Laptop screen too dim, tried everything HELP!

September 7, 2011 at 16:15:57
Specs: Windows Vista, 3.0 Mhz/4GB
I own an HP laptop, model Pavillion dv4 1430US. The screen is extremely dim, I can really only see the screen and icons when holding a flashlight to the screen. I connected the laptop to an external monitor, works perfectly, so video card should be ok. Checked all display properties, brightness, etc. Did my research, this is what I have done thus far:

1. Replaced LCD screen with new LCD screen, same result
2. Re-installed old screen again
3. Installed new inverter, same result, screen still dim
4. Installed new LCD display cable, same result
5. Tried with old/new inverter, same result

I am pretty much at the end of my wits here. Questions:
- Do new screens come with LCD bulbs?
- Could there be an error with the motherboard?
- Some keys on the keyboard (e.g. ENTER) are not working - could this be a reason?

My guess is that there could also be a switch that is activated when the laptop is closed, maybe it is stuck.

ANY HELP/SUGGESTIONS WOULD BE GREATLY APPRECIATED!


See More: Laptop screen too dim, tried everything HELP!

Report •


#1
September 7, 2011 at 17:13:58
Not very many parts in the backlight - bulb, inverter and wiring. Did you test the inverter output?

Report •

#2
September 7, 2011 at 17:47:02
No, I simply replaced the old inverter with a new one, same result. Why?

Report •

#3
September 7, 2011 at 20:18:40
The next step is to connect the backlight and check for operation.

Report •

Related Solutions

#4
September 7, 2011 at 21:05:51
I fully connected all cables to the inverter (2) and the 4 connections to the new LCD screen. Still no light. Am I missing something here?

Report •

#5
September 8, 2011 at 00:39:04
Do you have a voltmeter so you can test the input and output of the inverter?

Report •

#6
September 8, 2011 at 01:06:46
Do you have a voltmeter so you can test the input and output of the inverter?

Report •

#7
September 8, 2011 at 06:05:53
No, I don't. Do you think that both the old and the brand new inverter could be bad or have the wrong voltage?

Report •

#8
September 8, 2011 at 11:57:10
Backlight could be bad or power to inverter

Report •

#9
September 8, 2011 at 12:28:00
---> PROBLEM SOLVED! After doing more research another cause could have been a blown backlight fuse on the motherboard which a) if you can identify the correct fuse and b) you know how to solder you can use solder to bridge the fuse. It was not necessary in this case. I decided to again use the new screen before returning it and it works now. I was assuming only one component was bad, turns out it was the old screen and the inverter (tested), possible the display cable as well which I did not switch again since it is the most work. Thank you for all your input!!!

Report •

#10
September 9, 2011 at 02:08:45
Good to hear that it got fixed. Thanks for the update.

Report •

Ask Question