Dell XPS 9560s Mainboard LA-E331P CAM00/01 Burned Component identification

Hello there,
I am new here, i hope its okay if i write in english, I want to repair a Dell XPS 9560s Mainboard (LA-E331P CAM00 / 01) i just dont find any schematics from that Mainboard online, I saw schematics from a XPS 9550 (LA-C361P) the schematics look very similar, but i am not sure if i can replace the burned IC with the one shown in the LA-C361P schematics;

Maybe somebody has access to the LA-E331P schematic or boardview and can provide me a data about that small area;

I have a picture of the LA-C361P Schematics, should be QV11, a picture from the forum from a burned LA-E331P and a picture of my burned 331P and a picture of a working 361P, sorry for so many numbers;




Best Regards
Maxim

G64 marking equals a DMP3050LVT transistor (datasheet attached). You can replace it directly with Si3457BDV or any other TSOP-6 (same pinout), P-CHANNEL transistor with Id ≥ 4.5A.

By the way, you should also replace the JEDP1 connector and matrix tape, because it is probably also burned.

After replacing all of the burned components measure the resistance to ground on pin 6 of burned transistor with connected matrix.

Hey, Thank you so much for your precise and qualified help!
Okay so i will order that IC, Yes i was thinking about to replace that connector, but i just dont find where to get it, the Schematics from the XPS 9550 say its a "ACES_59003-04006-001" but i just dont find any page where to buy one, it has 40 Pins;



- Maybe i dont have to replace it, because the burned Pins are 40 and 39, according to the scematics they are connected anyways so there should be no problem or i am wrong?

What do you mean with matrix tape? I dont know that word and if i check the internet i only find isolation tape (:

Cheers and Many thanks!

pantau napisał(a):Yes i was thinking about to replace that connector, but i just dont find where to get it, the Schematics from the XPS 9550 say its a "ACES_59003-04006-001" but i just dont find any page where to buy one, it has 40 Pins;

It is not easy to find it, but if you search "59003-04006" in Google images you will find some in China. Another option is to buy a damaged board and use it for parts.

pantau napisał(a):Maybe i dont have to replace it, because the burned Pins are 40 and 39, according to the scematics they are connected anyways so there should be no problem or i am wrong?

The pins 38, 39, 40 are not connected together for no reason. The reason is a higher current capacity through that connector (backlight power supply rail), so it necessary to replace that connector, otherwise the repair will no last long.

pantau napisał(a):What do you mean with matrix tape? I dont know that word and if i check the internet i only find isolation tape (:

Matrix tape, LVDS cable, ... is a flex cable between the LCD panel and motherboard (the cable, which is connected to that burned connector). Check, if the connector on that cable is also burned. If so, you should to replace that cable as well.

Thank you again for your precise reply!
I ordered the replacement parts,
For the connector i got a old LA-9412P where they used the exact same connector;

But to be honest i dont want to replace the cable and the connector because my soldering skills arent the best, and that connector seems to be difficult so desolder and solder, and i dont find a introduction how to dissamble the display part;

I pluged in the 40Pin connector and measured resistance between pin 1,2,3 and there is none, between 1 and to i have 0.02Ohm and between 1,3 i have 0 so i think thats fine or not?


Thank you guys so much!

Cheers

pantau napisał(a):But to be honest i dont want to replace the cable and the connector because my soldering skills arent the best, and that connector seems to be difficult so desolder and solder

To remove that connector from the board without damage it is need to preheat the board from the bottom side and then heat the connector with a hot air from the top side.

pantau napisał(a):I pluged in the 40Pin connector and measured resistance between pin 1,2,3 and there is none, between 1 and to i have 0.02Ohm and between 1,3 i have 0 so i think thats fine or not?

If you are sure that there are a good contacts on all pins between the connector and the LVDS cable it should be fine. In my opinion is better to replace it, because I don't trust it, if it seems burned.

Okay i went further with my project, i removed the short to ground on the mainboard, The isolation layer between burned because of the heat from the mosfet, now it seems to be fine, i just have to rebuild the circuit i had to remove,



then i connected the LVDS cable and i have a short again so i dissasembled the display, and matic was right the cable inside the display burned;


There is a replacement cable i can order, but i think i have to replace the connector too;
its a edp 40-pin connector right?

Do you think its possible to unsolder and solder a new there? Because i am worried to destroy the display glass because of the heat;


Thank you guys!

pantau napisał(a):its a edp 40-pin connector right?

Yes, there are different expressions for this connector.
For example 40-pin video connector, 40-pin LVDS connector, 40-pin EDP connector...

pantau napisał(a):Do you think its possible to unsolder and solder a new there? Because i am worried to destroy the display glass because of the heat;

Yes, it is possible but in this case with a soldering iron only. To remove it, you will need to destroy the old connector.

Before replacing the connector, check the resistance to ground on burned pins of that connector. The circuit on the matrix board may be also damaged.

Hello all,
Good News the laptop works!



- the Display was broken there where even more Shorts inside i desoldered the connector and still hat very Low resistance between the burened pins and Ground i already ordered a used Display for 110€ think Thats fine its Not a 4k one but i dont need that anyways

- i bought a cheap Board where i took the Mainboard Display connector from (and practised soldering in and Out a few Times )



- replaced the connector measured all Pins a few Times to Look for shorts and Used a microscope to Look if the soldering is okay



- to Check If it works i Used a Jumper Wire to Bridge the burned circuit because if i rebuild and then it doesnt work I would have had more Work


Tested with a Display from another Laptop

- so you guys know which of the 3. Options i have to choose? I called dell they refued to help, because they do Not Support such Kinds of repair

hank you 100 times!!
Now i will rebuild the burned circuit, wait for the Display to arrive and Run a few Benchmarks.

Cheers
Maxim

Hello There,
I have another problem, i am Back from Holidays now i Started to Finish this Project.
I rebuilded the circuit.

The Problem is i only habe the scematic from the XPS 9550, and Used the replacement components mentioned in that schematic.

Now the mosfet does Not Reach the Gate voltage to let enough current flow through. So the backlight does Not Work.
The Gate voltage is around 0.934V, the threshold ist 1V. The voltage getting lowered by passing throught a resistor and a capacitor parallel. I Used the 1M resistor from XPS9550 schematic, can i Just lower the resistor to Reach a Higher source voltage for my mosfet?

Or does anybody has the right schematic and ist able to Check for me?

Let me know If you Need More information
Cheers
Maxim

pantau napisał(a):The Gate voltage is around 0.934V, the threshold ist 1V.

If you measure the gate voltage to ground, 0.934V is correct voltage. Please also measure the other voltages in reference to ground - find attached pattern below.

pantau napisał(a):so you guys know which of the 3. Options i have to choose?

It should be a label under bottom cover.

Thaks for your reply,
I measured all Voltages in reference to ground. I made a Picture i measured three times, once with the battery attached only and one with the charger plugged in.
And to check the Voltages i opened up a XPS9550 from a friend and measured the Voltages there.



Found the Label now, But i anyway choosed anotherone, nevermind.

The Display worked once after letting the Laptop On for 1 Hour, i could dim and everything worked just fine. But i dont want to wait 1 hour all the time to use it .
I attached a Picture how the board looks like right now.



Thank you!
Cheers
Maxim