LG SPH2B-P - Troubleshooting Common Issues; Unit Not Working or No Power; No Sound or Display Problems; Remote Control and Auto Power Issues

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ELECTRICAL TROUBLESHOOTING GUIDE
1. SMPS PART (POWER ON)
Start (AC In)
Check the F1, U1, R24, R25, R26.
Voltage between pin1 & 2 of the CN21
is whether 21 V?
Please check the Main board.
Repair the components described above.
Check the RS1, R9, C8.
NO
NO
YES (Clear)
NOClear