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60 / 153

Check technical 
information
- Fix information
- S/W  Version

N

Y

Technical 

information?

Check 
input 
signal

Signal

input?

Y

N

External Input and

Component

Recognition error

Check and fix 
external device/cable

RGB,HDMI/
DVI, Optical

Recognition error

Replace Main B/D

Replace Main B/D

Fix in 

accordance 

with technical 

information

61 / 153

Check 
location of 
noise

Identify 
nose type

Replace PSU(with LED driver)

Replace LED driver 

Check location of 
noise

OR

※ When the nose is severe, replace the module
(For models with fix information, upgrade the S/W or 
provide the description)

OR

※ If there is a “Tak Tak” noise from the cabinet, 
refer to the KMS fix information and then proceed 
as shown in the solution manual
(For models without any fix information, provide 
the description)

OR

※ Mechanical noise is a natural 
phenomenon, and apply the 1st level 
description. When the customer does not 
agree, apply the process by stage. 
※ Describe the basis of the description in 
“Part related to nose” in the Owner’s Manual.

62 / 153

Replace module

Zoom part with 
exterior damage

Replace cabinet

Replace remote controller

Replace stand

☞A28

63 / 153

No.

Error symptom

Content

Page

Remarks

21

B. Power error_No power

Check front display LED

A17

22

Check power input Voltage & ST-BY 5V

A18

23

Checking method when power is ON

A19

24

POWER BOARD voltage measuring method

A4

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