16
Model No: CT-21FGS1
Version 1.0
b. No
sound
In this kind of failure, first of all we should observe if there is the picture on the CRT. It proves the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound
amplification circuit. The repairing method (B1) may be referred without picture. The detail checking and repairing steps are as follow.
Note: Before repairing, assure that the volume is on and the state of set is in “TV”.
5V
YES
YES
NO
NO
9V
YES
NO
YES
YES
YES
NO
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 53 of N201
Check N202,R231,C214,N201
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin4,15of N252
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 1 of N201
Check R231, C214, N201
Check D901, N252,N203
The voltage on pin 9,10,11of N252
Check 9V-power supply
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 2 of N711
Check VD552,R910,C700,T501,N701
The voltage on pin 16 of N252
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 2,5 of N252
Check C706,C716,N252
Hear if there is the voice liking “Ka…Ka ” in the loudspeaker via using “ Signal-input way ” by touching pin 2 of N701
The voltage on pin 8 of N701
Check N203,N201,V922,R210,R202
Check C706,C705, R203
Check SP301, SP302, N711
NO
9V
9V
24V
NO
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