LG 32LF15R (CHASSIS:LP81A) Service Manual ▷ View online
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TROUBLESHOOTING
AV in
Comp in
RGB in
(D/L)
AV out
CVBS IN
LINE OUT
LINE IN
LINE_MUTE
RF
(Tuner)
DISPLAY MODULE
HDMI
TMDS351PAG
HDMI MUX
DDR MEM
SERIAL
FLASH
Mstar
Romeo
LGE6891CD
NTP3000A
Digital
Audio AMP
MAIN NVM
MC74HC4066
Audio SW
LM324
X4 AMP
EDID NVM
DDC/HDP/CEC
TMDS(HDMI in)
PART_I2C
SW_RESET
I2S OUT
LVDS
TMDS(HDMI in)
DDC/HPD
[HDMI MUX, direct JACK to MAIN IC]
DDC
AUDIO_SW
LINE IN
LINE IN
Y/Pb/Pr IN
DSUB_DDC
x0.55
LINE_MUTE
LINE OUT
CVBS OUT
x4
x0.55
LINE IN
CVBS IN
SIF IN
TUNER_I2C
PART_I2C
HDMI_SEL
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1. No power
(1) Symptom
1) It is not discharged minutely from module.
2) Light does not come into the front LED.
2) Light does not come into the front LED.
(2) Check process
Plug in the power cord.
No
Yes
Is the power cord
plugged in?
plugged in?
Connect the cable to SC100
No
Yes
Are the line filter and
PSU connected?
PSU connected?
Replace the fuse.
No
Yes
Is the fuse of PSU
normal? (F101)
Connect a cable P1100.
After all cables connect is removed to PSU, the
AC voltage marking is authorized on manual.
When ST-BY 5V is not operated. replace PSU.
AC voltage marking is authorized on manual.
When ST-BY 5V is not operated. replace PSU.
No
Yes
Is it connected
that PSU and P1100
in Main B/D?
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2. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green.
2) It maintains the condition where the front LED is green.
(2) Check process
3. Unusual display from RF mode
Check the LCD Module
Replace the
Power board.
Power board.
Does
minute discharge
at Module?
Is the inverter
/ VaVs on?
Is output the normality
Low/High voltage except
Stand-by 5V?
Low/High voltage except
Stand-by 5V?
Yes
No
No
Is the link cable
normal?
Yes
Is the IC801’s
output normal?
Reconnect Panel line cable.
(HD : P403)
(HD : P403)
No
Replace the VSC.
No
Yes
Check the power.
Is
video output of the
Tuner normal? (Check
TU500_Pin13)
Is the
input voltage
normal?(Check
Pin3)
Is the I2C communication normal?
(Check Pin9, Pin10)
(Check Pin9, Pin10)
Yes
No
Yes
Is the LVDS
Cable connected?
well
Yes
Change the IC(IC801)
Cable inserts well.
No
No
Check the Tuner.
No
Block A
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4. Unusual display from rear AV mode.
Yes
Is video input of
the A/V Jack normal?
(Check R8044)
Check the input source.
Same as Block A.
No
5. Unusual display from component 2 model
Yes
Is video
input of the Component
Jack normal? (Check
R8030/32/33)
Check the input source.
Change IC801.
No
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