No Sound - LG Flatron LM568E Service Manual

NO SOUND

YES
CHECK SPEAKER
ASS'Y?
YES
AUDIO PCB
CHECK INPUT SIGNAL
U3(TDA7449)
PIN7,8?
YES
CHECK
IIC LINE
YES
CHECK
INPUT SIGNAL
U1(TDA7496L)
PIN4,9?
YES
CHECK
OUTPUT SIGNAL
U1(TDA7496L)
PIN14,17?
5. NO SOUND
NO
NO
NO
NO
NO
- 14 -
CHECK SPEAKER
CHECK JACK(J7)
& AUDIO CORD
CHECK MAIN
U501(MICOM)
→AUDIO J3
→U3(TDA7449)
CHECK U3(TDA7449)
CHECK U1(TDA7496L)