- SET DEAD. MALES HICCUPPING SOUND
Main power supply is available. Hiccupping stops when desoldering L5563. If so, the problem is in the "Main Supply" line. No output voltages at the line output transformer, No horizontal deflection.
Reason: The line output transistor 7421 is defective.
2. SET DEAD. NO SOUND.
Check power supply regulator control IC [IC7520].
Voltages at pins 2,6,7,9&11 are about 180V, and pin 14 is [0V]. There reason shy the voltages of these pins high is because of the output driver pin [11] has an open load. That is why, the MOSFET 7521 is not able to switch. Check and replace the feed back resistor 3523. Be careful measuring on the Gate of 7521; circuitry is vary high ohmic and can easly be damged.
3. SET IN HICCUP MODE AND SHUTS DOWN AFTER 8 BLINKS OF STANDBY LIGHT.
Blinking LED [set in SDM mode], indicates error '5'. As it is unlikely that the 'POR' and +8V protection, happen at the same time, measure the +8V. If this voltage is missing , check transistors 7491 & 7496.
4. 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 Standby-con must be Logic low under normal operating conditions, and goes to High (3.3V), under standby and fault conditions.
5. SET TURNS ON, BUT WITHOUT PICTURE AND SOUND.
The screen shows snow, OSD and other Menus are OK. Blinking LED procedure indicates error [11]. The problem is expected in the tuner. Check the supply voltages. AS Volt AUX = +5V, at pin 5 and 7 are Ok. VT supply at pin 9 is missing. Check resistor 3449 & 3450.
LED BLINKING CODES.
- When the SDAM is entered, the LED will blink the contents of error buffer.
- n Short blinks (n=1-14)
- When all error codes are displayed, the sequence finishes with a LED blink of 3s.
- The sequence starts again.
Example of error buffer: 12 9 6 0 0.
After entering SDAM:
- 12 short blinks followed by a pause of 3s
- 9 short blinks followed by a pause of 3s
- 6 short blinks followed by a pause of 3s
- 1 long blink of 3s to finish the sequence
- The sequence starts again.
