LG 42LN5700 Service Manual page 69

Standard Repair Process
Error
LCD TV
symptom
Check outlet
Check A/C cord
Check for all 3- phase
power out
Fix A/C cord & Outlet
and check each 3
phase out
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Only for training and service purposes
B. Power error
Off when on, off while viewing, power auto on/off
☞A22
N
Check Power Off
Error?
Mode
Y
CPU
Abnormal
Abnormal
1
☞A19
(If Power Off mode is
not displayed)
Check Power B/D
voltage
※ Caution
Check and fix exterior
Replace Power B/D
of Power B/D Part
* Please refer to the all cases which can be displayed on power off mode.
Click the below Hyper_link
9 / 97
Established
2012. 12 .21
date
Revised date
Replace Main B/D
Replace Power B/D
Y
Normal
Replace Main B/D
voltage?
N
7/13
Y
Normal?
End
N
LGE Internal Use Only