
absence. When SDM is activated we see blinking LED
LAYER 2 error = 16.

•

Error 17 (Invertor or Display Supply)

. Here the status of

the “Power OK” is checked by software, no protection will
occur during failure of the invertor or display supply (no
picture), only error logging. LED blinking of LAYER 1
error = 3 in CSM, in SDM this gives LAYER 2 error = 17.

•

Error 21 (PNX51X0)

. When there is no I

C communication

towards the PNX51X0 after start-up, LAYER 2 error = 21
will be logged and displayed via the blinking LED
procedure if SDM is switched on. This device is located on
the 200 Hz panel from the display.

•

Error 23 (HDMI)

. When there is no I

C communication

towards the HDMI mux after start-up, LAYER 2 error = 23
will be logged and displayed via the blinking LED
procedure if SDM is switched on.

•

Error 24 (I2C switch)

. When there is no I

communication towards the I

C switch, LAYER 2

error = 24 will be logged and displayed via the blinking LED
procedure when SDM is switched on. Remark: this only
works for TV sets with an I

C controlled screen included.