Author Topic: What's this please? (Component Advice)  (Read 537003 times)

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Online helius

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Re: What's this please? (Component Advice)
« Reply #975 on: May 01, 2016, 12:32:39 pm »
The corrupted images I can see are hosted on this site. Not VinzC's post hosted on imgur: that's a perfectly functional image. (It just happens to be a screenshot of a corrupted image display, but ceci n'est pas une pipe.)
As noted by amyk the issue was discovered late last year: https://www.eevblog.com/forum/chat/forum's-posts-attachment-damaged/25/
On the second page of the above thread, it appears that different users are seeing different versions of the corrupted files.
In #27, BravoV shows his hexdump of a file called "a.jpg" posted by Mechatrommer in March 14, 2011 (server time). It contains the date string "2011:03:03 15:49:58".
In #28, PA0PBZ shows his own hexdump of what is believed to be the same file. It contains a different date string "2011:03:02 16:21:12"!
When I download the file from https://www.eevblog.com/forum/chat/salvaging-old-electronics-parts-and-save-the-world/
(a.jpg), my copy contains the date string "2011:03:14 16:48:42". This means that different users are seeing different bytes when they request the same file from the server.
I would suggest raising the issue with CloudFlare.
 

Offline VinzC

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Re: What's this please? (Component Advice)
« Reply #976 on: May 01, 2016, 12:34:53 pm »
Are all the corrupted images all hosted on imgur.com? The one I looked at was.

Looks like corrupted data in a cache somewhere. Imgur sets its cache-control max-age to about 36 days in the http responses. If you wait a month or so, the pictures might come good.
'M hoping I'll remember to come and check in a month or so  :-DD .

EDIT: Looks like this issue has been seriously taken on so thanks for your efforts investigating. I'm a bit late though, not always the first one to notice  ::).
« Last Edit: May 01, 2016, 12:41:38 pm by VinzC »
 

Offline amyk

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Re: What's this please? (Component Advice)
« Reply #977 on: May 01, 2016, 02:29:27 pm »
The corrupted images I can see are hosted on this site. Not VinzC's post hosted on imgur: that's a perfectly functional image. (It just happens to be a screenshot of a corrupted image display, but ceci n'est pas une pipe.)
As noted by amyk the issue was discovered late last year: https://www.eevblog.com/forum/chat/forum's-posts-attachment-damaged/25/
On the second page of the above thread, it appears that different users are seeing different versions of the corrupted files.
In #27, BravoV shows his hexdump of a file called "a.jpg" posted by Mechatrommer in March 14, 2011 (server time). It contains the date string "2011:03:03 15:49:58".
In #28, PA0PBZ shows his own hexdump of what is believed to be the same file. It contains a different date string "2011:03:02 16:21:12"!
When I download the file from https://www.eevblog.com/forum/chat/salvaging-old-electronics-parts-and-save-the-world/
(a.jpg), my copy contains the date string "2011:03:14 16:48:42". This means that different users are seeing different bytes when they request the same file from the server.
I would suggest raising the issue with CloudFlare.
I just downloaded it now, there are no bytes with value 13 in it so it is corrupted, and its date string says "2011:03:14 16:39:50". :wtf:

For future reference, the version I downloaded and inspected has this SHA-1 hash:
Code: [Select]
fdb20f2bf8d02d9faf92ac8524aa04b177dee31e  a.jpg
I suspect there is some sort of text-filtering being applied to those files (but why not the later ones...?), which would explain the lack of byte 13 and strings being changed around.
 

Offline Mark

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Re: What's this please? (Component Advice)
« Reply #978 on: May 10, 2016, 04:34:38 pm »
Any idea what this is? 

Surface mount metal can with a hole in it.   It is getting very hot and draining the battery of this phone.  No error messages reported by the android OS. 

 

Offline Fortran

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Re: What's this please? (Component Advice)
« Reply #979 on: May 10, 2016, 04:41:33 pm »
It looks like a barometric sensor.
Don't recognize the numbers though.
 

Offline CJay

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Re: What's this please? (Component Advice)
« Reply #980 on: May 10, 2016, 05:08:09 pm »
It looks like a barometric sensor.
Don't recognize the numbers though.
Could well be, could also be a microphone, the OP could clarify the model of the phone and perhaps tell us if it's working for making calls, I.E. incoming/outgoing audio.
 

Offline jitter

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Re: What's this please? (Component Advice)
« Reply #981 on: May 10, 2016, 05:11:38 pm »
The microphone is visible in the top picture and it looks like what I would have expected for a condensor type mic.
I agree that it's likely a pressure sensor, hence the hole in the can.

A quick google on "pressure sensor"  images turns up several that look similar.

« Last Edit: May 10, 2016, 05:13:24 pm by jitter »
 

Offline Fortran

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Re: What's this please? (Component Advice)
« Reply #982 on: May 10, 2016, 05:17:28 pm »
According to the label on the first picture, it looks like a Ulefone Be Touch 2.
Doesn't seem to have pressure sensors.
 

Offline Fortran

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Re: What's this please? (Component Advice)
« Reply #983 on: May 10, 2016, 05:28:40 pm »
 

Offline Mark

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Re: What's this please? (Component Advice)
« Reply #984 on: May 10, 2016, 06:11:42 pm »
Thanks everyone, unfortunately I read the first reply and thought I could live without a sensor so I took it off the board...  now I can't make calls  :-DD 
It seems that the mic was getting heat from a regulator on the other side of the board.  Not sure what the next step is, I don't have schematics to go on but I might look for replacement boards on aliexpress etc. 
 

