LG 37LD340H / 37LD345H (CHASSIS:LA06G) Service Manual ▷ View online
Check JK3100
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK3100 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at C227 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C227 because it’s more easy to check.
Can you see the normal waveform?
YES
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
AV Video Trouble shooting guide
YES
Check input signal format.
Is it supported?
Is it supported?
YES
Check AC cable for damage
For damage or open conductor
For damage or open conductor
YES
Component Video Trouble shooting guide
Check JK3100
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK3100 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at C213 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C213 because it’s more easy to check.
Can you see the normal waveform?
YES
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
YES
Check input signal format.
Is it supported?
Is it supported?
YES
Check AC cable for damage
For damage or open conductor
For damage or open conductor
YES
HDMI Video Trouble shooting guide
Check JK801/JK802
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK801/JK802 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at R4024, R4025
because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at R4024, R4025
because it’s more easy to check.
Can you see the normal waveform?
YES
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
YES
Check input signal format.
Is it supported?
Is it supported?
YES
Check AC cable for damage
For damage or open conductor
For damage or open conductor
YES
Check EDID & EEPROM
IC801/IC802 I2C signal
R876, R875/ R878,R877(SDA,SCL)
NO
Replace the defective IC or re-download EDID data
YES
YES
Check HDCP key NVRAM(IC103)
Power & I2C signal
Power & I2C signal
NO
Replace the defective IC
RGB-PC Video Trouble shooting guide
Check P1103
Can you see the normal waveform?
Can you see the normal waveform?
NO
P1103 may have problem. Replace this Jack.
Check the input of Mstar(IC101).
Measure waveform at R4024, R4025
because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at R4024, R4025
because it’s more easy to check.
Can you see the normal waveform?
YES
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
YES
Check input signal format.
Is it supported?
Is it supported?
YES
Check AC cable for damage
For damage or open conductor
For damage or open conductor
YES
Check EDID & EEPROM
IC1105 I2C signal
R1141, R1143(SDA,SCL)
NO
Replace the defective IC or re-download EDID data
YES
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