No Screen On; No Video - Digital Tv - LG 28LB45 series Service Manual

2. No Screen on

Module Back Light On?
Yes
Check Panel Power 12V. (P600 #30)
Check IC800 Output 12V.
Yes
Check Panel input Clock
P601.(#9, #10)
Yes
Check FFC Cable for Damage or Open
Conductors.
Yes
Replace T-Con Board or Module.

3. No Video - Digital TV

Check RF Cable.
Yes
1. Check RF IC(L2606) Power.(3.3V)
2. Check IC401 Output voltage.(3.3V)
Yes
Check SCL/SDA Line.(TU2603 #4, #5)
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Only for training and service purposes
No
Check WLED_ENABLE
High?
Yes
Check LED Driver Output.
(C1024)
No
Replace IC400 &Recheck.
No
Check IC100.
Repair Main B/D.
No
Replace Cable.
No
Replace IC401 & Recheck.
No
Replace TU2603 or IC101.
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Yes
Check IC101.
Replace Main SOC.
No
Check IC1001 & Q1002.
Replace LED Driver IC or FET.
LGE Internal Use Only