LCD DV
32LH30
29
Spring 2009
Continue if the 1
st
test was successful. Leave original 10K resistor in
place.
(3) Add another 10K resistor between (5V) pin 7, 8, 9 or 10 and
Pin 20 (INV On).
(4) Apply AC Power. This simulates a Power On and Backlight On command.
Backlights Normal:
a) If normal, the backlights should turn on.
Backlights Abnormal:
b) Recheck connector P203 and confirm 24V on pins 1~5.
1) If low or missing, use diode mode to check the 24V line on Ballast
connector CN1. If low, this indicates a shorted output FET).
2) If open, check the Ballast Fuse, possible Open.
c) Confirm the INV On/Off line P203 Pin 10 is going to 3V.
REMOVE AC POWER:
d) Check the connections to the Backlights. DO NOT check these when AC
is applied as they carry 1.2Kv each.
TEST 2 Power Supply PWB Backlights Test
TEST 2 Power Supply PWB Backlights Test
P700 Connector disconnected from the Main PWB.
Apply AC after adding jumper.
Use P700
Side to insert
resistors
