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22LK330, 22LK330A, 22LK330N, 22LK330U, 22LK335C (CHASSIS:LD01R) - LG TV Service Manual (repair manual). Page 20

Read LG 22LK330 / 22LK330A / 22LK330N / 22LK330U / 22LK335C (CHASSIS:LD01R) Service Manual online

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10. Digital TV Audio
Check RF Cable & Signal.
Follow procedure 
’9. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703.
Replace L3703.
Check Tuner 1.8V Power. 
IC3703  2 pin : 1.8V
Check IF_P/N Signal
TU3700  10/11  Pin.
Replace IC3703. 
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
11. Analog TV Audio
Check RF Cable & Signal.
Follow procedure
’9. All  source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703.
Replace L3703.
Check Tuner 1.8V Power 
IC3703 2 pin : 1.8V.
Check CVBS Signal
TU3700 8 Pin.
Replace IC3703.
ok
ok
ok
No
No
No
Bad Tubner. Replace Tuner.
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