LG 32LG7000 Service Manual page 21

2-9. In case of No sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
(2) Check the followings
All input(mode) is no sound?
No
Only HDMI is No sound?
No
Only RF is no sound?
No
Only AV/component/PC
input is no sound?
No
Check the Input Sound IN/OUT
AV1 (R : JK100 pin2 and C679
L : JK100 pin6 and C692)
AV2 (R : JK101 pin2 and C690
L : JK101 pin2 and C690)
AV3 (R : JK103 pin7 and C616
L : JK103 pin8 and C615)
PC (PC_LIN : 635, PC_LIN : R634)
Component
(R: JK102 pin3E and C614
L : JK102 pin5D and C613)
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Only for training and service purposes
Yes
Is the speaker on it menu?
1. Menu > Audio > TV Speaker ON/OFF.
Yes
Download the EDID data.
Yes
Check the Tuner IN/OUT
SIF : R317, SECAM-L : R326
Yes
Replace Main B/D.
Is the speaker Cable normal?
1. Isn't damage in the Speaker Cable?
2. Is the Speaker cable connect well form
Main B/D to Speaker.
IC601(Audio AMP) operates Normal?
1. Check 16V input Voltage. (IC600 pin49~52)
2. Check 1.8V input Voltage. (IC600 pin12, 13, 16)
3. Check the IIC communication. (SDA/SCL : R619, R620)
4. Check the Audio Signal is Normal. (SPK_L/R : L603, L604)
Yes
Yes
Yes
Replace Main B/D.
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No
Set on speaker in menu.
(TV Speaker OFF -> ON)
No
Change or Reconnect
the Speaker Cable.
No
Replace Audio
AMP IC(IC600).
LGE Internal Use Only