HP 15-AB289SA Black screen after replacing screen

[Andyd1970]

Hi Guys, My daughter crakced the screen on her HP laptop, so I bought a new screen, I removed the bezel and disconnected the cracked screen and carefully re fitted the new screen. I powered it up and got a black screen, so I thought I would fit the crakced screen to check it was the new screen and when I did power it up it was also black! I then realised I had not removed the battery! so I guess I have blown a black light fuse?

I have had a look on the board but none of the components have identification on them or by them, can any of you help please. My daughter is going mad as she needs to do her home work on it, so poor old dad is under pressure to fix it

Andy

[mielta]

Re: HP 15-AB289SA Black screen after replacing screen

Hi
you must mesure on LCD Connector pin1,2,3 there must be 3V
and on pin 39,40 there must be 19v

[caspian]

Re: HP 15-AB289SA Black screen after replacing screen

the mainboard model is DAX1BDMB6F0 rev. F
First, find its schematics file.
explain the symptoms such as: spinning fan, blinks, and so on.

[Andyd1970]

Re: HP 15-AB289SA Black screen after replacing screen

Hi Mielta.

OK, So I take it that pin 1 of the connector has the tiny white dot next to it?

[Andyd1970]

Re: HP 15-AB289SA Black screen after replacing screen

Hi Caspian, Where do I get the schematic from? Just googled but nothing that I can see, It basically powers up, no beeps, I can hear the hard drive running and the fan runs OK

[mielta]

Re: HP 15-AB289SA Black screen after replacing screen

yes that is right

[mielta]

Re: HP 15-AB289SA Black screen after replacing screen

here Schematic

[Andyd1970]

Re: HP 15-AB289SA Black screen after replacing screen

Thank you Mielta, I will check the voltages you stated, them try to locate the fuse from the schematic, fingers crossed

[spleenharvester]

Re: HP 15-AB289SA Black screen after replacing screen

Have you checked that it actually POSTs to an external display first?

[meritosari]

Re: HP 15-AB289SA Black screen after replacing screen

Now Quanta following as Asus with no marking code on PCB.

Check this link, but it quite confuse me, need boardview to compare it, but i think it doesn't present now.

http://laptopserviz.bg/enview/laptop...schematic.html

Anyway:

[mcplslg123]

Re: HP 15-AB289SA Black screen after replacing screen

here Schematic

This schematic is for compaq cq42 and his model is Pavillion15-Wrong schematic

[Andyd1970]

Re: HP 15-AB289SA Black screen after replacing screen

Hi Guys,

Sorry for delay, I have taken the voltages as per Mielta request:

With adapter plugged in but laptop not switched on:

1, 19.6v
2, 19.6v
3, 0v
39, 0v
40, 0v

With adapter plugged in and laptop switched on:

1, 19.5v
2, 19.5v
3, 0v
39, 3.3v
40, 3.3v

Thank you for your help

[Andyd1970]

Re: HP 15-AB289SA Black screen after replacing screen

Any ideas guy? daughter is going on at me

[caspian]

Re: HP 15-AB289SA Black screen after replacing screen

turn the laptop on and measure voltage on pins 4, 5, 34, 35, 36, 37, 38. take a lot of care not to short the pins together.

[Fast Alpha]

Re: HP 15-AB289SA Black screen after replacing screen

Try the laptop with the external monitor attached. Using the VGA or HDMI if you have that.
Check you connected the monitor to the board, with the cables pushed in properly.

Just a question for you, where did you buy your screen from?

The cable looks loose, make sure it is in right.

https://support.hp.com/gb-en/document/c04775036

[caspian]

Re: HP 15-AB289SA Black screen after replacing screen

That is right. Maybe, you do not properly insert the cable into the screen connector.