Monday, February 02, 2015

LG 32LCR TROUBLE SHOOTING - NO POWER - NO PICTURE - NO SOUND

TROUBLE SHOOTING

No power

Symptom

1) Front LED is No light

2) The Set doesn’t discharge little

 Check process

Is plug in power cord?
NO
Plug in a power cord
YES

Check P200 Voltage (P-ST_5V)?
NO
Check the PSU
YES

Check X-tal X600 (19.6608MHz)
NO
Check X-tal X600
YES

Check IC600 Voltage (3.3V)
NO
Check IC600
YES

Check Power on/off (5V)
NO
Check Q901
YES

Exchange the PSU

 No picture

Symptom

1) Some mode doesn’t display.

2) Front LED is green

3) The set still discharge a little

Check follow

1) RF-mode doesn't display

Is the LVDS cable
connected?
YES
Is the Tuner cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Are input voltage, I2C,
and CVBS output
good in Tuner?
YES
Is VCT-P IC good?
NO

NO

NO

NO

NO
Insert the LVDS
cable exactly

Insert the Tuner
cable exactly

If it dead or short,
exchange this
elements

Exchange the Tuner

Exchange the VCTP IC


2) AV/Component-mode doesn’t display

Is the LVDS cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Is VCT-P IC good?
NO

NO

NO
Insert the LVDS
cable exactly

If it dead or short,
exchange this
elements

Exchange the VCTP IC

3) RGB/HDMI-mode doesn't display

Is the LVDS cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Check the EDID
data
YES
Is AD9381 good?
(only _ HDMI)
YES
Is VCT-P IC good?
NO

NO

NO

NO

NO
Insert the LVDS
cable exactly

If it dead or short,
exchange this
elements

Download the EDID
data

Exchange AD9381
IC

Exchange the VCTP IC


No Sound

Symptom

1) Front LED is Green

2) The Set display a screen, but a sound doesn’t output

Check follow

1) Speaker part

Are Speaker Cables
Good?
YES
Are Speaker Cables
connect normally?
YES
Are Speaker units
good?
NO

NO

NO
Exchange the cable

Insert the cable
exactly

Exchange the
Speaker unit

2) Main board part

Is sound at HDMI
Good?
YES
Is EDID download
good?
YES
Is IC401 good?
(AD9381)


NO

NO


Download EDID
data once more

Exchange IC401

Is sound at
Scart1/2 (or
Component2)RGB,
or Side AV Good?
YES
Are good some
elements (C, R, L,
or Diode) at Sound
path
YES
Is IC800 good?
(Switching IC)
YES
Is IC601 good?
(VCT-P)
YES
Is IC801 good?
(Amplifier)


NO

NO

NO

NO


If it dead or short,
exchange this
elements

Exchange IC800

Exchange IC601

Exchange IC801