Trouble Shooting - LG 55LH80YD-AB Service Manual

Trouble shooting

WIRELESS MODEL
a
Analog
INPUT
Digital
AV
Component
HDMI
RGB
Defect block Symptoms
a Bad (noise) image / No image
- osd is good
Bad sound / No sound
b Bad image
- IC's cold soldering or memory defect accompanied noise on osd
Bad sound / No sound
Wireless connecting osd is displayed continually
- There is no video signal from Rx module to TV main ic, so TV
understand this time like disconnection state and display
connecting
osd continually. And then, if TV is not activated rightly within
15min,
it will go to st-by mode.
C Bad image / Bad or No sound
Wireless connecting osd is displayed continually
- No image
＊Focused on Wireless connection
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Only for training and service purposes
OSD
b c
LVDS
SIGNAL
MAIN IC
CONVERTER
LGE3159 DTC30LM36 +
SIL9134
MEDIA-BOX
d
Wireless
HDMI
TX MODULE
SIL9125 + SB9111 +
SB9120 + SB9121 +
SB9110 SIL9134
Wired
Service
only
HDMI CABLE
HDMI JACK
Wireless connection
No effect directly
No effect directly
No effect directly
No connection
No effect directly
No connection
WIRELESS LH80
OSD
e f
HDMI
RX MODULE MAIN IC
LGE3369 +
LGE7329
TV SET
HDMI5
HDMI JACK
Check
▶ Check the EDID of HDMI & RGB
▶ Check cable & contact error
▶ Check main ic basic power & power
sequence
▶ Control line check (I2C & etc)
▶ Check input/output video & audio
signal
▶ Check power & control line
▶ Check input/output signal
▶ Check inner HDMI cable connection
status
(There can be cable's defect.)
g
LVDS
LCD
MODULE
LGD V4
LGE Internal Use Only