LG 37LH40 / 37LH41 (CHASSIS:LA92G) Service Manual ▷ View online
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C
2009
4. Component Video
Check input signal format.
Is it supported?
OK
Check Component Cable.
OK
Check JK1206
NO
Replace Jack.
OK
NO
Replace Mstar(IC100)
or Main board
OK
Check FRC IC
NO
Replace Mstar(IC1100)
or Main board
1) FRC clock(X1100)
2) 3.3V, 1.8V, 1.26V
2) 3.3V, 1.8V, 1.26V
3) I2C signal (R1106,R1107)
Check Mstar LVDS output
R1109, R1110, R1111,…R1120
5. RGB Video
Check input signal format.
Is it supported?
OK
Check RGB Cable connectors for
damage.
OK
Check JK1201
NO
Replace Jack.
OK
Check EDID
NO
Re-download EDID data.
OK
Check signal R/G/B/H/V-Sync
R127/128/129/146/149
NO
Check other set
If no problem, check signal line
OK
NO
Replace Mstar(IC100)
or Main board
Check Mstar LVDS output
R1109, R1110, R1111,…R1120
Replace the defective IC or
OK
Check FRC IC
NO
Replace Mstar(IC1100)
or Main board
1) FRC clock(X1100)
2) 3.3V, 1.8V, 1.26V
2) 3.3V, 1.8V, 1.26V
3) I2C signal (R1106,R1107)
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2009
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6. AV Video
Check input signal format.
Is it supported?
OK
Check AV Cable for damage or
open connector.
OK
Check JK1206(*JK1202)
NO
Replace Jack.
OK
NO
Replace Mstar(IC100)
or Main board
OK
Check FRC IC
NO
Replace Mstar(IC1100)
or Main board
1) FRC clock(X1100)
2) 3.3V, 1.8V, 1.26V
2) 3.3V, 1.8V, 1.26V
3)I2C signal (R1106,R1107)
Check Mstar LVDS output
R1109, R1110, R1111,…R1120
C
2009
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7. HDMI Video
Check input signal format.
Is it supported?
OK
Check HDMI Cable for damage or
open connector.
OK
Check JK500,501,502,503(Side)
NO
Replace Jack.
OK
Check EDID
NO
Re-download
EDID data.
OK
Check HDCP key NVRAM(IC105)
power & I2C Signal (pin 5, 6)
NO
Replace the defective IC.
OK
Check HDMI S/W (IC502)
NO
Replace HDMI
Switch (IC502)
Switch (IC502)
NO
Replace Main board
OK
NO
Replace Mstar(IC100)
or Main board
OK
Check FRC IC
NO
Replace Mstar(IC1100)
or Main board
1) FRC clock(X1100)
2) 3.3V, 1.8V, 1.26V
2) 3.3V, 1.8V, 1.26V
3) I2C signal (R1106,R1107)
Check Mstar LVDS output
R1109, R1110, R1111,…R1120
1) 3.3V_HDMI Voltage (R544)
2) HDMI I2C Signal (R2102, R2103)
2) HDMI I2C Signal (R2102, R2103)
3) HDMI Switch out signal (R142, R143)
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C
2009
8. All Source Audio
Make sure you
can’t hear any audio.
OK
First check the TV SPEAKER Menu
(Menu > Sound > TV Speaker)
NO
Toggle the menu
OK
Check Mstar
AUDIO_MASTER_CLK
R603
NO
Replace Mstar(IC100)
or Main board
OK
Check Mstar I2S Output
R604, R605, R606
NO
Check signal line
Or replace IC100
Or replace IC100
OK
Check IC600 Power
*20V, 3.3V, 1.8V.
NO
Check Regulaor
IC601,IC704
OK
Check Output Signal
P600 1,2,3,4 PIN
NO
Replace NTP(Audio AMP)
IC600
OK
Check Connector & P600
NO
Replace connector
if found to be damaged.
OK
Check speaker resistance
and connector damage.
NO
Replace speaker.
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