laptop display not working after disassembly & reassembly

Gigabyte / Ga-ma790gp-ds4h
January 3, 2015 at 14:00:06
Specs: Windows 7, AMD Phenom II X4 960T@4018 MHz/OCZ 4GB (2x2GB) DDR2 800MHz/PC2-8500
hi guys
iv got a bit of a odd problem and hoping for some ideas.
my laptop was obviously over heating as the fan started to rev up and down.
so i took of the heat sink and fan.cleaned everything and re-applyed arctic silver to the cpu & gpu like iv done a thousand times..
i then put everything back together and booted it up to a black screen?????
i then striped it down and re-did everything to make sure things were in place.
the laptop works perfectly with a external monitor from the vga or hdmi output.
i really need some ideas please as iv no clue whats causing it.

laptop specs>>>>>>>>>>>>>>>>>>>>>>>>

http://h20564.www2.hp.com/hpsc/doc/...

Microprocessor 2.2 GHz AMD Athlon II Dual-Core Processor P340
Microprocessor Cache Level 2 cache 1 MB
Memory 3 GB DDR3 (1 x 1024 MB + 1 x 2048 MB)
Memory Max Supports up to 8 GB DDR3 memory
Video Graphics ATI Mobility Radeon HD 5470 Graphics (switchable)
Video Memory up to 1661 MB total graphics memory with 512 MB DDR3 dedicated
Display 39.6 cm (15.6") diagonal High-Definition LED HP BrightView Display (1366 x 768)
Hard Drive 500 GB SATA Hard Disk Drive 7200 rpm

message edited by martin16v


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#1
January 3, 2015 at 14:20:31
I'd guess that you have dislodged, or broken, the display ribbon cable. It's easily done.

message edited by ijack


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#2
January 3, 2015 at 14:30:55
i did give the ribbon a wiggle hoping the screen would flash. thats probably the best thing for me to replace.
i held up a flash light to the screen to see if there was any faint image...but nothing.
also as its a led display theres no inverter to replace.

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#3
January 3, 2015 at 15:38:23
Best pull off any suspect connectors then pop them back in and out a few times before finally pressing them home. Oxide on connections is a common problem when a computer is worked on - sometimes the slightest movement can cause things to move to a bad spot. Same goes for edge connectors too (use a soft pencil eraser on these).

Always pop back and let us know the outcome - thanks

message edited by Derek


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Related Solutions

#4
January 3, 2015 at 16:01:27
The display probably uses one of those zero force connectors for the monitor, you need to make sure that it is inserted properly and lock down the retainer arm.

You have to be a little bit crazy to keep you from going insane.


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#5
January 4, 2015 at 14:49:27
hi guys
many thanks for all your suggestions.
i think i may have found the problem.can you take a look at the display port on the mobo and tell me what you think.
the pins look well messed up to me.the ribbon from the display just pushs into this port if that helps.
i have no idea what they should look like. so im finding it impossible to even attempt a fix as its so small.
http://i58.tinypic.com/111jy3b.jpg

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#6
January 4, 2015 at 15:00:00
They don't look too wrong to me, maybe you can point out what I'm not seeing. I think they are a form of "zero force connectors" as per #4 so it should be possible to gently remove and re-insert the cable. The port at the screen end is likely to be exactly the same - another possible suspect.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#7
January 4, 2015 at 15:20:01
7 odd ones. looks shorted??
the long black area is were the display gos.theres no locking clip
it just clips in place.
http://i60.tinypic.com/157m8tu.jpg

message edited by martin16v


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#8
January 4, 2015 at 15:47:40
Well, I guess they might look a bit blobby as if they have overheated.
If so there probably not much you can do about it.

Keep watching to see what others think though.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#9
January 4, 2015 at 18:08:51
I have not replaced the display except on one HP Laptop and that one had a light weight plastic lever that lifted to remove the cable and lightly snapped down to lock the cable in. You can go to HP's site and download your complete manual and there should also be a repair manual that will show step by step for all assemble/disassemble for all parts of the laptop including part numbers.

You have to be a little bit crazy to keep you from going insane.


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