LG 42PG6000 Service Manual page 19

6. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display but sound is not output.
(2) Check following
All input(mode) is no
sound?
No
Only HDMI is No
Sound?
Yes
Only RF is no sound?
Yes
Only RF is no sound?
No
Check the Input Sound IN/OUT
AV1(SC1_LIN : R1140, SC1_RIN : R1134)
AV1(SC2_LIN : R1146, SC2_RIN : R1145)
AV3(SIDE_LIN : R1306, SIDE_RIN: R1307 )
PC(PC_LIN: R631, PC_RIN : R630)
Component (COMP_LIN : R1178, COMP_RIN: R1179)
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Yes
No
Download
the EDID data
No
Check the Tuner IN/OUT
TV_L/R_OUT( R356)
Yes
Replace the VSC B/D
Is the speaker On it menu?
1. Menu > Audio > TV Speaker ON/OFF
YES
Is the speaker Cable normal?
1. Isn't damage in the Speaker Cable?
2. Is the Speaker cable connect well form VSC B/D to Speaker.
Yes
IC601(Audio AMP) operates Normal?
1.Check 1.8V, 3.3V, 16V input Voltage (L607, IC601 Pin8, IC601 Pin32)
2.Check the IIC communication (SDA/SCL : R645, R643)
3.Check the Audio Signal is normal.(SPK_L/R : L603, L604, L606, L610)
YES
Replace the VSC Board
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No
Set on speaker in menu.
(TV Speaker OFF ? ON)
No
Change or Reconnect the
Speaker Cable.
No
Replace the Audio AMP IC
(IC601).
LGE Internal Use Only