LG 32HIZ20 (CHASSIS:LP61D) Service Manual ▷ View online
- 13 -
TROUBLESHOOTING
1. No power
(1) Symptom
1) Front LED is No light
2) The Set doesnt discharge little
2) The Set doesnt discharge little
(2) Check process
Is plug in power cord?
Plug in a power cord
No
Check the PSU
No
Check X-tal X600
No
Check IC600
No
Check Q901
No
Yes
Check P200 Voltage (P-ST_5V)?
Yes
Check X-tal X600 (19.6608MHz)
Yes
Check IC600 Voltage (3.3V)
Yes
Check Power on/off (5V)
Yes
Exchange the PSU
- 14 -
2. No picture
(1) Symptom
1) Some mode doesnt display.
2) Front LED is green
3) The set still discharge a little
2) Front LED is green
3) The set still discharge a little
(2) Check following
1) RF-mode doesnt display
Is the LVDS cable
connected?
connected?
No
Yes
Is the Tuner cable
connected?
connected?
No
Yes
Are good some
elements(C, R, L, or
Diode) at path?
elements(C, R, L, or
Diode) at path?
No
Yes
Are input voltage, I2C,
and CVBS output
good in Tuner?
and CVBS output
good in Tuner?
No
Is VCT-P IC good?
Insert the LVDS
cable exactly
cable exactly
Insert the Tuner
cable exactly
cable exactly
If it dead or short,
exchange this
elements
exchange this
elements
Is the LVDS cable
connected?
connected?
No
Yes
Are good some
elements(C, R, L, or
Diode) at path?
elements(C, R, L, or
Diode) at path?
No
Yes
Is VCT-P IC good?
No
Insert the LVDS
cable exactly
cable exactly
If it dead or short,
exchange this
elements
exchange this
elements
Exchange the VCT-
P IC
P IC
Exchange the Tuner
Exchange the VCT-
P IC
P IC
No
Yes
Is the LVDS cable
connected?
connected?
No
Yes
Are good some
elements(C, R, L, or
Diode) at path?
elements(C, R, L, or
Diode) at path?
No
Yes
Check the EDID
data
data
No
Yes
Is AD9381 good?
(only _ HDMI)
(only _ HDMI)
No
Is VCT-P IC good?
Insert the LVDS
cable exactly
cable exactly
If it dead or short,
exchange this
elements
exchange this
elements
Download the EDID
data
data
Exchange AD9381
IC
IC
Exchange the VCT-
P IC
P IC
No
Yes
2) AV/Component-mode doesnt display
3) RGB/HDMI-mode doesnt display
- 15 -
3. No Sound
(1) Symptom
1) Front LED is Green
2) The Set display a screen, but a sound doesnt output
2) The Set display a screen, but a sound doesnt output
(2) Check following
1) Speaker part
Are Speaker Cables
Good?
Good?
Are Speaker Cables
connect normally?
connect normally?
No
Yes
No
Yes
Are Speaker units
good?
good?
No
Exchange the cable
Insert the cable
exactly
exactly
Exchange the
Speaker unit
Speaker unit
Is sound at HDMI
Good?
Is EDID download
good?
good?
No
Yes
Is IC401 good?
(AD9381)
(AD9381)
No
No
Download EDID
data once more.
data once more.
Exchange IC401
Is sound at
Scart1/2 (or
Component2)RGB,
or Side AV Good?
Component2)RGB,
or Side AV Good?
Are good some
elements (C, R, L,
or Diode) at Sound
path?
elements (C, R, L,
or Diode) at Sound
path?
No
No
Yes
Yes
Is IC800 good?
(Switching IC)
(Switching IC)
No
If it dead or short,
exchange this
elements
exchange this
elements
Is sound at RF, AV,
or Component1
Good?
Good?
Are good some
elements (C, R, L,
or Diode) at Sound
path?
elements (C, R, L,
or Diode) at Sound
path?
No
Yes
No
If it dead or short,
exchange this
elements
exchange this
elements
Exchange IC800
Is IC601 good?
(VCT-P)
(VCT-P)
No
Exchange IC601
Yes Is IC801 good?
(Amplifier)
No
Exchange IC801
2) Main board part
4. No clock
(1) Symptom
Clock doesn’t display.
(2) Check following
- Cloc part
- 16 -
Is the cable
connected?
connected?
Check P100 voltage.
(ST-BY_5V)
No
No
Yes
Check the 12C.
No
Insert the cable
exactly.
Check the PSU.
Exchange the clock
ass’y.
Is VCT-P IC good?
No
Exchange the VCT-
P IC.
P IC.
Yes
Yes
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