LG 32LY340C, Service Manual

Page: 18 / 37

- 18 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Check the speaker menu
(menu -> sound -> TV speaker)
Check the voltage of AMP IC(IC3400)
24V_AMP, 3.3V
Check the Mstar Audio_Master_CLK signal
R295
Check the AMP I2C Line
R140, R141
Check the Mstar I2S output
IC501 9, 10, 11pin
Exchange the Mstar(IC101)
Or Main board
Check the I2C signal or
Exchange the Mstar(IC101)
Check the I2C signal or
Exchange the Mstar(IC101)
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check the Audio output signal
IC501 20, 21, 22, 4pin
Exchange the Audio AMP
IC3400
No
Check the connector P3401 Exchange the connector If
the connector is defect
No
Check the Speaker resistor or connector
Exchange the speaker
No
Menu toggle No
Exchange the AMP IC or
Main board
No
8. Audio of All input
Check the RF cable of RF signal
Check the voltage of Tuner 3.3V : L3701,2,4
Check the voltage of Tuner 1.2V
IC3701 5pin : 1.2V
Check the IF_P/N signal TU3700 10/11pin
Implement the “8. Audio of all input”
Of Malfunction guide
Exchange the IC3701
Exchange the Tuner
No
No
Yes
Yes
Yes
Yes
Menu toggle
No
Exchange the L3701,2,4
No
9. TV Audio