HP DV6 issue ?

[bianchi77]

Dear Members,

I have issue with HP DV6,
When I pressed on, Fan and LED run for few seconds and then off,
What could be the issue? Is it capacitors ?

I checked some tantalum caps on it, mostly on 12 ohms value / short.
Anyone has the schematic of this board ?

[bianchi77]

Re: HP DV6 issue ?

board code : DA0LX6MB6F2
REV F

[jasko_jacker]

Re: HP DV6 issue ?

check a short on +3V, +5V and check ec

[mcplslg123]

Re: HP DV6 issue ?

See if it matches your mobo.

[bianchi77]

Re: HP DV6 issue ?

check a short on +3V, +5V and check ec

ec = ?

[bianchi77]

Re: HP DV6 issue ?

See if it matches your mobo.

thanks for the schematic ..

Could be MOSFET near CPU ? PQ45,PQ51,PQ44,PQ53, since then I measure 330u caps, it's 12 ohms...?

Thanks

[bianchi77]

Re: HP DV6 issue ?

it's FDMS7692
N-Channel PowerTrench® MOSFET for PQ45,44,51,53

[jasko_jacker]

Re: HP DV6 issue ?

In the presence of an immediate shut off (without a loop, on -off-on), if we exclude a problem with the bios and / or the firmware of the EC (embedded controller), probably this is caused by the presence of a short on a voltage line that is activated only when the power button is pressed (go to state s0 https://en.wikipedia.org/wiki/Advanc...ower_Interface). In a motherboard (depend of the architecture) there are some tension that are always present and others that cames only after the power button is pressed.
Motherboard not powered:
check with multimeter in diode mode the coil of cpu, gpu, etc this test
allows us to know if there is a short (0000 -> bad >0001 seems ok) on a
main line
Motherboard ac powered:
check of the tensions that are always present (pag 35 and above) as power line of EC -> U7 , bios tension, etc (also these tensions depend on the architecture, in some cards the bios is powered subsequently...)
If the problem is not identified, a voltage must be injected directly on each line to see if any component heats up. The voltage must be chosen based on the line to be tested.
This is a problem that could be difficult to solve because there are so many components involved.

[bianchi77]

Re: HP DV6 issue ?

that U7 ?

[mcplslg123]

Re: HP DV6 issue ?

that U7 ?

No, that's PU7. U7 is KB3926QF-your sio on this mb. Schematic pg32

[mcplslg123]

Re: HP DV6 issue ?

thanks for the schematic ..

Could be MOSFET near CPU ? PQ45,PQ51,PQ44,PQ53, since then I measure 330u caps, it's 12 ohms...?

Thanks

I dont think 12 ohms is a short on vcore line.

[Jesse James]

Re: HP DV6 issue ?

I have a similar laptop with same symptoms and it is graphics chip failure

[Melamanti]

Re: HP DV6 issue ?

Jesse has it right.
It is the GPU, and it most likely will need a bios reprogramming when u re done.
Those things tend to get in protect mode when u rework something on them due to overheating.

[bianchi77]

Re: HP DV6 issue ?

I have a similar laptop with same symptoms and it is graphics chip failure

What was the solution ? change the chip ? is it in the market ?

[piernov]

Re: HP DV6 issue ?

216-0772000 is available from see-ic.
Might be possible to convert to UMA.

[bianchi77]

Re: HP DV6 issue ?

216-0772000 is available from see-ic.
Might be possible to convert to UMA.

Might be possible to convert to UMA....

UMA = ?

[jasko_jacker]

Re: HP DV6 issue ?

Might be possible to convert to UMA....

UMA = ?

UMA = Unified Memory Architeture , the dedicaded GPU (discrete ) with
his memory isn't present on motherboard, the video card used often shares the chip with the CPU and the memory used is that of the system.

In this case you have a discrete motherboard that must be converted into UMA due to a problem with the graphics card that cannot be easily solved.
The conversion requires less experience and specific equipment than the replacement of the graphics chip.

to get an idea but I don't know if the video is error free
https://www.youtube.com/watch?v=z2rGHb-RxKo

[bianchi77]

Re: HP DV6 issue ?

Is it related with the picture attached, I convert it to UMA and I don't have to change the VGA chip ? thanks

[bianchi77]

Re: HP DV6 issue ?

I tried to connect R151 to 3V but, the fan running very loud then off and my short tester (bulb) showing there is a short on power supply ?
what's wrong with it, do you reckon ? thanks

[jasko_jacker]

Re: HP DV6 issue ?

there are many changes to make before the ones you say, did you do them?
for example:
pg 3 -> remove Rb remove Rc Add Ra
pg 5 -> Add Rd Add Re Add Rc
pg 6 -> Add R77
and so on

Open schematic and search for UMA, then make a comparison between discrete and uma, make the changes you see