Read LG 42SL8000-ZB / 42SL8500-ZA (CHASSIS:LD91K) Service Manual online
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4. Analog 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 X1202 Clock
31.875MHz ?
Replace MAIN B’D IC1200
YES
NO
MAIN B’ D X1201 Clock
20.25MHz ?
Replace MAIN B’D IC1203
YES
NO
Replace Main board IC100
YES
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
31.875MHz ?
Replace MAIN B’D IC1200
YES
NO
MAIN B’D X1201 Clock
20.25MHz ?
Replace MAIN B’D IC1203
YES
NO
Replace Main board IC100
YES
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