Via this procedure, you can make the contents of the error
buffer visible via the front LED. This is especially useful when there is no picture.
When the SDM is entered, the LED will blink the contents of
the error-buffer.
Error-codes greater than or equal to 10 are shown as
follows:
- a long blink of 750 ms (which is an indication of the decimal digit),
- a pause of 1.5 s,
- n short blinks (n = 1 - 9),
- when all the error-codes are displayed, the sequence; finishes with a LED blink of 3 s,
- the sequence starts again.
After entering SDM:
1 long blink of 750 ms followed by a pause of 1.5 s,
2 short blinks followed by a pause of 3 s,
9 short blinks followed by a pause of 3 s,
6 short blinks followed by a pause of 3 s,
1 long blink of 3 s to finish the sequence,
the sequence starts again.
How to Clear the Error Buffer
The error code buffer is cleared in the following cases:
By activation of the CLEAR command in the SAM menu:
- When you exit SDM / SAM with the STANDBY command on the remote control (when leaving SDM / SAM, by disconnecting the set from AC power, the error buffer is not reset).
- When you transmit the command DIAGNOSE-99-OK with ComPair.
- If the content of the error buffer has not changed for 50 hours, it resets automatically.
In case of non-intermittent faults, clear the error buffer
before you begin the repair. These 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).
The error code buffer contains all detected errors since the
last time the buffer was erased. The buffer is written from left to right. When
an error occurs that is not yet in the error code buffer, it is written at the
left side and all other errors shift one position to the right.
Error
|
Device
|
Error description
|
Def. Item
|
0
|
Not applicable
|
No error
|
|
1
|
Not applicable
|
x-ray overvoltage protection [USA only]
|
2465, 7460
|
2
|
Not applicable
TDA8359/TDA9302
|
Horizontal protection
Vertical protection
|
7460, 7461, 7462, 7463, 7467
7861,vlot aux +13V
|
3
|
Reserve
|
||
4
|
MSP34X5/TDA9853
|
MSP I2C identification error
|
7831/7861
|
5
|
TDA95XX
|
POR 3v3/+8V protection
|
7200,7560,7480
|
6
|
I2C bus
|
General I2C bus error
|
7200, 3624, 3625
|
7
|
AN7522/3
|
Power down [over current] protection
|
7901, 7902, 7561
|
8
|
Not applicable
|
E/W protection (large screen)
|
7400,3405,3406,3400
|
9
|
M24C08
|
NVM I2C identification error.
|
7602, 3611,3603/04
|
10
|
Tuner
|
Tuner I2C identification error
|
7482,1000
|
11
|
TDA6107/8
|
Back current loop protection
|
7330 RGB amps, CRT.
|
12
|
M65669
|
PIP I2C identification error
|
7803
|
If a fault situation is detected an error code will
be generated and if necessary, the set will be put in the protection mode.
Blinking of the red LED at a frequency of 3 Hz indicates the protection mode.
In some error cases, the microprocessor does not put the set in the protection
mode. The error codes of the error buffer can be read via the service menu
(SAM), the blinking LED procedure or via ComPair. The DST diagnose
functionality will force the set into the Service standby, which is similar to
the usual standby mode, however the microprocessor has to remain in normal
operation completely.
REPAIR TIPS
- Set is dead and makes hiccupping sound‘ MainSupply’ is available. Hiccupping stops when de-soldering L5561, meaning that problem is in the ‘Main Supply’ line. No output voltages at LOT, no horizontal deflection. Reason: line transistor TS7460 is defective.
- Set is dead, and makes no sound Check power supply IC7520. Result: voltage at pins 1, 3, 4, 5 and 6 are about 180 V and pin 8 is 0 V. The reason why the voltage on these pins is so high is because the output driver (pin 6) has an open load. That is why MOSFET TS7521 is not able to switch. Reason: feedback resistor 3523 is defective.
- Set is in hiccup mode and shuts down after 8 s. Blinking LED (set in SDM mode) indicates error 5. As it is unlikely that uP ‘POR’ and ‘+8V protection’ happen at the same time, measure the ‘+8V’. If this voltage is missing, check transistor TS7480.
- Set is non-stop in hiccup mode Set is in over current mode; check the secondary sensing (opto coupler 7515) and the ‘Main Supply’ voltage. Signal ‘Stdby_con’ must be logic low under normal operation conditions and goes to high (3.3 V) under standby and fault conditions.
- Set turns on, but without picture and sound The screen shows snow, but OSD and other menus are okay. Blinking LED procedure indicates error 11, so problem is expected in the tuner (pos. 1000). Check presence of supply voltages. As ‘Vlotaux+5V’ at pin 5 and 7 are okay, ‘VT_supply’ at pin 9 is missing. Conclusion: resistor 3460 is defective.
- Set turns on, but with a half screen at the bottom. Sound is okay Blinking LED (set in SDM mode) indicates error 3. Check ‘Vlotaux+13V’ and ‘+50V’. If they are okay, problem is expected in the vertical amplifier IC7471. Measure with a scope the waveform on pin 17 of the UOC. Measure also at pin 1 of IC7471. If here the signal is missing, a defective resistor R3244 causes the problem.
