Laptop Backlight Failure

SweatyOmnivore · 05-12-2009, 03:12 AM

Hi guys hope you can help me.

I have a laptop screen that the backlight is not powering up on. I have changed the screen and the inverter board and still nothing. Im really stumped because i thought changing both out would actually sort the problem.

Im not really sure where to go from here.

any help would be appreciated.

**TriggerFinger** · 05-12-2009, 03:51 AM

I suggest you open laptop again and check each connection. Also hook it up with an external monitor.

SweatyOmnivore · 05-13-2009, 12:39 AM

Ok i plugged it into different monitor that seemed ok the post came up and vista would have if the monitor supported the laptops native resolution, i have posted pictures of the cables in attachments. ty.

**TriggerFinger** · 05-13-2009, 09:40 AM

have you tried a different video cable?

SweatyOmnivore · 05-13-2009, 11:37 AM

Thats the one on the back of the screen isnt it? tbh i dont even know where to looking for a replacement let alone take out the old video cable. Im pretty sure its power to the backlight as i still get video when i shine light on the screen. im just stumped as i thought replacing and the power inverter and the screen would work. im also pretty sure i got the right parts down to the model no but i did notice there where quite a few laptops the same inverter worked with and the one i got for this laptop was out of an acer and i put it into a advent but still its the same model no. inverter.

**TriggerFinger** · 05-13-2009, 03:13 PM

If you see a faint image on the LCD then yes, it could be the backlight or the inverter. But you said you replaced both of these parts already. In that case I guess one of the parts you got is defective (assuming they are not brand new).

I have read an article on how to test an inverter but I have not tried it yet. Here's a link: http://www.fonerbooks.com/test.htm

SweatyOmnivore · 05-14-2009, 01:13 AM

Well both were new and tested i think. ive posted pics of the old inverter. the model number on the front is the same but on the right hand side connector there is a number (see picture) on the old connector it is 612 on the new one it is 568 im not sure if this matters or not.

**TriggerFinger** · 05-14-2009, 01:33 AM

I am clueless if those numbers mean something. What I usually do is just compare the part numbers if they are available.

If you still have the old LCD and inverter then I suggest you do a mix and match. Use the old LCD with the new inverter / new LCD with old inverter hoping you get a good working combination.

05-12-2009, 03:12 AM	#1 (permalink)
SweatyOmnivore Registered User Join Date: Mar 2008 Posts: 12 OS: Windows Vista	Laptop Backlight Failure Hi guys hope you can help me. I have a laptop screen that the backlight is not powering up on. I have changed the screen and the inverter board and still nothing. Im really stumped because i thought changing both out would actually sort the problem. Im not really sure where to go from here. any help would be appreciated.

05-12-2009, 03:51 AM	#2 (permalink)
TriggerFinger Moderator Hardware Team Join Date: Jan 2008 Location: USA Posts: 11,853 OS: Vista SP1, XP SP3, PCLinuxOS2007	Re: Laptop Backlight Failure I suggest you open laptop again and check each connection. Also hook it up with an external monitor. __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD - ImgBurn - HDD Diags - Disk Copy HOW TO BURN AN ISO FILE

05-13-2009, 09:40 AM	#4 (permalink)
TriggerFinger Moderator Hardware Team Join Date: Jan 2008 Location: USA Posts: 11,853 OS: Vista SP1, XP SP3, PCLinuxOS2007	Re: Laptop Backlight Failure have you tried a different video cable? __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD - ImgBurn - HDD Diags - Disk Copy HOW TO BURN AN ISO FILE Last edited by TriggerFinger; 05-13-2009 at 09:47 AM.

05-13-2009, 11:37 AM	#5 (permalink)
SweatyOmnivore Registered User Join Date: Mar 2008 Posts: 12 OS: Windows Vista	Re: Laptop Backlight Failure Thats the one on the back of the screen isnt it? tbh i dont even know where to looking for a replacement let alone take out the old video cable. Im pretty sure its power to the backlight as i still get video when i shine light on the screen. im just stumped as i thought replacing and the power inverter and the screen would work. im also pretty sure i got the right parts down to the model no but i did notice there where quite a few laptops the same inverter worked with and the one i got for this laptop was out of an acer and i put it into a advent but still its the same model no. inverter.

05-13-2009, 03:13 PM	#6 (permalink)
TriggerFinger Moderator Hardware Team Join Date: Jan 2008 Location: USA Posts: 11,853 OS: Vista SP1, XP SP3, PCLinuxOS2007	Re: Laptop Backlight Failure If you see a faint image on the LCD then yes, it could be the backlight or the inverter. But you said you replaced both of these parts already. In that case I guess one of the parts you got is defective (assuming they are not brand new). I have read an article on how to test an inverter but I have not tried it yet. Here's a link: http://www.fonerbooks.com/test.htm __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD - ImgBurn - HDD Diags - Disk Copy HOW TO BURN AN ISO FILE

05-14-2009, 01:33 AM	#8 (permalink)
TriggerFinger Moderator Hardware Team Join Date: Jan 2008 Location: USA Posts: 11,853 OS: Vista SP1, XP SP3, PCLinuxOS2007	Re: Laptop Backlight Failure I am clueless if those numbers mean something. What I usually do is just compare the part numbers if they are available. If you still have the old LCD and inverter then I suggest you do a mix and match. Use the old LCD with the new inverter / new LCD with old inverter hoping you get a good working combination. __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD - ImgBurn - HDD Diags - Disk Copy HOW TO BURN AN ISO FILE