LG 42LN5700 Service Manual page 76

Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
21
22
23 B. Power error_No power
24
25
B. Power error_Off when on, off while
26
viewing
B. Power error_Off when on, off while
27
viewing
28
C. Audio error_No audio/Normal video
29
C. Audio error_Wrecked
30
audio/discontinuation
D. Function error_ No response in remote
31
controller, key error
32 D. VCOM Adjustment
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Only for training and service purposes
Error symptom Content
Check front display LED
Check power input Voltage & ST-BY 3.5V
Checking method when power is ON
POWER BOARD voltage measuring method
POWER OFF MODE checking method
POWER BOARD PIN voltage checking method
Checking method in menu when there is no
audio
Voltage and speaker checking method when
there is no audio
Voltage and speaker checking method in case of
audio error
Remote controller operation checking method
Sequence of the Vcom adjustment
16 / 97
Continued from previous page
Page Remarks
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A27
A28
LGE Internal Use Only