Daewoo 14Q1 - Manual (Page 43)

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