A1398 emc2673 820-00426-a disable the discrete

[skynet85]

Hi all, you have a solution, information on jumpers to disable the discrete on A1398 820-00426-a.

[piernov]

Re: A1398 emc2673 820-00426-a disable the discrete

Should work the same as 820-3332.
https://www.badcaps.net/forum/showpo...47&postcount=3

[skynet85]

Re: A1398 emc2673 820-00426-a disable the discrete

Thanks , i am try this

[skynet85]

Re: A1398 emc2673 820-00426-a disable the discrete

Hello everyone. Initially it turned on, there was a gong, there was no image. I found two solutions to disable the discrete card and transfer to UMA, tried both, now: there is a gong, there is a backlight, there is no image. Was guided by the solution and the diagram from A1398 820-3332 in brackets,
signals LCD_MUX_SEL LCD_MUX_EN put on GND, L9330 L9410 (L8960 L8930) turned off, and applied 3.3v to LCD_BKLT_EN and LCD_PWR_EN.


One of the similar topics http://********/viewtopic.php?f=51&t=106005

Disconnected discrete on these devices. There GMUX is not alone, there is one mikruha that controls everything and the other is just an analog switch! What did you change? I would remove the U9600 microcircuit, then I would turn on the matrix power, the backlight resolution, and so on with five wires. Namely, LCD_MUX_EN -3.3v, LCD_PWR - selection from the built-in, LCD_BKL_EN-selection from the built-in, LCD_MUX_SEL- GND, well, supply 3.3 volts to the PWM backlight, and you turn off the discrete, even the power will not go to it. If the working processor and analog commutator, then you will immediately receive an image on the built-in Intel, if there is no image, check the analog commutator. Sometimes there is an apple and after loading it hangs. In general, I have often come across dependencies on these platforms immediately after loading. The described method immediately cuts off everything except the processor, if problems remain, then we look at the power supply of the processor, and then the percent itself.


Can you tell me what I'm doing wrong or it doesn't make sense Thank you

[skynet85]

Re: A1398 emc2673 820-00426-a disable the discrete

thank you all very much, I defeated him

[Sephir0th]

Re: A1398 emc2673 820-00426-a disable the discrete

Would you Share the solution, i mean what was wrong before?

[skynet85]

Re: A1398 emc2673 820-00426-a disable the discrete

Would you Share the solution, i mean what was wrong before?

We also need this solution ?

[leonemax81]

Re: A1398 emc2673 820-00426-a disable the discrete

skynet 85, then share the solution, I have the same macbook with the same defect, thanks.

[skynet85]

Re: A1398 emc2673 820-00426-a disable the discrete

I'll post it later

[nistel]

Re: A1398 emc2673 820-00426-a disable the discrete

Its not too late. It is not fair to not share the solution after all.

[moderator]

Re: A1398 emc2673 820-00426-a disable the discrete

thank you all very much, I defeated him

you were suppose to post the solution long back...please do....

Thanks in advance

[mon2]

Re: A1398 emc2673 820-00426-a disable the discrete

There are many that enter the witness protection program after they get the help they need from this forum.

[Vesko356]

Re: A1398 emc2673 820-00426-a disable the discrete

There are many that enter the witness protection program after they get the help they need from this forum.

I completely agree with you Mon, well said.

.

[moderator]

Re: A1398 emc2673 820-00426-a disable the discrete

There are many that enter the witness protection program after they get the help they need from this forum.

LOL

do think that sending private message will help by any chance?!?!

[coelectron]

Re: A1398 emc2673 820-00426-a disable the discrete

hello everybody, here the solution that i use in this case, i hope help all

Note: for good working is necessary OSX Sierra or older, maybe if you install upper this the machine after sleep show black screen.

[Ramu]

A1398 emc2673 820-00426-a disable the discrete

[BoozZzy]

Ok gays you wont solution.OK)))))

LCD_MUX_EN - 3.3v don't climb, that's how it should be
LCD_MUX_SEL - to GND
LCD_BKLT_EN and LCD_PWR_EN - 3.3v
DP_EXTRA_MUX_SEL_EG - to GND
and GPU_VCORE_EN R8236 - should be deleted

[BoozZzy]

PHOTO

[dellxps15]

you need also one wire to enable backlight once mac goues in sleep mode (like when u close the lcd and reopen it). check that line in the attached picture and adapt on your logic board.

[sachin452]

can anyone tell me how to solve this issue in a1398 820-00426 after discrete to uma conversion i am facing this issue once it goes in sleep mode the screen remain black kindly help tried conversion with this images below