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55LP1M-WC (CHASSIS:CL-80) - LG TV Service Manual (repair manual). Page 22

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6. SOUND TROUBLE SHOOTING
REMARK : POWER CHECK
POWER CHECK OF MSP3420G (U501) : U522(8V), L502(8V), L501(5V), L505(5V) 
POWER CHECK OF TPA3004 (U502) : 18V
CHECK SOUND OF VCR,DVD,PC,SETOP
BOX...
CHECK GMSP3420G(U501) I/O
SIGNAL?
CHECK SOUND INPUT
= PC (J707)
= DTV / DVD (J702)
= VIDEO (SVBS, S-VIDEO) (J701)
CHECK THE PERIPHERAL 
MSP3420G (U501) 
NO IN / OUTPUT SIGNAL
NO PROBLEM
CHECK TPA3004(U502) I/O
SIGNAL?
1. CHECK OUTPUT WAFER(J501)
2. CHECK CONNECTOR CABLE
3. CHECK SPEAKER
CHECK THE PERIPHERAL TPA3004
(U502) 
NO IN / OUTPUT SIGNAL
NO PROBLEM
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