Screen randomly corrupt on HP Workstation Laptop

Hewlett-packard Nw9440 rm122ut 17" noteb...
February 1, 2012 at 11:23:18
Specs: Windows XP, Dual Core T7600
I have a HP NW9440 mobile Workstation laptop. Everything works perfectly but every now and again, without any real clue why, the screen goes distorted like an old TV struggling to tune in to a channel. Half the screen will streak down or is just gets corrupted badly but you can still make out what is there.
Funny thing is, if you give it a tap it stops. 99% of the time after a few taps and it seems to go for the rest of the time I work on it. It can go days without doing this then do it another day at boot up.
It is clearly a connection to the screen which otherwise is bright and faultless. I also checked an external monitor and when this happened on screen the monitor was perfect.
I read that this model can suffer from the LCD cable getting damaged but how would the explain how a light tap would put it right.
I stripped it down and checked it and the cable seems fine. The only bit I couldn't get to was the connectio behind the screen so this is my main suspect.
You guys are very knowlegeable so I thought ou might be familiar with the problem. Any suggestions?

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#1
February 1, 2012 at 12:33:51
I don't know the model but if you suspect that cables connection is bad I would replace it. If under warrenty let them replace it.

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#2
February 1, 2012 at 12:41:21
Alas this is a monster of a laptop but around 5-6 years old. No warranty left. I think it might be the connection behind the screen but would like some confirmation of its likelihood before I strip the screen down (don't really fancy doing that!)

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#3
February 1, 2012 at 14:47:25
After a little more research it would seem that the end of the LCD inverter cable that attaches to the back of the LCD screen is the wafer thin type that clips in (like keyboard connectors) and is held secure against the back of the LCD with yellow tape. I suspect it is this 'ribbon' type connector working loose occasionally; just enough to cause me trouble until a little tap realigns it. Looks like a messy job getting the cover off without removing the inverter, CCFL and screen.
Anyone familiar with this type of connection can advise...don't want to strip it all down if it is likely something else. Not sure buying another cable will make any difference.

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Related Solutions

#4
February 1, 2012 at 15:47:57
The invertor is responsible for the backlight, it plays no part in creating the actual image so it would be a different connector.

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#5
February 1, 2012 at 16:13:15
Sorry, confused that with the description off ebay of one of the cables I was looking at. Its the LCD screen cable. I already checked the connector to the mobo and followed the trail to where it goes into the screen but no further.

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#6
February 3, 2012 at 10:51:53
Solved it...well, I will when I get the LCD screen back off. A few helpful photos on the net show where the LCD cable connects to the back of the LCD screen. When the screen goes messed up, a little pressure there fixes it so I guess the connection is working loose.

Now, anyone know if I can simply remove the plastic back (the laptop lid) and access the back of the LCD screen without taking the whole screen apart?


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