LG 29FU1RNX Service Manual page 17

3. NO POWER ON
Check ST_3.3V of IC100 #170,208..
ST_1.8V of IC100 #1561719..
Check IC100 #206,207
(OSC)
Check IC001#203,204 (SCL,SDA)
Check IC100 #134 (ABN)
Check IC100 #154 ( IR ),
#143/144 (Key In)
NO
Check MAIN Board of Power Line
NO
NO
Replace R323,R325
LOW
Check Abnormal Circuit
NO
Check Digital P105,P107
connector
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Replace X100