LG CJ65 - Pwm Modulation Check

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ELECTRICAL TROUBLESHOOTING GUIDE
5. PWM MODULATION CHECK
PWM MODULATION PART
CHECK
• Check IC700(TAS5548) VDD 3.3 V - Pin9,14.35,50.
• Check X700 (12.288 MHz).
Replace X700(12.288 MHz).
Replace IC700.
Refer to CD troubleshooting.
Check each line resistor output.
OK
OK
OK
Check IC700 Pin21 CLK input.
Refer to
SMPS troubleshooting.
Check
CN102 Pin13, 14
(12 VA)
Check
X700(12.288 MHz)
operation.
Check
IC700(TAS5548) input
data Pin24, 25
PWM wave.
Check X700
(12.288 MHz).
Check IC700.
Check PWM
modulator output
FL: Pin48(-),49(+)
FR: Pin46(-),47(+).
Other output
check.
Check CD
Assy communication
Pin22, 23, 24.
Check
IC700 input
data.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK