HP 6730s no backlight

[rdb89]

Hi there, i'm trying to repair an hp 6730s w/o backlight. I try the display and the inverter with another notebook and they work. Now i was measuring voltage with a multimeter. The invterer has 7 input pin.
I've got:
pin 1: 19v
pin 2: 19v
pin 3: gnd
pin 4: gnd
pin 5: 1v
pin 6: 0.01v
pin 7: blank

On pin 5 i originally have a voltage of 3,3v but after some test the voltage fell down to 1v. How can i solve this problem? The voltage on pin are "right"? Thanks and sorry for my english

[lord]

Re: HP 6730s no backlight

Every inverter has 5 pins. 19V, GND, PWR and DIM. Try to find datasheet of the IC on inverter and try to identify which pin is PWR and which pin is DIM.
Then bring 3.3V-5V on pin that is for PWR, and 1,5V-2,5V on the DIM pin. The inverter should work.
I had one sony that had a problem with the inverter, couldn't find the error on the motherboard, so i connect the volatges manually. Everything is OK, just the backlight doens't shut down when laptop going to sleep, which wasn't a problem at the moment.

[rdb89]

Re: HP 6730s no backlight

This is my situation at the moment



Anyone can help me?

[lord]

Re: HP 6730s no backlight

Didn't you understand my post on what you must do??

[rdb89]

Re: HP 6730s no backlight

Ok, thanks for the reply. Where i can take this voltage from the motherboard?

[lord]

Re: HP 6730s no backlight

From USB

[lucco85]

Re: HP 6730s no backlight

From USB you can take 5v, you need 3vs
Can take from q36(FDC655BN)

[lord]

Re: HP 6730s no backlight

rdb89 - if you have a multimeter search the board for the voltages you need. It is not that hard.

And i would check the inverter cable for broken leads.

[dycc]

Re: HP 6730s no backlight

tu n'a qu'a suivre les lignes qui relient le pin 5 et 6 a la carte mère . généralement elles aboutissent sur le drain ou collecteur de transistors utilisés pour la commutation. tu n'aura qu'a les supprimer (les transistors) et récupérer la tension a la source ou l’émetteur du transistor concernés et le shunter directement au drain ou collecteur.en gros on supprime les interrupteurs commandés pour les remplacer part des court circuits . "l’inconvénient" si ça en est pour certain c'est de ne plus pouvoir faire varier la luminosité de l’écran .

[bogdan1611]

Re: HP 6730s no backlight

hi there i have the same notebook hp 6730s, i have the same problem no backlight i see the hp logo very very hard , i have 3.3v on pin 5 what should i try ? i want to mention that i have tried with different display and inverter ! waiting asap for an answer ! best regards

[extrem69]

Re: HP 6730s no backlight

I have same problem, have 3.3 on dim but always off, tried with 3 inverters and 3 lcds.

[ala_borbe]

Re: HP 6730s no backlight

is that amd/ati platoform?
if yes, reflow vga and it works, famous rs880... :/

[extrem69]

Re: HP 6730s no backlight

hi, this comes with intel cpu and intel graphics

[new]

Re: HP 6730s no backlight

problem is lid sensor switch . find it and remove it from the board the backlight will turn on