A1398 late 2013 random shutdown with black screen

[manumathew.017]

Log attached:-
https://cdn.fbsbx.com/v/t59.2708-21...7005a399f59881b4cd1295e45634&oe=61AB9EE9&dl=1
Is it FDMF 6808 issue or something else? Could someone guide me where I should look first?

 

[2informaticos]

You can try clean ME BIOS, just in case.
But you should change FDMF6808N chips anyway.

 

[manumathew.017]

Will it be ok if I take FDMF6808N from an old board?

 

[manumathew.017]

If that's not fine can I order this one? Could you please confirm?

10.48US $ 16% OFF|(5 10 Stuk) 100% Nieuwe FDMF6808N Fdmf 6808N QFN 40 Chipset|Geintegreerde Schakelingen| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

nl.aliexpress.com

 

[2informaticos]

NOOO.
Buy FDMF6708 from reliable store, like Mouser, or Farnell.
You can also use FDMF3030 instead.
FDMF6808 is Apple proprietary chip, never sold for anyone else!

 

[manumathew.017]

SAD, It has 9 months to 1 year lead time in mouser and farnel, I may find some old board to remove this component. How are these buck converters are going bad? Is it only in the 2013 board? Will it be ok if I remove the component from an old 2012 board?

 

[2informaticos]

All FDMF6808N chips developed the same issue in time...

 

[manumathew.017]

Other than Aliexpress, I could only find this option

Lot of NEW FDMF6808N FDMF 6808N QFN 40pin Power IC chipset | eBay

Logic Board. If soldering a new Lead solder balls chip with Lead Free temperature curve (profile), it will overheat the new chip. Our Policy. Repair Services. iPad Parts. iPhone Parts.

www.ebay.com

https://www.ebay.com/str/laptopmbseller

 

[2informaticos]

Seems that you didn't understand.
New FDMF6808N doesn't exist...

 

[manumathew.017]

I am looking for a solution, Should I conclude that it can not be repaired until I buy it from Farnel or Mouser (With 1year delivery time ?)

 

[2informaticos]

Did you search for FDMF3030?

Using FDMF6808N chips recovered from scrap board cannot assure to get the problem fixed.

 

[manumathew.017]

Fdmf3030 is available, but it has a minimum order quantity requirement of 3000 qty.....
I'm stuck

 

[piernov]

FDMF6708N are in stock on Mouser here.
Also if you read pinned post you'll see that laptop_mb_seller/L2 Computers are old known scammers, never buy from them. And good luck finding genuine new ICs on Aliexpress these days, there's almost none. No one has new FMDF6808N anyway, they are all pulled from dead boards.

 

[manumathew.017]

Thanks for the message, Are FDMF6708N, FDMF6808N, and FDMF3030 the same ??

 

[2informaticos]

You can use any of FDMF6708/3030 to replace FDMF6808.

 

[manumathew.017]

I have changed all the three FDMF6808 from mouser, Now I get only 1.3V on its output , Laptop is not powering ON , Fans are running

 

[2informaticos]

It powers up, if fans spin; not booting is other thing.
Don't make confusion.

Did you solder FDMF6708?

 

[manumathew.017]

Yes, I have soldered them, Is there a way I can make sure I have soldered all three of them properly?
Because I can see 1.33V at the output, One out of three-chip is heating up too much...

 

[2informaticos]

Did you apply leaded solder on the board and chips pads?
I hope you've removed CPU heatsink first.

 

[manumathew.017]

I have used a hot air gun with a 500 deg temperature to remove the IC, the Same for soldering also... can I try to add more solder lead using a soldering iron.
Yes, I have removed the CPU heatsink before doing the rework.