Read LG 47SL9000-ZA / 47SL9500-ZB (CHASSIS:LD91L) Service Manual online
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3. Digital TV Video Problem
Check RF Cable
MAIN B'D L821 = 5V ?
YES
MAIN B'D C894 = 3.3V ?
NO
Replace MAIN B'D IC809
YES
NO
Replace MAIN B'D IC808
MAIN B'D C870= 1. 8V ?
Replace MAIN B'D IC811
YES
NO
MAIN B'D L1211 = 1. 2V ?
Replace MAIN B'D IC1202
YES
NO
MAIN B'D X1202 Clock
31.8 75MHz ?
Replace MAIN B'D IC1200
YES
NO
MAIN B'D X1201 Clock
20.2 5MHz ?
Replace MAIN B'D IC1203
YES
NO
Replace Main board IC100
YES
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