No Tuner Audio Output - LG RH188H Service Manual

7. NO TUNER AUDIO OUTPUT

TU701 pin 16 (SIF) :
Is there a signal?
YES
C928,C963 :
Is there a signal?
YES
IC903,904 pin 7 :
Is there a signal?
A
YES
IC803 pin 20, 24, 23, 27
Is there a signal?
B
YES
IC901 pin 34 Or R999
(reset "H") :
YES
X901 (24.576MHz) clock
oscillated ?
YES
R902,R913,R997 :
R962,R978 (I 2 C) :
YES
C901 pin 173 & R903 :
Is there a signal ?
YES
When playing DISC,
no Audio output
NO
CHECK
IC903,904 pin 6 (12V)
CHECK
NO
IC 803 pin 2,4 (VCC) : 12V
Pin 32,33 (SCL/SDA) :
NO
CHECK
IC1302 Reset Circuit
A Only "P Model"
B Only "Without SCART Model"
NO
IC1101 DEFECT
NO
CHECK
IC901 power 3.3V & 1.8V
YES
IC901 DEFECT
3-10
YES
Replace IC803