HP G6 laptop display. Help!

[XmouseX]

Ok, so I bought a laptop from a guy who said the screen had broken and he removed it to put in a new one, but never did. So I got the laptop and plugged in an external monitor just to make sure it worked. It worked just fine! So I ordered a NEW LCD monitor and it plugged right in and bolted up properly. The problem is, I still have no video on the laptop. I pressed the FN + f4 key and it changes nothing. When I boot the laptop, the LCD backlight flicker for a second and then black. It works fine with an external monitor still....I am lost. I dont want to return the LCD as broken, because I really dont know..

[trebo]

Re: HP G6 laptop display. Help!

sound like a faulty inverter

[XmouseX]

Re: HP G6 laptop display. Help!

I though that too, but there is no inverter on these...I think it is LED. There is only 1 cable.

[mockingbird]

Re: HP G6 laptop display. Help!

The inverter isn't in the LCD with these models, it's in the laptop. I'm not sure it's an actual inverter, more like a control board.

[XmouseX]

Re: HP G6 laptop display. Help!

Hmmm. i will take a look. Any idea what it looks like?

[mockingbird]

Re: HP G6 laptop display. Help!

No, not yet. I have to replace a screen on a G56, so I'm sure I'll find out. My backlight is fine though, the screen is just smashed.

[XmouseX]

Re: HP G6 laptop display. Help!

So does anyone know anything about these laptops??

[heavymachines]

Re: HP G6 laptop display. Help!

So does anyone know anything about these laptops??

well i would imagine whatever controls the back light on these is dead and led use a controller no inverter circuit can you see an image with flashlight? BTW i personally think hp are junk and should not be bought by anybody to force this company out of business they been producing crap since 2005 but that's my opinion anyways you need to see if there is an image with a flashlight so we know whether its a controller issue or graphics all together

[tom66]

Re: HP G6 laptop display. Help!

HP went right down the toilet when they spun off their test equipment division as Agilent. Having a large R&D department designing innovate, leading edge stuff benefits the rest of the company. I had an 18 year old oscilloscope made by HP. It was built very well. And Agilent stuff is built very well. But new HP stuff is built very poorly.

[XmouseX]

Re: HP G6 laptop display. Help!

I see no image with a flash light. But the external monitor is working. I hope this answers your question..

[heavymachines]

Re: HP G6 laptop display. Help!

HP went right down the toilet when they spun off their test equipment division as Agilent. Having a large R&D department designing innovate, leading edge stuff benefits the rest of the company. I had an 18 year old oscilloscope made by HP. It was built very well. And Agilent stuff is built very well. But new HP stuff is built very poorly.

their old laptops are die hard but their 2005 and newer is junk along with their printers, pretty sad their 13 year old printers still out lived their new printers that may last a year LOL.

[heavymachines]

Re: HP G6 laptop display. Help!

I see no image with a flash light. But the external monitor is working. I hope this answers your question..

okay so now we know its not just a backlight issue its simply not sending any signal to its panel period...and the fn key is not switching monitors?...look for open resistors and fuses around that connector on that motherboard something got shorted or your cable is bad...and bad cables are well, all to common these days how i test cables is to totally remove the cable that runs from the mobo to the lcd panel you may need good lighting and sewing needles its how i test cables anyways, i take 2 sewing needles put on on each probe of the dmm and just tack it on with soldier don't need much and so you can remove it later but do a continuity test on diode setting if you get continuity example. pin 1 on one end and on the other you get a short reading on pin 1 and 2 when the other probe is still on 1 then there is a short. if that's the case you have 2 options either replace the cable or unwrap it and find the short...this problem could still be a reflow issue i have seen on older approx 2008 hp's where it would only display on external and not its own lcd and reflow fixed it.... but check for shorts on everything between the external vga connector to the internal led connector... do you have any way to test that led panel on a different led laptop? i have a little 10.1 led panel i use to test with on any laptop it don't care it still will send vid signal to it except sony vaio laptop them darn things are so proprietary its not funny, you can't even swap a sony vaio panel from one vaio model to a slightly different vaio, their even proprietary within themselves LOL. another trick i learned to do is apply pressure to the bga graphics chip before you power it on good firm palm pressure to the graphics chip then power it on and if it displays to the internal lcd then its no doubt hands down a reflow issue it may take a few trys but you have to apply the pressure before you turn it on ..on each try....

