Read LG 26LH200C / 26LH210C (CHASSIS:LP91Z) Service Manual online
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Check the input
source
IC602 operate
normally?
Check the external
speaker
Replace the external speaker
Re-solder or replace
the IC602
Change input source.
Check the speak wire
YES
YES
YES
NO
NO
NO
Check the IR waveform
of L402
Replace the Preamp of IR ass y.
Check the RS-232C Pin4.
9. Not operate the external speaker out
10. Not operate IR out
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