LG 37LH250H Service Manual page 20

6. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage or open conductor.
Check JK1200(*JK1202).
Check Mstar LVDS output
7. HDMI Video
Check input signal format.
Is it supported?
OK
Check HDMI Cable conductors for
damage of open conductor.
OK
Check JK500, 501, 502
OK
Check EDID & EEPROM
IC500, 501, 502.
I2C Signal (#5, #6)
OK
Check HDCP key NVRAM(IC105)
power & I2C Signal (#5, #6)
OK
Check HDMI Signal
OK
Check Mstar LVDS output
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Only for training and service purposes
OK
OK
No
OK
No
No
Replace Jack.
No
Replace the defective IC or re-download
EDID data.
No
Replace the defective IC.
No
Check other set.
If no problem, check signal line.
No
Replace Mstar(IC100) or Main board.
Replace Jack.
Replace Mstar(IC100) or Main board.
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No
Replace Main board.
LGE Internal Use Only