Power Supply Connector P203 Voltage And Diode Check - LG 32LD350 Troubleshooting Manual

Power Supply Connector P203 Voltage and Diode Check

Power Supply Connector P203 Voltage and Diode Check
P203 "SMPS" to CN1 "Ballast"
Pin
1-5
6-10 6 10
(1)
11
(2)
12
(3)
13
(4)
14
(1) Error Pin 11 (To P201 pin 20 Silk Screened A-DIM) Goes high when the backlights are told to come on. Goes
back low when they come on. If it goes high again on the 5th attempt to fire the backlights, the set shuts off.
(2) INV_ON Pin 12 (From P201 pin 18) Turns on the Backlights.
(3) A-DIM Pin 13 (From P201 pin 22 Silk Screened PWM-DIM) Is not used.
(4) PWM-DIM Pin 14 (From P201 pin 24 Silk Screened Error_Out) can vary according to incoming video IRE level
and OSD Backlight setting Output from the Video Processor IC100. Range 0.65V to 3.25V.
Diode Mode values taken with all Connectors Removed
Label STBY
24V 0V
GND GND Gnd Gnd
ERROR 0V
INV_ON 0V
A-DIM n/c
P-DIM 0V
Run Diode Check
24.19V 0.73V
Gnd Gnd Gnd Gnd
0.59V Open
3.31V Open
4.5V Open
0.65V~3.25V Open
38
P203
November LCD TV 32LD350
1