alienware 15 r3 (La-D751p)

[Pfudaniel]

Hello people i got this alienware 15 r3 (La-D751p)

It has some weird issues wich i think is bios related.

usb ports on either sides dont work, the only usb that works is the 3.1 on the back ( next to charger ) i use a converter to be able to use the normal usb 3.0
if i wanne update my bios with f12 and ez flash i can select the file and pres Flash upgrade. But then nothing happens. no progress it just stands stil from 0%

I most also note that the lights on the side and the mousepad light dont work at all!
Also if i pres in windows shutdown the computer doesnt shutdown ( keyboard light stays on )
I hope anyone can tel me where to look for the problem!

for the rest everything works fine, windows runs can do anything without problems.

Thanks for taking ur time to read this !

Daniel

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

Ive tried flashing the bios with a programmer from this forum, same issues still persist.

There is no visual damage on the mainbord and subboard. Ive checked different forums and this model seem to have this problem alot. But no where is a solution to be found.
It is definatly hardware related.

[SMDFlea]

Re: alienware 15 r3 (La-D751p)

Check UU1 the power share chip . https://cdn.badcaps-static.com/pdfs/...0330b8f3d8.pdf

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

Check UU1 the power share chip . https://cdn.badcaps-static.com/pdfs/...0330b8f3d8.pdf

thank u so much for your respond SMDFlea, im gonne check this first thing in the morning !

Any tips how to exactly measure it ?
i shoud measure pin 1 and 12 for voltage?

Greetings Daniel

[SMDFlea]

Re: alienware 15 r3 (La-D751p)

Yes check voltage on 1 and 12,also check voltage on UU3 pins 1,3,4,5

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

Yes check voltage on 1 and 12,also check voltage on UU3 pins 1,3,4,5

Alright done that, added pictures with measurement
Thanks for taking ur time for me !

measurements are done with just the charger plugged in.

[SMDFlea]

Re: alienware 15 r3 (La-D751p)

Take same measurements on UU3 with the board powered up. Also post your bios backup in the bios requests forum for fixing

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

Take same measurements on UU3 with the board powered up. Also post your bios backup in the bios requests forum for fixing

done!
seems al voltage is there, il post bios fix in bios section now

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

There is many bios chips on this board it seems. UE2, UT2, UH4. And 2 more next to the gpu, UG13, UG15 . Im not sure if PU1300 is also one. I believe i shud flash UH4 correct ?

foto with al bios chips:

i took backup of UH4


shud the EC also be updated ? im not sure wich chip is that.

[SMDFlea]

Re: alienware 15 r3 (La-D751p)

done!
seems al voltage is there, il post bios fix in bios section now

Can you check those voltages again ,i think pin 3 should be 3.3V and pin 1 5V

[Scotchmist]

Re: alienware 15 r3 (La-D751p)

I have this board out waiting for mosfet.

Do you want me to dump all the bios IC?

[Pfudaniel]

Re: alienware 15 r3 (La-D751p)

Hi thanks al for respond, i've solved the problem by putting a new embedded controller (ec) on the board usb + lightning + shutdown works as it shud. again thanks !

[Cuzaov]

Re: alienware 15 r3 (La-D751p)

Hi Guys, I saw the forum here and I needed your help. My screen is dull (but it emits a very dark image). The part that controls the LCD Blacklight burned out. Could you send a photo or the name of the component. pls <3

[mon2]

Re: alienware 15 r3 (La-D751p)

How did it burn out ? Do you have a picture of the damaged part ?

Any silk screen (white text) markings on the circuit board ?

Post any pics of the backlight part that may be damaged.

[Cuzaov]

Re: alienware 15 r3 (La-D751p)

i don't know how to attach the image but i tried

[Cuzaov]

Re: alienware 15 r3 (La-D751p)

here

[mon2]

Re: alienware 15 r3 (La-D751p)

See attached. Part is QV1 on the logic board.

This is a mosfet.

Part # SI3457CDV-T1-GE3

https://www.mouser.ca/ProductDetail/...content=Vishay

[Cuzaov]

Re: alienware 15 r3 (La-D751p)

Omg, Thnak you so much. I do not know how to thank you.

[mon2]

Re: alienware 15 r3 (La-D751p)

We will party in Brazil after Covid dies Miss my 500,000 steps walking up to Corcovado (Rio). We rented a helicopter from Sugar Loaf(?) back in 2000 and flew over the beach. Amazing views.

https://www.aliexpress.com/item/1005...a4b6c40fb0fcd1

[Cuzaov]

Re: alienware 15 r3 (La-D751p)

for sure, we are going to have a great party here in brazil and then there in canada UHUH <3. Thanks men, now i will buy on aliexpress ^-^