Sanyo CE14A2-C - No Error Indication

Service manual CHASSIS 2112-Series EC7-A
31
7.7.5 No error indication.
THE TV SET DOES NOT START AND THE LED
DOES NOT SHOW ERROR INDICATIONS
Is the led always 'ON'
Give order "ON" by local
keyboard (press V+ or V- keys)
Check the supply of IC100
Check the reset of IC100
Check the oscillator of IC100
Check the IC100
OK
OK
The TV set remains stopped
Yes
OK
Check:
- Q650
- Possible short-circuits at
secondaries windings
Is the power supply in protect
mode? (It sound like a "grig"?)
Is there a voltage
level in secondaries windings?
Check +5V_M
No
Yes
Possible failure of IC800
Is R822 fused?
- Probable failure of Q800 (N.1)
- Probable failure of secondary diodes
No
Yes
Does the led make ON/OFF cycles?
(do not mistake for ERROR_1)
No
No
The protection is performing
due to overvoltage
Yes
- Check B6
- Check Q801 and its periphery
- Check the voltage at pin 14 of IC800
- N.1: If there is a failure of Q800, it is strongly recommended to replace IC800, R820, R821, R817 and R819
Check:
- Mains supply (+BM)
- Supply IC800 (B5)
No
OK
The line stage is doing start/stop cycles
and led makes a blink every 2.3 seconds?
No
Check:
- Mains voltage
- The circuit formed by Q100 and periphery
The -PD signal is activated Yes
Yes