2. defective leptop’s inverter board
3. no video output going to the Layar LCD Screen
It is not an easy job repairing leptops specially if we don’t have parts that we can use to replace to the parts we are suspecting to be the culprit. So now, we will going to try to make our own tools for ujiting a bad CCFL backlight of a leptop.
Tools Needed For this Project:
1. a 9volts battery
2. a 9v battery connector
3. a known good CCFL inverter from any leptop or Layar LCD monitor.
Once kau have the tools that we needed, we can continue to the next procedure.
About The Video Output:
If the leptop is equipped with an external monitor connector, we can easily check if the duduk perkara of having a black screen is caused by a faulty video card or GPU within the leptop or maybe the duduk perkara resides inside the Layar LCD which is the inverter and CCFL bulb.
VGA Port on a Laptop
There is some model of leptop that requires kau to press a FN key plus a key with a picture of a monitor to switch between the Layar LCD leptop to external monitor.
Then now, if kau get a video on kamur external monitor then kau now know there is a Layar LCD screen, CCFL bulb and inverter board problem. If the external monitor doesn’t get any video at all, then suspect a video (GPU) or video cable problem.
Checking the CCFL Bulb:
On checking whether kamur CCFL bulb if it is still functional, we can use our own known good inverter to ujit the CCFL bulb is still working or in good condition.
Known Good Inverter
Now, with our known good inverter, connect the CCFL bulb. And next, supplies a power to it using our 9v battery. A leptop inverter is usually powered by 12v and up but with our 9v battery, it is just enough to start the circuit of an inverter.
Connect the black probe from our battery source to the yellow wire, which is usually the 12v supply coming from leptop circuits, but to find more accurately the connection of the power source of an inverter, all kau have to do is to find where is the connection of the SMD fuse in the circuit of the inverter. And the black probe to the ground screw hole of the inverter board.If our CCFL bulb lights up like in the picture below, then we now know that our CCFL bulb is good and working and now we can suspect that our inverter board is bad.
Checking Inverter:
Since that our known good inverter have able to light up the Layar LCD Screen, and then connect the inverter of the leptop back to its position. Then we are going to conduct a ujit to it using the procedure we did to our known good inverter. And if it won’t lights up the CCFL bulb, then we can suspect that our inverter is defective and needs to be replaced to a new one or simply kau can check it if the fuse is open. If it is open, try to make a jumper through the fuse using a thin wire to serves as our fuse, then redo the ujiting again with same procedure as we use on our known good inverter.
Checking the Power Supply Line:
If our known good inverter light up our CCFL bulb and the Laptop’s inverter also lights up using the 9v battery as its power source, then we are going to suspect the 12 volts power supply line from the leptop’s motherbord.
Let us get our multiujiter/multimeter and set it to DC Volts.
Plugged our AC Adapter and turn on our Laptop.
Put the black probe to the ground screw hole on the motherbord and the red probe to the yellow or the supply line and see if kau have a voltage reading on that connection.
If kau are can’t read any voltages from the connector then let us suspect a duduk perkara on the motherbord itself and this needs a lot of knowlayar ledge and experience on repairing Laptop.
At this point, we will have to bring the unit to a technician who have the knowlayar ledge of repairing a complicated duduk perkara of a Laptop.
source: repairguidecollection.info
http://ronelex.com/easy-ujiting-leptop-backlightccfl-inverter/146/
Sumber http://ilmuserviskomputer.blogspot.com/
Checking Inverter:Since that our known good inverter have able to light up the Layar LCD Screen, and then connect the inverter of the leptop back to its position. Then we are going to conduct a ujit to it using the procedure we did to our known good inverter. And if it won’t lights up the CCFL bulb, then we can suspect that our inverter is defective and needs to be replaced to a new one or simply kau can check it if the fuse is open. If it is open, try to make a jumper through the fuse using a thin wire to serves as our fuse, then redo the ujiting again with same procedure as we use on our known good inverter.
Checking the Power Supply Line:
If our known good inverter light up our CCFL bulb and the Laptop’s inverter also lights up using the 9v battery as its power source, then we are going to suspect the 12 volts power supply line from the leptop’s motherbord.
Let us get our multiujiter/multimeter and set it to DC Volts.
Plugged our AC Adapter and turn on our Laptop.
Put the black probe to the ground screw hole on the motherbord and the red probe to the yellow or the supply line and see if kau have a voltage reading on that connection.
If kau are can’t read any voltages from the connector then let us suspect a duduk perkara on the motherbord itself and this needs a lot of knowlayar ledge and experience on repairing Laptop.
At this point, we will have to bring the unit to a technician who have the knowlayar ledge of repairing a complicated duduk perkara of a Laptop.
source: repairguidecollection.info
http://ronelex.com/easy-ujiting-leptop-backlightccfl-inverter/146/
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