Doc No.
Version 1.0
TITLE
Service Manual
LCD TV For 232-S12
Page 8/44
4-3 LED is Malfunctioning、Keypad Problem
LED is not working
LED is Malfunctioning
Replace System
board if there is no
voltage
Replace board if
there is no voltage
Secure connection or
replace cable
LED flashes
Check Power supply Con.
CN904-pin7 to ground =5V
Replace Power
Supply if there is no
voltage
Fail
Fail
Fail
OK
OK
OK
Keypad doesn’t work
Replace Cable
Secure connection
Fail
Test
Finish
Trouble Condition Check Item Replace Material Test
Step1：
Check connector CN 1 on
System board to CN1 located
on Keypad board for a loose
connection
Step2：
Check connector CN 1 on
System board to CN1 located
on Keypad board for a broken
cable
Step2：
Check Keypad board
D1 & CN1-pin 1 to
ground = 5V
Step1：
Check CN 1 on system
board to CN 1 on Keypad
board for a loose
connection or bad cable
Step3：
Check System board
CN1-pin1 to ground =
5V
Fail
Fail
Note: Before
proceeding confirm
that Power cable is
connected and that
proper voltage is
being fed to TV.
(Check power
switch located next
to power input and
confirm that it’s
ON.)
Step 3：
Replace Keypad Board
OK
Step 4：
Replace System Board
Fail
To Next Page
Loading...
Need help?
General
