Hp Pavilion Notebook screen flickers

hello,

I have a Hp Pavilion DV7-4177nr . I just replaced the bottom case since the thread that resides on the case which holds the LCD panel/hinges, broke off. I assume this was an invoked by an assembly mistake prior to me taking over.

If i push back the screen back - adding a little bit of pressure as if I was opening the laptop - the screen shows fine. As soon as I release it starts to flickers again.

Could my flickering problem be related to the hinges, video cable or a different sensor I am overlooking?

Thx
tobe1424Asked:
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Tony GiangrecoCommented:
Yes, the problem could be related to the hinges, cable or possibly damage to the screen.

There is also a possibliity your screen resolution is set wrong, but since you have been making repairs, it's probably related to that activity
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dbruntonQuid, Me Anxius Sum?Commented:
Video cable not properly fixed in socket?  and your pressure is making the contact.

Or perhaps a video cable being strained or flexed too much.

Or possibly the laptop has a video on/off switch which is meant to work when the laptop either opens or closed and at present it is jumping between the two states.  I suspect this isn't the fault but also keep it in mind.

Either way you are going to have to do some more dismantling and troubleshooting.

Also try the laptop plugged into an external monitor and see if the problem comes across.
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tobe1424Author Commented:
thx!

I forgot to mention earlier, that was my initial troubleshooting step. I plugged an external monitor. it works ok.

Actually, I thought the issue is the "switch" which is meant to work when the laptop open/closes - what you said. But I don't know where is this switch. Is it embedded with the entire LCD tray panel?

I also pushed down the video cable into the socket to ensure it is seated properly.

--
t
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dbruntonQuid, Me Anxius Sum?Commented:
A service guide may be here http://h10032.www1.hp.com/ctg/Manual/c02642701.pdf

I can't download and examine it myself at present.  That may answer the question as to the location of the switch.
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Tony GiangrecoCommented:
The inverter could be going bad also.
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nobusCommented:
it may be necessary to replace the video cable, it can be partly broken by the prior problem
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tobe1424Author Commented:
for some reason I am leaning towards the inverter. when i push back the screen it stays on fine. when i release the pressure I apply by the web cam area, the screen goes black again.

Pretty sure its the inverter?
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nobusCommented:
>>  when i push back the screen it stays on fine  <<  imo - that points to a bad contact.
that can be in the cable, as said, or on the inverter, or it's cable.
when it's black, do you see a very faint screen?
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tobe1424Author Commented:
hi nobus,

when i push back its a really light touch. Also when its blacks, i don't see the faint screen you refer - which i have seen in the past.

I dont have other parts to swap out and troubleshoot. But I want to make sure I order the correct part.

thx
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nobusCommented:
so it looks like you loose the video, and that points to the cable again
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tobe1424Author Commented:
I will be dismantling the screen today. Will update you later
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tobe1424Author Commented:
question. I just found an older 17" Hp Pavilion notebook. I was wondering if the inverter is a generic component that I may be able to swap to the new LCD ?

Or do i need an inverter specifically for my dv7-4177nr
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nobusCommented:
if the connectors are the same, you can try; but i'm not sure they use the same on all models
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tobe1424Author Commented:
i ordered the inverter..
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Tony GiangrecoCommented:
That's what I suggested on 9/11. Hopefully it will resolve the issue.
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tobe1424Author Commented:
..and also ordered the cable for giggles :)
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tobe1424Author Commented:
thx much! I will keep you posted asap
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tobe1424Author Commented:
so it was the vga cable indeed. I replaced the cable all seems fine.
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tobe1424Author Commented:
it was the connector on the motherboard that was bad..when i would push down on it, the screen would display perfect until i released it.
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nobusCommented:
tx for feedback
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tobe1424Author Commented:
so i installed the new video cable...same issue
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nobusCommented:
then it looks like a bad contact in the connector on the mobo
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tobe1424Author Commented:
that is what I am afraid of :/


it looks like someone took apart the laptop before I did...its possible that the laptop was re-assembled poorly

Since the contact on the mobo looks ok..I am wondering if the LCD has anything to do with flickering..but deep down inside i know - as you guys mentioned - this is a "contact/connector" issue so..

..can i be 100% certain it is not the LCD...and I stuck having to by a motherboard? or take it to a mobo specialist where they can possibly fix the mobo video connector?

Thanks much!
t
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nobusCommented:
google for laptop repair shops in your neighbourhood
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dbruntonQuid, Me Anxius Sum?Commented:
>>  or take it to a mobo specialist where they can possibly fix the mobo video connector?

They'd probably recommend board replacement.

You could try spraying electrical contact cleaner into the connector and seeing if that helps or perhaps you can try clamping the connector or wedging something into the connector to make a tighter connection.  All these you do at your own risk.
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tobe1424Author Commented:
thanks again..

I am going to try the electrical contact cleaner first ::crossing my fingers::

If that doesn't work, I have consulted with a local guy I know who specializes in mobo refurbs.

Either way, I will keep everyone posted.

t
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