[heavymachines]

Re: HP G6 laptop display. Help!

okay so you bought a new panel and unsure its good ....sorry i had to read more lol ummm bout the only way to know for sure if that panel is good is to test it on a known good led laptop it can be a gateway dell compaq acer does not matter just needs to be led so you can test that panel but do not try it on a sony of any kind them suckers are rewired and will kill a standard panel i learned the hard way....and do a those other two tests as well vid cable and appy pressure to bga grapics chip but not soo much pressure you over flex the motherboard if you have to put somthin non conductive under it to support it while you do the "palm" test

and whats the full model of this g6?

[XmouseX]

Re: HP G6 laptop display. Help!

Because I repair electronics, I do have a reflow machine and I have performed reflows on dv6000 and dv9000 HP laptops. The thing is, usually the video doesnt work at all. Not even externally. The full model number is g6-1b67c. I sadly do not have any other laptops with LED to test it on....The cable does sound suspect and I like your idea for testing it!

[heavymachines]

Re: HP G6 laptop display. Help!

Because I repair electronics, I do have a reflow machine and I have performed reflows on dv6000 and dv9000 HP laptops. The thing is, usually the video doesnt work at all. Not even externally. The full model number is g6-1b67c. I sadly do not have any other laptops with LED to test it on....The cable does sound suspect and I like your idea for testing it!

well i can't count how many hp's i have worked on dv 4 ,5 and 6 and 7 and 9, tx series as well as g series, i have seen them do a range of things like on tx series wireless will disappear from hardware profile and or no display reflow fixed it, on dv 9 i have seen power on no vid, no power at all, and even power on with no vid but will display to external and reflow fixed it. so it really depends on what pin or pins came disconnected from the motherboard and yeah i have a reflow station as well and found that oven works best LOL....and lasts much longer then the reflow station and its not limited to nvidia chipset, seen dells and many other brands do the 7 beep error etc and seen ati and intel chipsets needed reflows as well so never rule out the possibilities cause the symptom is exactly like what you have dealt with. i am just trying to help ya ...

[heavymachines]

Re: HP G6 laptop display. Help!

well not having another led laptop makes it hard to test that panel....umm hows the cable look? kinked anywhere? you said you get a flicker for a sec can you find out what pin gets voltage before it drops? may sound stupid but have your tried massaging the vid cable to see if it will make any difference ?

[XmouseX]

Re: HP G6 laptop display. Help!

Thank Heavymachines! I am very thankful for your help, just frustrated with this laptop. I though it was just a broken screen, but I am now thinking the guy broke the screen so that I couldn't tell it had no video. I hope this is not the case though. I will check the cable and inspect the motherboard. What do you think about this - the display setting is detecting the monitor and the backlight flashes when I switch it to the LED panel. but then it switches back to the external monitor because I cannot see the click ok fo

[XmouseX]

Re: HP G6 laptop display. Help!

For these display settings....sorry hit send too early..lol

[heavymachines]

Re: HP G6 laptop display. Help!

you mean like click ok to keep settings? umm normally when you switch displays with the fn keys it does not ask that just switches only time i have seen it ask ok when you change resolution to keep settings, now if its not detecting the other display it will auto switch back... it may ask you on some models depends on the graphics driver, if you want to run clone or spanned view... but i will warn you hp uses real crappy panels innolux and chi mei and their probs range from lines to other artifacts and dead, i always replace them with samsung and lg panels.... so have you tried resetting connections? sometimes you can get them to display for a short bit before it goes out, also try flexing the pcb on back of lcd again don't over flex it on the panel you can normally get it to do something different that will hint you a panel issue, if that is case then panel is bad and suspect a kinked cable that may have shorted the panel out have had that happen before on an lovely hp....and one time on a Toshiba except on the Toshiba it fried the panel, vid cable and the graphics chip and that was one of the few extreme cases i have seen in my laptop repair days been working on computers since 1991 so i have seen many weird things happen.... but try those things and let me know the results and don't let it get to ya , your gonna need the patience to figure this one out....

[XmouseX]

Re: HP G6 laptop display. Help!

Thanks Heavymachines! I will try all and report back to you