LG 32LH240H (CHASSIS:LA96A) Service Manual ▷ View online
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TROUBLESHOOTING
1. Power-up boot check
Check stand-by Voltage.
P700 8pin : +5V_ST
Check X100 clock
Check Power connector
and AC S/W on?
OK
No
OK
Check Q706 Output.
12V, 5V
Replace Power board.
Replace X100.
OK
Check Fuse.
OK
No
Check P700 PWR_ON.
2pin : 5V
OK
Re-download software.
No
OK
Check Multi Voltage
P700 13pin : 12V, 18pin : 24V
Replace Power board
No
Replace Mstar(IC100) or Main board
OK
Replace Q706
No
Check inverter control & error
P700 22pin : Low
P700 20pin : high
OK
Check Power board or Module
No
Check Mstar LVDS output
R812, R813,..., R821
Replace Mstar(IC100) or Main board
No
OK
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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)
Check IC1002
(19",22")Check IC1002.
No
Check IF_P/N Signal
OK
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
Bad 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.
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 (#5, #6)
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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