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Bad laptop LCD - bad backlight or inverter? (Resolved).

Dell Inspiron E1505 ccfl backlight florescent inverter fluorescent laptop

Best Answer phillpower2 , 31 August 2016 - 01:47 AM

Hello High_Tech_Redneck, As you can see the images in the background on the screen it suggests that the screen and video cable are ok and that the problem is with the backlight, I would recomm... Go to the full post »


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#1
High_Tech_Redneck

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I'm preparing to replace the built-in monitor's lcd panel on a Dell Inspiron E1505. It appears the failure is likely the backlight, rather than the inverter, but there are a couple symptoms that it's exhibited that I did not find much about when researching:

 

From what I understand, pink - flickering - dim, etc. indicate a failing backlight, while hissing sound typically is the inverter.

 

When it first started, it flickered pink for a few minutes, light went completely dark - with picture still on screen. That would sound like the backlight.

 

Here are the two interesting things:

 

-- Whenever it would flicker, it would also hiss. Can a flickering backlight *cause* the inverter to hiss?

 

-- If the computer is completely powered off for at least several months, then sometimes the LCD will display for a few hours (still dim pink). After a while it will go back to a momentary flash, if at all, when first starting/ waking computer. (Then no light, but picture can be seen with flashlight.)

 

Do those symptoms also seem normal for a failing backlight? And that it's likely not just the inverter?


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#2
phillpower2

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Hello High_Tech_Redneck,

 

From what I understand, pink - flickering - dim, etc. indicate a failing backlight

 

 

Correct and when replacing the backlight it is best practice to also replace the inverter, you should be able to obtain both for around $20 and at around $5 it really is not worth not replacing the inverter, it would fail at some point and possibly in the near future so avoid the time and trouble of dismantling the notebook again by replacing both now.

 

Hope this answers your question sufficiently  :)


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#3
High_Tech_Redneck

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Thanks. That makes me think more about replacing the actual backlight, rather than the lcd panel. $25 would beat ~ $50 for a new panel.

 

Just realized something...new panel wouldn't necessarily come with an inverter, would it?

 

The lcd itself was last replaced in 2009 (original one had a defect). Should it be good to go, or any chance it would be better to replace entire panel, vs. just backlight and inverter?


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#4
phillpower2

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Hello High_Tech_Redneck,

 

As you can see the images in the background on the screen it suggests that the screen and video cable are ok and that the problem is with the backlight, I would recommend that you connect the notebook to an external display to see if the image on that screen was ok before ordering any new parts.

 

A new panel will come with an inverter (example here) your call on whether or not you would rather have a whole new screen I`m afraid.


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#5
High_Tech_Redneck

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Thanks. Yep, external output is still fine, picture fine on screen, etc. Will research and see what looks good, but now I've got some extra info/ ideas.

 

Thanks for the quick responses and helpful info. Aloha!


Edited by High_Tech_Redneck, 31 August 2016 - 03:25 PM.

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#6
phillpower2

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You are most welcome High_Tech_Redneck, glad we could help  :)


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