How to test whether lcd inverter or bulb is defective

Free tutorial on how to test whether the LCD bulb backlight or inverter board is defective. If your lcd does not display, then it does not mean that it is the inverter board that is defective

Category:

Howto & Style

Tags:

• how to test the inverter board
• inverter board
• lcd bulb test
• inverter board test

[rapkabi]

Hi mate i followed you instruction and concluded that LCD inverter is broken cause there was no backlight. I ordered another inverter and is still not working :S

COULD it be mother board? or something else?

if its mother board what do i have to check? Please help mate!

[jarcomtech]

@rapkabi

Did you check if you have signal display when you when you connect an external monitor to it? If so then kindly also check your video/data connection going to the motherboard. You may need to "re-sit" for proper connection, then reconnect your new inverter and test again. Let me know how you progress...

[jarcomtech]

Thanks for your comment. but pls be careful when testing the output of lcd inverter. If you use a tester you should set to an AC voltage of about 1K Volt. You can not power up the CCFL with just only 12Volts. Kindly check my blog at LaptopRepairGuide(dot)us  on how to make a home made lcd inverter and bulb tester, or pls check my other YouTube video tutorial on the subjest matter. Good luck!!!

[jarcomtech]

Hi, please check my new video entitled "How to test laptop inverter and bulb using a home-made tester". I hope this can help you solve your issue. Good luck

[jarcomtech]

Thanks for sharing a good tip to our visitors and subscribers. I used a crack screen because it is handy to me, as they are just lying around in my workplace, than getting another CCFL and wires to connect to it... but I appreciate your input. More power to you my friend!

[jarcomtech]

Getting another LCD as a tester is a faster and easier way for me to test the inverter, otherwise you need to buy a tester that has capability to test over 1Kilowatt of power, which I guess is more expensive. This I guess if very helpful and great tip for beginners... thank you!

[choppersteve22]

who has an extra lcd this is just pointless

[rapkabi]

@jarcomtech

I don't have external monitor so i connected to my tv with two male VGA connector and it didn't show anything :S

so what could be the problem?

thanks for reply mate!! m still repairing this same comp since 3 months lol

[KWEKUONE]

my oh my... this is some great tip for everyone. an old toshiba satellite m45-s331 i'm working on has a major screen issue. i just followed your tip, and the separate screen is on. i'm gonna order the backlight to see what happens.

thanks, pal. we appreciate people like ya.

[KWEKUONE]

@choppersteve22

no, it's not pointless. the problem lcd is with my toshiba satellite m45-s331 notebook.

i took an additional/extra lcd from a dell latitude d610. it worked.

his idea is great. try it; good luck.

[elgoose2003]

hey please is the green thing there the lcd inverter? mine only lights up wen i try to bearly connect it and wen i connect it all the way in it dont work it wont light the bulb that i know its working  i just replace it, is that my main wires that connect the lcd what dont work or is it the lcd inverter? i have a thinkpad t60

[potugadu]

Hi Jarcomtech,

I have a Lenovo/IBM Thinkpad T60P laptop, its screen/display started going blank from last one week very frequently, I have to close the laptop lid and open it to get the display back up again. I am tired of closing & opening the lid every 5 mins so I am using an external monitor with the laptop.

Can you tell what could be the problem with my display?

I suspect it is the backlight because when I reduce the brightness to its lowest the display stay up longer.

Thanks.

[davids456]

@choppersteve22 YOU COULD BUY A CRACKED LCD OFF EBAY FOR ABOUT £5 YOU RETARD. OR YOU COULD PAY ABOUT £80 FOR AN INVERTER TESTER. YOU DECIDE.