Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted? - Badcaps

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kalilinux25

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#1

Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

05-16-2022, 07:24 PM

is it normal t have 1 ohms resistance to the CPU B+?

MOD Edit ,link to schematic https://www.badcaps.net/forum/showthread.php?t=74069

BAP10 LA-D751P REV 1.0

Last edited by SMDFlea; 10-02-2023, 02:03 AM. Reason: Added "Dell Alienware 17 R4 BAP10 LA-D751P" to thread title
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mon2

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#2

05-16-2022, 07:44 PM

Re: cpu b+ shorted?

Yes, it is possible.

See section 2.2 :

https://www.logi.wiki/index.php/Begi...with_no_reason
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kalilinux25

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#3

05-16-2022, 07:46 PM

Re: cpu b+ shorted?

Originally posted by mon2

Yes, it is possible.

See section 2.2 :

https://www.logi.wiki/index.php/Begi...with_no_reason

thanks I though my cpu is dead
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kalilinux25

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#4

05-16-2022, 08:22 PM

Re: cpu b+ shorted?

why when I attached the PL500 a cpu b+ line I got shortedd at my PR702 a 19v line.. When I remove the PL500 shorted 19v line missing .?? those it mean my short comes from the cpu b+ line?
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ktmmotocross

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#5

05-17-2022, 12:09 AM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

why dont u inject? with 10A 1V u see hotspot on CPU if it is dead. or u find bad capacitor. but i have two of them with bad cpu
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piernov

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#6

05-17-2022, 02:25 AM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

No you don't inject voltage, you check for a shorted high-side MOSFET…

OpenBoardView — https://github.com/OpenBoardView/OpenBoardView
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kalilinux25

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#7

05-17-2022, 08:01 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Originally posted by piernov

No you don't inject voltage, you check for a shorted high-side MOSFET…

I'm trying to remove all the ic that related to the cpu b+ line but the problem even a 500c heat I cant remove the ic , what a amzing board
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kalilinux25

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#8

05-17-2022, 08:05 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?
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mcplslg123

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#9

05-17-2022, 10:48 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Use a knife tip on your soldering iron and put some solder on all pins of mosfets first and then try removing it with a lot of good bga quality flux applied.
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mon2

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#10

05-18-2022, 04:01 AM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Multilayer pcbs like this one will have lots of heavy copper. This will make parts removal and soldering difficult. Do consider to buy an underside preheater to help. We recently bought the Hakko preheater unit but many on the market and clones on AliExpress.
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dellxps15

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#11

05-18-2022, 04:25 AM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Originally posted by kalilinux25

I'm trying to remove all the ic that related to the cpu b+ line but the problem even a 500c heat I cant remove the ic , what a amzing board

check all mosfet on cpu side by probing in diode mode drain-source and drain-gate and source-gate values. generally a shorted mosfet give low resistance on source-gate.
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kalilinux25

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#12

05-19-2022, 11:41 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Originally posted by mcplslg123

Use a knife tip on your soldering iron and put some solder on all pins of mosfets first and then try removing it with a lot of good bga quality flux applied.

I tried my hotair staion is jsut a yihua 858d
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kalilinux25

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#13

05-19-2022, 11:42 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Originally posted by mon2

Multilayer pcbs like this one will have lots of heavy copper. This will make parts removal and soldering difficult. Do consider to buy an underside preheater to help. We recently bought the Hakko preheater unit but many on the market and clones on AliExpress.

thanks for the good advice
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gtech83

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#14

10-02-2023, 01:01 AM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Anyone have info on PL500 Ferrite Bead Value Part info?
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gtech83

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#15

10-02-2023, 04:09 PM

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Found it
Attached Files

FBMA-11-453215-121A90T DataSheet - King Core Electronics Inc.pdf (261.9 KB, 25 views)
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Drassh

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#16

03-14-2024, 03:45 PM

Originally posted by gtech83

Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Found it

Thanks for sharing.
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