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22LN4600 (CHASSIS:LE33A) - LG TV Service Manual (repair manual). Page 32

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5. TROUBLE SHOOTING – NO VIDEO : DIGITAL TV
1.  Check tuner(TU6401  #5 #12 #32 #54) Power 3.3V
2.  Check IC 2405 output voltage
Replace IC2405
1 Check tuner(TU6401 #7 #13 )Power 1 8V
Replace IC6403
1.  Check tuner(TU6401  #7 #13 )Power 1.8V
2.  Check IC6403  output voltage(1.8V)
Replace IC6403
Check Tuner(TU6401) I2C signal
#3 # 4 #34 #35 #52 #53
Check Tuner(TU6401)
DATA, CLK, SYN, VAL
Replace TU6401
And recheck
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