Daewoo 14Q1 Service Manual page 43

5. NO SOUND(PICTURE OK)
NORMAL
ABNORMAL
CHECK / REPLACE
D813, C821
NG
CHECK POWER
PART CIRCUITS
CHECK AUDIO SIGNAL
AT PIN15 OF I501
ABNORMAL
CHECK MUTE VOLTAGE
AT PIN20 OF I701
*MUTE : HIGH
NORMAL
CHECK SIF SIGNAL
AT PIN1 OF I501
NORMAL
CHECK / REPLACE I501
CHECK AUDIO SIGNAL
AT PIN3(TDA7056)
[AT PIN 1&9(TDA1519B)]
NORMAL
CHECK VOLTAGE Vcc(+15Vdc)
OK
AT PIN2(TDA7056)
[AT PIN7(TDA1519B)]
CHECK AUDIO OUTPUT SIGNAL
AT PIN6 & 8(TDA7056)
[AT PIN4 & 6(TDA1519B)
NORMAL
CHECK / REPLACE
SP01(TDA7056)
[SP01 & SP02(TDA1519B)]
OK
ABNORMAL
CHECK /REPLACE
R619, C602, Q604
D605, Q606, I701
ABNORMAL
CHECK SIGNAL WAVEFORM
AT PIN6 OF I501
[REFER TO WAVEFORM ]
NORMAL
CHECK / REPLACE
Q501, R602, R603
Q605 & PERI. COMP
ABNORMAL
CHECK / REPLACE
I601(TDA7056)
[I601(TDA1519B]
44
ABNORMAL
CHECK / REPLACE
TUNER, SAW FILTER
Q101, Q102 & PERI. COMP