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#20181 - 12/16/19 04:00 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Giovanni001]
Johnny_B Offline
VIPF Japhar
enthusiast

Registered: 03/08/15
Posts: 218
Loc: Netherlands
Sorry to hear but as I say earlier, it only helps if it's not a hardware issue.

Maybe it's still not working because one, or more nand flash chip pins does not soldered well, the ones which are used, or maybe it's because you have used your old nand flash chip.
However, when the programming went well, then there should be no reason to think that it's caused due this.
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Doing nothing leads to nothing.

------------- Please note, for technical support -------------
Will be given here, or on the jb8a8f8 forum and I prefer it in English.
Johnny B.

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#20195 - 12/17/19 03:04 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Johnny_B]
Giovanni001 Offline
stranger

Registered: 09/30/19
Posts: 21
Hello, it seems to be a hardware problem. I programmed a new Samsung chip as well as the old one and thanks to my trinocular stereomicroscope I soldered it clean but so far without success.
I have found that (the RT9018B Voltage Regulator) shows U807 on the capacitor C837 times 2.5V or 0.38V. The voltage regulator could be the problem. Could the Broadcom CPU be broken? I ordered the RT90188 Voltage Regulator but it will take a while, until it arrives.


Attachments
C837.jpg (66 downloads)


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#20197 - 12/17/19 05:59 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Giovanni001]
Johnny_B Offline
VIPF Japhar
enthusiast

Registered: 03/08/15
Posts: 218
Loc: Netherlands
Yeah, hard to say if it's due the dc to dc regulator, or caused due a to heavy load onto the Vout pin which is as far as I know used for the Cpu and the Network.

But I have here a Ohms overview, the VIN must be loading up to around the 1865ohms, and the VOUT 1215ohms.
Measured between a ground spot and the measurements spot.

But still, indeed it could be a defective Dc to Dc ic what is more common.


Attachments
Duo2-U807.jpg (62 downloads)

_________________________
Doing nothing leads to nothing.

------------- Please note, for technical support -------------
Will be given here, or on the jb8a8f8 forum and I prefer it in English.
Johnny B.

Click on the banner if you like to go there..

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#20206 - 12/19/19 04:01 AM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Johnny_B]
Giovanni001 Offline
stranger

Registered: 09/30/19
Posts: 21
My measurements on the U807:
Gnd---Gnd------800 ohm-------x--------VOUT = 0.38V
--x---60.00K----0.65k-------1.771M------ VIN = 3.34V

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#20209 - 12/19/19 04:36 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Giovanni001]
Johnny_B Offline
VIPF Japhar
enthusiast

Registered: 03/08/15
Posts: 218
Loc: Netherlands
The Vin voltage are fine, the Vout not, but that you already noticed.
As for the Vout ohm value, is indeed incorrect and could indeed be the U807 because it normally should deliver this voltage output when the circuit is 800ohms, but actually, you only know it for sure when you remove the U807 and to check if the ohm value goes up from the Vout, or just wait when you have the new one and see if it's helps.
_________________________
Doing nothing leads to nothing.

------------- Please note, for technical support -------------
Will be given here, or on the jb8a8f8 forum and I prefer it in English.
Johnny B.

Click on the banner if you like to go there..

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#20357 - 01/08/20 02:56 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Johnny_B]
Giovanni001 Offline
stranger

Registered: 09/30/19
Posts: 21
I installed the RT90188 Voltage Regulator, 2.5v voltage is there on C837, but the receiver still doesn't work. But I will keep trying.

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#22249 - 11/14/20 11:51 AM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Giovanni001]
Piotrekop Offline
stranger

Registered: 11/14/20
Posts: 3
@ Giovanni001
did you fix the Vu+ duo2? I have a similar problem with white led light.

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#22252 - 11/14/20 12:34 PM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Piotrekop]
Toysoft Online   content
Japhar Member
Carpal Tunnel

Registered: 10/21/10
Posts: 2649
Take a look here,

https://jb8a8f8.com/support/index.php?threads/duo2-white-light-fault.372/#post-3007

TS

Originally Posted By: Piotrekop
@ Giovanni001
did you fix the Vu+ duo2? I have a similar problem with white led light.
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#22263 - 11/15/20 05:35 AM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Giovanni001]
Piotrekop Offline
stranger

Registered: 11/14/20
Posts: 3
@Toysoft
we know this link. I have been at the stage of replacing capacitors for a month now, but I do not recommend doing it because it is very compiled and very difficult. I had to buy a lot of new tools for this repair. This is not a hobbyist job!

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#22264 - 11/15/20 06:19 AM Re: Broadcom BCM7424 VU+ Duo² white LED [Re: Piotrekop]
Admin Online   content
Japhar Member
Carpal Tunnel

Registered: 10/19/10
Posts: 9978
Did you had a chat with Johnny ? He could be the best person to talk with about your issue.

Admin

Originally Posted By: Piotrekop
@Toysoft
we know this link. I have been at the stage of replacing capacitors for a month now, but I do not recommend doing it because it is very compiled and very difficult. I had to buy a lot of new tools for this repair. This is not a hobbyist job!
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