Having problems with your Compaq Presario 700 470024-192 Notebook ?

How to replace backlight on compaq presario f700


Answers :

There is much more to gaining access to the inside of the LCD screen than removing a few screws. You MUST remove the battery, remove the silver screws that are NOT indicated with the keyboard icon. Then remove the 2 screws on the bottom of the laptop near the corners that are closest to the hinges for the LCD. Then carefully remove the power button panel that stretches across the top of the keyboard. Under this panel, on the left side, you will see a connector with a black pull tab on it. This is the LCD data cable connection. Pull it straight out, lifting it up not side to side. On the power button board, you should see a screw, remove it then disconnect the LCD microphone cable located on the left side of the power button board. Locate the hinges on either side of the bottom half of the laptop, remove the 4 black screws. The LCD should be free to detach from the base of the system. The black and white wires going into the right side of the LCD assembly are for the wireless card antennas and need not be removed. Now you can remove the rubber feet going across the top of the LCD, the 2 rubber covers on the raised lower middle section, as well as the 2 plastic covers in the lower corner of the LCD assembly. These can be easily replaced. Use a small flathead screwdriver to remove them. Now remove the exposed screws. Separating the 2 halves of the LCD outer case requires a small flathead screwdriver. Start at one corner and pop it open. As you work around either side, you do NOT just pull it open. Doing this will break the locking tabs that hold it together. Use the flathead to gently push inward at the center of each tab, this will release them without damaging them. Once inside, remove the remaining hinge screws at the bottom sides of the LCD (silver screws). Then remove all remaining screws at the top of the LCD panel which fasten the panel to the back half of the LCD assembly. Lift the panel up from the top as if you were closing the computer lid. disconnect the LCD data cable then lay the panel back down again. Disconnect the pink and white wires from the LCD inverter at the center bottom of the panel, you may have to remove the inverter to do this. Also disconnect the inverter from the LCD cable. the LCD is now free to be removed from its housing. Gaining access to the CCFL (LCD backlight) requires you to remove any screws that may be holding the panel together as well as removing any tape around the edges. This is where the above post is WRONG. The bulb is NOT held in by tape alone. You will have to completely disassemble the LCD panel by seperating the glass panel from the rest of the layers. BE VERY CAREFUL NOT TO SEPARATE THE LAYERS. If you do, your screen will be depolarized and images will be distorted or discolored. You will have to then have it re-polarized. The bulb is encased in the plastic trim that holds the LCD layers together. It is located at the bottom of the screen. Once you gain access to the bulb, you may carefully remove it. If your planning on replacing the bulb, you can try to get the manufacturer to sell you a replacement but chances are they won't. Go to www.ccfldirect.com and order one. Keep your old one for a reference as you will need the measurements.
If this is what I think it is it is not very difficult to replace but maybe more of a problem to acquire and may not actually be the light. You will have to disassemble the machine to a point that you can get to the connecting wires for the LCD/CRT. On the Screen side of the computer there are 2 to 5 screws under little rubber cushions or what appear to be stickers depending on what Compaq did with that model. Once those are removed you can remove the front cover ring and you will see a foil strip at the base of the Screen. Under that foil is the backlight. It is a long thin light that resembles a scanner light. Follow the wires to the mother board connection and disconnect it from the mother board. I have never found any retaining items here except the the tape itself but some models do have them so be careful. Once you have disconnected the wires and removed teh tape carefully lift the element out and reverse the process to install the new one. Before you re-assemble the system connect enough of the items or lose fit them enough that you can power the system on to ensure everyting works. Good luck.
Repair Help & Product Troubleshooting for Compaq Presario 700 470024-192 Notebook

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