Service Modes, Error Codes, and Fault FindingFTP2.4E AA5.EN 19
5.6The Blinking LED Procedurefrom the 3V3 supply, which is derived from the 5V Stand-by-
circuitry. Therefore, in both Power-on as in Stand-by mode, the
microprocessor is connected to this power supply.
5.6.1 Introduction
If a fault situation is detected, an error code will be generated
Via this procedure, you can make the contents of the error
and if necessary, the TV is put in protection mode. The
buffer visible via the front LED. This is especially useful for fault
protection mode is indicated by the blinking of the front LED at
finding, when there is no picture.
a frequency of 3 Hz (or by a coded blinking in special cases).
When the SDM is activated, the front LED will show (blink) the The content of the error buffer can be read via the service menu
contents of the error-buffer. Error-codes > 10 are shown as (SAM), the blinking LED procedure or via DST/ComPair.
follows:
- A long blink of 750 ms (which is an indication of the decimal To get a quick diagnosis, this chassis has three service-modes
digit),implemented:
- A pause of 1.5 s,The Customer Service Mode (CSM).
- ?n? short blinks (where ?n? = 1 - 9),The Service Default Mode (SDM). Start-up of the TV in a
- When all the error-codes are displayed, the sequence predefined way.
finishes with a LED blink of 3 s,The Service Alignment Mode (SAM). In this mode, items
- The sequence starts again. of the TV can be adjusted via a menu.
Note: For error codes >100, the first two digits (hundred-and-You can activate both SDM and SAM modes via the ?service
ten) are considered as one digit (one long blink)pads? on the SSB (see figure ?Service pads?), via an RC-
transmitter (DST or standard RC), or via ComPair. It is not
Example: Error 12 9 6 121 0. possible to activate the SAM in ?stand-by?; the TV has to be in
After activation of the SDM, the front LED will show: ?normal operation? mode.
- 1 long blink of 750 ms (which is an indication of the decimal
digit) followed by a pause of 1.5 s,The ?Protection Diagram? shows the structure of the protection
- 2 short blinks followed by a pause of 3 s,system. See diagram below.
- 9 short blinks followed by a pause of 3 s,
- 6 short blinks followed by a pause of 3 s,
DC_PROT (from audio)IRQ-DIGITAL (98)
- 12 long blinks of 750 ms (which is an indication of ?120?)
followed by a pause of 1.5 s,
+8V_CON+8V SENSE (105)
- 1 short blink followed by a pause of 3 s,
- 1 long blink of 3 s to finish the sequence,+5V_CON+5V SENSE (106)
- The sequence starts again.
OTC
Note: If errors 1, 6, or 18 occur, the LED always gives the last
TUNER
occurred error even if the TV is NOT in service mode.
FAST I2C BUS BLOCKED
SLOW I2C BUS BLOCKED
5.6.2 How to Activate
EPLD
+DC/DCI2C
Use one of the following methods:FBXPROTECTION
+
Activate the SDM (only via soldering pads marked ?SDM? 3D COMBE_14650_032.eps
170604
on SSB, see figure ?Service pads?). The blinking front LED
will show the entire contents of the error buffer (this works
Figure 5-7 Protection diagram
in ?normal operation? mode and in ?protection? mode).
Transmit the commands ?MUTE? - ?062500? - ?OK? with a
normal RC. The complete error buffer is shown. Take There are several types of protections:
2
notice that it takes some seconds before the blinking LED IC related protections.
starts.OTC related protections (via polling on I/O pins or via
Transmit the commands ?MUTE? - ?06250x? - ?OK? with a algorithms).
normal RC (where ?x? is a number between 1 and 5). When Hardware protection
All protections are explained below.
x= 1 the last detected error is shown, x= 2 the second last
error, etc.... Take notice that it takes some seconds before
the blinking LED starts.5.7.2 I2C Related Protections
?DIAGNOSE X? with the DST (where ?x? is a number
between 1 and 5). When x= 1 the last detected error is In normal operation, some registers of the I2C controlled ICs
shown, x= 2 the second last error, etc.... When x = 0 all are refreshed every 200 ms. During this sequence, the I2C
errors are shown.buses and the I2C ICs are checked.
2
An IC protection will take place if the SDA and SCL lines are
2
short-circuited to ground, or to each other. An IC error will also
5.7Protections
occur, if the power supply of the IC is missing.
Note: With Samsung PDP displays (SDI V4) boards it is
DC/DC protection: When a 3V3 supply is short-circuited, the
possible that for some errors the blinking LED procedure does
DC/DC converter switches ?off? and goes in protection. The
not start immediately (e.g. error 18). When the error occurs, the
FBX, EPLD IC, and 3D comb IC have no supply voltage and
TV goes to protection and it is possible that you have to wait 30 give no acknowledge. In this case, the TV should go into
seconds before the blinking LED procedure starts.protection. An error code is written in the NVM: DC/DC error.
5.7.1 IntroductionFBX protection: the FBX protection is not available any more.
It is replaced by the DC/DC protection.
This chassis has only one microprocessor (OTC), which
remains active during Stand-by. This because power of the
microprocessor and the attached memory chip set is coming |
ACEC
