Avatar of Robert Perez-Corona
Robert Perez-CoronaFlag for United States of America asked on

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
Laptops NotebooksHardwareComponents

Avatar of undefined
Last Comment
Robert Perez-Corona

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Tony Giangreco

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
See how we're fighting big data
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
dbrunton

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.
ASKER
Robert Perez-Corona

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
dbrunton

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.
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck
Tony Giangreco

The inverter could be going bad also.
nobus

it may be necessary to replace the video cable, it can be partly broken by the prior problem
ASKER
Robert Perez-Corona

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?
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.
SOLUTION
nobus

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
See how we're fighting big data
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
ASKER
Robert Perez-Corona

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
nobus

so it looks like you loose the video, and that points to the cable again
ASKER
Robert Perez-Corona

I will be dismantling the screen today. Will update you later
Your help has saved me hundreds of hours of internet surfing.
fblack61
ASKER
Robert Perez-Corona

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
nobus

if the connectors are the same, you can try; but i'm not sure they use the same on all models
ASKER
Robert Perez-Corona

i ordered the inverter..
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.
Tony Giangreco

That's what I suggested on 9/11. Hopefully it will resolve the issue.
ASKER
Robert Perez-Corona

..and also ordered the cable for giggles :)
ASKER
Robert Perez-Corona

thx much! I will keep you posted asap
This is the best money I have ever spent. I cannot not tell you how many times these folks have saved my bacon. I learn so much from the contributors.
rwheeler23
ASKER
Robert Perez-Corona

so it was the vga cable indeed. I replaced the cable all seems fine.
ASKER
Robert Perez-Corona

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.
nobus

tx for feedback
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.
ASKER
Robert Perez-Corona

so i installed the new video cable...same issue
nobus

then it looks like a bad contact in the connector on the mobo
ASKER
Robert Perez-Corona

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
Experts Exchange has (a) saved my job multiple times, (b) saved me hours, days, and even weeks of work, and often (c) makes me look like a superhero! This place is MAGIC!
Walt Forbes
nobus

google for laptop repair shops in your neighbourhood
dbrunton

>>  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.
ASKER
Robert Perez-Corona

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
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.