Troubleshooting – LG TCON Boards - LC420WUN-SAA1 (6870C-4200C) -
LC420WX5-SLA1 (6870C-0113A) - LC420WX7 (6870C-0150B) - LC470WU4-SLA1
(6870C-0120C) - LC520WU1-SLA1 (6870C-0152A)
A) LC420WUN-SAA1 (6870C-4200C)
LCD Panel Model: 42 inches HD Panel
Vcc input= 12V
1) PGAMMA: BUF22821.
If this IC failed, it will cause No Display or Missing Colors.
2) U35= CY25560.
If this IC failed, it will cause No Display.
3) UC1= TL2412MC.
If this IC failed, it will cause No Display or Display Distortion problem.
4) U5= TPS65162 power management IC.
If this IC failed, it will cause No Display.
B) LC420WX5-SLA1 (6870C-0113A)
LCD Panel Model: 42 inches Panel
Vcc input= 12V
1) U7= TPS65161 is a power management IC.
If this IC failed, it will cause No Display.
2) U5 is a SDRAM memory IC.
If this IC failed, it will cause No Display or Display Distortion problem.
3) UC1= R8A0102SFP.
If this IC failed, it will cause No Display or Rainbow Display problem.
4) U4 is an EEPROM IC.
If this IC failed, it will cause No Display or White Screen problem.
C) LC420WX7 (6870C-0150B)
LCD Panel Model: 42 inches Panel
Vcc input=12V
1) U7= TPS65162 is a power management IC.
If this IC failed, it will cause No Display.
2) U5 is a SDRAM memory IC.
If this IC failed, it will cause No Display or White Screen problem.
3) UC1= R8A01028AFP.
If this IC failed, it will cause No Display, White Screen or Rainbow Display problem.
D) LC470WU4-SLA1 (6870C-0120C)
LCD Panel Model: 47 inches Panel
Vcc input= 12V
1) U401 SDRAM.
If this IC failed, it will cause No Display or Display Distortion problem.
2) UC101= R8A00014BF.
If this IC failed, it will cause No Display or White Screen problem.
3) U101 EERPOM memory IC.
If this IC failed, it will cause No Display.
4) U202= TPS65161 power management IC.
If this IC failed, it will cause No Display.
E) LC520WU1-SLA1 (6870C-0152A)
LCD Panel Model: 52 inches Panel
Vcc input= 12V
1) PWM1= TPS65161 power management IC (DC-DC circuit IC).
If this IC failed, it will cause No Display.
2) UC8= EP2C35F484C7N.
If this IC failed, it will cause No Displayor Display Distortion problem.
3) OSC1= 50MHz crystal.
If this component failed, it will cause No Display or Rainbow Display on the screen.
4) SDRAM1 is a SDRAM memory IC.
If this IC failed, it will cause No Display or Rainbow Display problem.