19LV2500-UA (CHASSIS:LA01T) - LG TV Service Manual (repair manual). Page 40

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1. Power-up boot check
Check X1002 clock
32.76 KHz
Replace X1002
Replace Q7506
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
ok
ok
ok
ok
ok
ok
ok
No
No
No
No
Check X201 Clock
24 MHz
Replace X201
ok
No
Check Adater power.
JK7500 : 24V 
Replace Adapter
No
Check Micom Voltage
IC1002  pin 48 : +3.5V_ST
Replace IC7503
Check IC1002 PIN 36(RL_ON).
RL_ON : 3.3V
Replace Micom(IC1002) or Main board
Re-download 
Micom software.
No
No
Check IC7502/6/7, IC403/7 Output Voltage
IC7502 : 12V
IC7506 : 3.3V
IC7507 : 5.0V
IC403 : 1.26V
IC407 : 1.5V
No
Replace IC7502/6/7, IC403/7
Check LVDS Power Voltage
Q7506 : 12v(26”)
Change Module
ok
No
Check Inverter Control & Error Out
P7501 11 pin : Low
P7501 12 pin : High
Check  Module

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