LG 32CL20-UA (CHASSIS:LA92A) Service Manual ▷ View online
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2. Digital TV Video
Check RF cable & Signal.
Check Tuner 5V Power
IC1001 4pin
OK
OK
Check Check Demodulator Input
Clock(X1005-25MHz)
Check IC1002.
Check IC1005(19”, 22”).
No
Check IF_P/N Signal
OK
Bad Tuner. Replace Tuner.
No
Replace X1005.
No
OK
Check Mstar LVDS output
R812, R813,..., R821
Check IC1004(LGDT) Output
- AR1070, AR1071
OK
Replace IC1004.
No
Replace Mstar(IC100) or Main board.
No
3. Analog TV Video
Check RF cable.
Check Tuner 5V Power.
IC1001 4pin
OK
Check CVBS signal.
TU1001 #19 Pin
Check IC1002.
Check IC1005(19”, 22”)
No
OK
Replace Tuner.
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
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4. Component Video
Check Component Cable.
Check JK1200.
OK
Check input signal format.
Is it supported?
OK
Replace Jack.
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
5. RGB Video
Check RGB Cable conductors for
damage.
Check JK1204.
OK
OK
Check input signal format.
Is it supported?
OK
Check signal R/G/B/H/V-Sync
C113, C108, C114, R146, R149
Replace Jack.
No
Check EDID.
OK
Replace the defective IC or re-download EDID data
No
Check other set.
If no problem, check signal line.
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
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6. AV Video
Check AV Cable for damage or open conductor.
Check JK1200(*JK1202).
OK
Check input signal format.
Is it supported?
OK
Replace Jack.
*JK1202 is Side AV supported model
32/37/42/47LH30 Models
No
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
Check HDMI Cable conductors for
damage of open conductor.
Check JK500, 501, 502
OK
OK
Check input signal format.
Is it supported?
OK
Check EDID & EEPROM
IC500, 501, 502.
I2C Signal
Replace Jack.
No
Replace the defective IC or re-download
EDID data.
No
Check HDCP key NVRAM(IC105)
power & I2C Signal (#5, #6)
Replace the defective IC.
No
OK
Check HDMI Signal
Check other set.
If no problem, check signal line.
No
Replace Main board.
No
OK
7. HDMI Video
OK
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
No
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8. All Source Audio
Check Mstar I2S Output
R604, R605, R606
Check IC600 Power
*20V, 3.3V, 1.8V.
OK
OK
Make sure you can’t hear any audio.
OK
First check the TV SPEAKER Menu
(Menu > Sound > TV Speaker)
Toggle the menu.
OK
Check Mstar AUDIO_MASTER_CLK
R603
OK
Check Connector & P600
Check Regulator IC601, IC704
No
Check signal line. Or replace IC100.
No
Replace Mstar(IC100) or Main board.
No
No
Check Output Signal P600 1, 2, 3, 4 pin.
OK
Replace NTP(Audio AMP)
IC500.
No
Replace connector if found to be damaged.
No
OK
Check speaker resistance
and connector damage.
Replace speaker.
No
*20V Voltage is dependent on model.
32/36LH20, 32LH30 => 24V
19/22LH20 => 15V(pin1 or 2)
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