hp 14 ac005nx no display

[crowntoy99]

hp 14-ac005nx
hsb j mv-6
skittl10-6050a2730001-mb-a01

lap on but no display old bios is missing

i fund hp official web site in bios (080BD) lap tun on but 20 second display coming then black screen
after re flash bios saim issue
any idea ??

[jasko_jacker]

Re: hp 14 ac005nx no display

Try this

[crowntoy99]

Re: hp 14 ac005nx no display

Try this

thank you

black screen

[jasko_jacker]

Re: hp 14 ac005nx no display

Another bios
But your model have a discrete or uma motherboard ?

[crowntoy99]

Re: hp 14 ac005nx no display

Another bios
But your model have a discrete or uma motherboard ?

sorry its also black screen

[mcplslg123]

Re: hp 14 ac005nx no display

Try to measure voltage at led connector when there is display and compare what is missing when display goes black. Sonce display is coming for only 20 seconds, you may need to measure 4-5 pins at one go.

[crowntoy99]

Re: hp 14 ac005nx no display

Try to measure voltage at led connector when there is display and compare what is missing when display goes black. Sonce display is coming for only 20 seconds, you may need to measure 4-5 pins at one go.

pin out

1 . 19v
2 .19v
3 . 0.473v
4 . 3 v
5 . 0 v ( press power button coming 3.3v then 0v

6 . 0
7 3v

[mcplslg123]

Re: hp 14 ac005nx no display

Trace that Pin5 in mb. Some thing is perhaps making the 3v to cut off. You can cut that pin5 cable in the lvds cable and inject 3v from lab psu on that pin and switch on the mb. Observe what happens. In no case 3v from lab psu should go into mb. Be careful. I repeat-You need to give 3v on the cutted pin5 cable of lvds cable so that it reaches screen only.

[mcplslg123]

Re: hp 14 ac005nx no display

pin3 voltage is also suspicious-should be 3.3v

[mcplslg123]

Re: hp 14 ac005nx no display

Most of the inventec mb have 19v on pin1 &2 and 3.3v On pin3/4/5. So i think you need to trace those pins first.

[crowntoy99]

Re: hp 14 ac005nx no display

Most of the inventec mb have 19v on pin1 &2 and 3.3v On pin3/4/5. So i think you need to trace those pins first.

thank you sir

i find replays coil now its working

[String2016]

Re: hp 14 ac005nx no display

where is the coil located?you mean did you replaced it? can you please explain

[ktmmotocross]

Re: hp 14 ac005nx no display

burn coil in LVDS is mostly fuse behind 19V on LVDS

[subroto]

Re: hp 14 ac005nx no display

thank you sir

i find replays coil now its working

Where is the coil?

[subroto]

Re: hp 14 ac005nx no display

I'm facing the same problem. No picture, no light just display blank out after powering up.
No voltage on pin no. 4 and 5 but 3.3v on pin no. 3.
What to do now?
Mates please help me. Anyone have any idea or schematic of this model?

[crowntoy99]

Re: hp 14 ac005nx no display

Where is the coil?

bro its processor back said on board

[subroto]

Re: hp 14 ac005nx no display

bro its processor back said on board

I cant find the coil. Would you please help me to find it out bro?

[subroto]

Re: hp 14 ac005nx no display

Here is the picture of both side of mobo. Please help me to identify the coil.

[crowntoy99]

Re: hp 14 ac005nx no display

Here is the picture of both side of mobo. Please help me to identify the coil.

bro
sorry for late
see photo check the inductor

[subroto]

Re: hp 14 ac005nx no display

bro
sorry for late
see photo check the inductor

In my case, inductor shows 0 Ohm that means it shorted and ok. Then what to do? Any idea?
What was in your case?