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Defective CCFL back-light may has the following symptom:
  • Screen flashes on red/pink and goes off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering on and off.
All these symptoms indicate that the LCD Backlight Lamp (CCFL Lamp)
has reached the end of the life and all you need to do is replacing the CCFL Lamp.

 Please note:
  • Dark screen may be caused by "Backlight or Inverter", Inverter is much easier to replace & should always be tested first
  • Replace with "Known Good Inverter" before attempting Backlight Replacement
  • Backlight is Internal part and may result in damage to lcd if not done correctly


Replacement Guide of Notebook LCD Screen Backlight


How to replace Laptop LCD Back-light or CC FL (cold-cathode flourescent lamp)


Warning:  It is a must that power is removed from
inverter to avoid electric shock. High voltage of up to
1KV is required to power the CC FL back-light




Step 1: place LCD face on top of a clean flat mat on the the table or work area


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Step 2: remove connector from inverter and remove tape that hold the wires and inverter to the base of frame.


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Step 3:remove additional tape

 

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Step 4: Remove Inverter Board from cradle


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Step 5: remove aluminum tape and screws from LCD brackets

 

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Step 6: perform step#5 on the other side

 

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Step 7: remove metal from lower-section of LCD

 

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Step 8: remove lock that fasten wires to the assembly

 

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Step 9: loosen the wires from assembly

 

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Step 10: carefully remove CCFL Bulb w/ cradle assembly

 

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Step 11: unsolder connection from both terminals and replace bulb

Step 12: Retrace back until all screws are fastened to the LCD brackets. At this time you have to test if LCD is properly connected by inserting power plug in the DC power jack and power up the machine. As soon as you get the proper video display then power down the machine and replace the LCD frame.


 
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