Offline jitter

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Re: What's this please? (Component Advice)
« Reply #985 on: May 10, 2016, 06:24:57 pm »
Hmm, I stand corrected.
Now that the mic has been removed, does the regulator still get that hot?
 

Offline Mark

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Re: What's this please? (Component Advice)
« Reply #986 on: May 10, 2016, 09:29:16 pm »
Hmm, I stand corrected.
Now that the mic has been removed, does the regulator still get that hot?

Yes, it is still hot.  The battery charges very slowly and drains very quickly.  Apart from that, the phone is functional.  I have ordered a new charger/mic board from aliexpress, but I suppose it could be anything on the main board.  The phone is "under warranty" from gearbest, but I'd rather have a go at trying to fix it myself than risk sending it back to china...
 

Offline jitter

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Re: What's this please? (Component Advice)
« Reply #987 on: May 11, 2016, 05:29:33 am »
There must be a reason why that regulator gets so hot. I can't imagine it's its normal operating temp if it can get the casing of the mic to go above 70° C.
Perhaps continue this in the repair section?
 

Offline Gary350z

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Re: What's this please? (Component Advice)
« Reply #988 on: May 31, 2016, 05:11:54 am »
What's this part? :)
 

Offline Back2Volts

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Re: What's this please? (Component Advice)
« Reply #989 on: June 02, 2016, 01:14:32 am »
What's this part? :)
It is a MOSFET car elevator  :-DD
 

Online Vgkid

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Re: What's this please? (Component Advice)
« Reply #990 on: June 16, 2016, 03:18:10 am »
8 pin smd. 3.0x3.1mm body
marked.
 MF EL
m101
and a
soic-14, ST Semiconductor
91p944
« Last Edit: June 16, 2016, 05:53:33 am by Vgkid »
If you own any North Hills Electronics gear, message me. L&N Fan
 

Offline halexa

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Re: What's this please? (Component Advice)
« Reply #991 on: June 16, 2016, 05:20:18 am »
What's this part? :)
Automotive rated MOSFET?
 

Offline Brumby

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Re: What's this please? (Component Advice)
« Reply #992 on: June 16, 2016, 05:37:15 am »
It obviously needs a MOSFET driver.....
 

Offline FireFlower

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Re: What's this please? (Component Advice)
« Reply #993 on: June 16, 2016, 08:46:55 pm »
Hmm, can you hand solder succesfully 0.3mm µBGA chips? :D


 

Offline djQUAN

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Re: What's this please? (Component Advice)
« Reply #994 on: July 03, 2016, 01:52:16 pm »
I need help identifying the LED. I got these from a local scrapper and he has lots of these (1000s) in a bin. He said it was Cree but I could not find any info from them. The guy did say it came from Blackberry phones as the camera flash LEDs. Reversing the polarity and it lights up red.

The die looks about the size of a 1W LED and appears similar to Cree dies.

The flex PCB also has these round things. Im not exactly sure but they look like condenser mics although it looks like an unusual place to put the mic beside the camera flash LED?

I mounted 24 of the LEDs on a PCB I have and it is quite bright.  ;D
« Last Edit: July 03, 2016, 01:56:19 pm by djQUAN »
 

Offline SeanB

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Re: What's this please? (Component Advice)
« Reply #995 on: July 03, 2016, 02:53:55 pm »
Not microphone but the handsfree speaker.
 

Offline djQUAN

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Re: What's this please? (Component Advice)
« Reply #996 on: July 03, 2016, 04:31:23 pm »
I'm not sure it is a speaker. I should have put a ruler beside it.

It is about 4mm in diameter and about 1.3mm thick.
 

Offline Don Hills

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Re: What's this please? (Component Advice)
« Reply #997 on: July 05, 2016, 01:29:02 am »
It's likely to be a speaker, looking at the heavy construction and liberal bonding to the PCB for additional heat dissipation.
(Cell phone speakers are run very hard to get the acoustic output required. The voice coils are tiny and they get hot.)
Also, there wouldn't be a microphone in the middle of the back, whereas it's a logical location for a speaker / ringer transducer.

Edit: I take that back, my phone has a microphone next to the camera lens on the back.
« Last Edit: July 05, 2016, 01:30:52 am by Don Hills »
 

Offline Richard Crowley

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Re: What's this please? (Component Advice)
« Reply #998 on: July 05, 2016, 02:41:47 am »
Microphone on the back used when shooting videos with that camera. And also in some cases as a noise-cancelling microphone where they take the sound picked up by the back camera and subtract it from the microphone on the front.

That is much too beefy for a microphone. I would be much more inclined to call that a speaker.
 

Offline djQUAN

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Re: What's this please? (Component Advice)
« Reply #999 on: July 08, 2016, 05:03:53 pm »
I tried testing one first with a resistor, PSU and scope to see if it was an electret mic. And it was a lousy one at that as far as sensitivity is concerned so I took one apart.

Internal parts appear to be indeed an electret mic.

That is a 5mm LED for scale.

How about the LED I posted earlier, can anyone ID it?

 


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