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.
- 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
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
Step 2: remove connector from inverter and remove tape that hold the wires and inverter to the base of frame.
Step 3:remove additional tape
Step 4: Remove Inverter Board from cradle
Step 5: remove aluminum tape and screws
from
LCD
brackets
Step 6: perform step#5 on the other side
Step 7: remove metal from lower-section of LCD
Step 8: remove lock that fasten wires to the assembly
Step 9: loosen the wires from assembly
Step 10: carefully remove CCFL Bulb w/ cradle assembly
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.
