51
Chapter 3
Symptoms
Can Not Power on
Check Power code
Power code
Plug in?
Replace Power board or Main board
Or IO board or All cable
/
LED Bright?
Replacement Panel
A
Replacement M/B
END
no
LED Bright
Green color ?
Check Remote control
and keypad ?
OK
Replacement Remote control or
IR board or Keypad board
NG
Replacement Cable
Check M/B
no
no
no
LCD Panel
can Display ?
no
Check panel’s
all cable
Replacement M/B
Check Power code
Power code
Plug in?
Replace Power board or Main board
Or IO board or All cable
/
LED Bright?
Replacement Panel
A
Replacement M/B
END
no
LED Bright
Green color ?
Check Remote control
and keypad ?
OK
Replacement Remote control or
IR board or Keypad board
NG
Replacement Cable
Check M/B
no
no
no
LCD Panel
can Display ?
no
Check panel’s
all cable
Replacement M/B
Check Power code
Power code
Plug in?
Replace Power board or Main board
Or IO board or All cable
/
LED Bright?
Replacement Panel
A
Replacement M/B
END
no
LED Bright
Green color ?
Check Remote control
and keypad ?
OK
Replacement Remote control or
IR board or Keypad board
NG
Replacement Cable
Check M/B
no
no
no
LCD Panel
can Display ?
no
Check panel’s
all cable
Replacement M/B
Summary of Contents for AT4220A
Page 10: ...4 Chapter 1 LCD Main Board Block Diagram ...
Page 25: ...Chapter 1 19 For AT4220B Y Yellow Red White Blue Green R W 6 YLGHR 6 ...
Page 28: ...22 Chapter 1 For AT4220B For AT4220 ...
Page 47: ...Chapter 2 41 8 Release all the screws marked in red Then lift the TV back cover as shown ...
Page 56: ...50 Chapter 2 ...