55LN5700 (CHASSIS:LT33B) - LG TV Service Manual (repair manual). Page 76

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Contents of LCD TV Standard Repair Process Detail Technical Manual
Continued from previous page
No.
Error symptom
Content
Page
Remarks
21
B. Power error_No power
Check front display LED
A17
22
Check power input Voltage & ST-BY 3.5V
A18
23
Checking method when power is ON
A19
24
POWER BOARD voltage measuring method
A5
25
26
B. Power error_Off when on, off while 
viewing
POWER OFF MODE checking method
A22
27
B. Power error_Off when on, off while 
viewing
POWER BOARD PIN voltage checking method
A19
28
C. Audio error_No audio/Normal video  
Checking method in menu when there is no 
audio
A24
29
Voltage and speaker checking method when 
there is no audio 
A25
30
C. Audio error_Wrecked 
audio/discontinuation
Voltage and speaker checking method in case of 
audio error
A25
31
D. Function error_ No response in remote 
controller, key error
Remote controller operation checking method
A27
32
D. VCOM Adjustment
Sequence of the Vcom adjustment
A28
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