LG 22LU7000 (CHASSIS:LU7000) Service Manual ▷ View online
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5. In case of no sound
(1) Symptom
1) LED
is
blue.
2) Screen display but sound is not output
(2) In case of no sound to speaker
All input mode
is no sound?
Yes
Is VCC “+12V”
(JP1:1pin) and L5 normal?
No
No
Replace Power
Board& U2(FET)
Board& U2(FET)
Yes
Is the speaker
on it Audio
menu?
on it Audio
menu?
No
Check the
Speaker Cable
Speaker Cable
Only HDMI is
no sound?
Download
the EDID data.
No
Only TV is
no sound?
No
Yes
Check the Tuner
In/Out
In/Out
Yes
Only AV/PC input is no
sound?
No
Check the input source.
Yes
Replace Main Board.
Set on speaker
in Audio menu
in Audio menu
Is the Speaker
Cable normal?
Cable normal?
Yes
No
Only Componet/ DVD
input is no sound?
Is the output of U741
normal?
normal?
No
Yes
Yes
U112 operate
normal?
normal?
Replace U112
(FLI10610H)
(FLI10610H)
U761 operate
normal?
normal?
Replace U761
(NTP-3000A)
(NTP-3000A)
No
No
Yes
Yes
Replace Main Board.
No
Replace U714
(CD4052)
(CD4052)
Check the input source &DVD
player.
player.
Yes
Block B
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(3) In case of no sound to Headphone
All input mode
is no sound ?
No
Same as Block B
Yes
Is VCC 3V3 normal?
No
Replace U45(LD1117)
Yes
U112 operate
normal?
Replace U112(FLI10610H)
U764 operate
normal?
Replace U764(TPA6110)
Yes
No
No
Is sound output of the
JP762 normal?
Yes
Replace JP762
Replace MainBoard
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6. Exterior view defectiveness
(1) Check follow
Damage LCD module?
Replace LCD Module
No
Damage cabinet?
No
Yes
Yes
Replace cabinet
Yes
Damage RCU?
Replace RCU.
No
Replace stand
Scratch Stand?
Yes
Damage DVD Player?
No
Replace DVD Player
Yes
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z
DVD Door Open/Close
(1)Symptom
1) Door being not Opened/Closed completely
2) Unbalance Open/Close the door
2) Unbalance Open/Close the door
(2)Check follow
a) AC power off, while door is open.
b) Grab both L/R door with each hands and pull it open.
c) If pulled with hands disregard noises heard while opening by force.
d) Doors are opened till its symmetrical to the center.
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