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Author Topic: Unknown SOT-23 6pins marking code.Please identify!  (Read 2231 times)
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Kompir
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« on: May 04, 2011, 10:59:04 10:59 »

Hi,
I have GPS reciever which was powered by 12V DC instead of 5V DC.
So the GPS was damaged. The damaged component is a SOT-23 with 6 pins.
Would you help me to identify this part? The marking of this component is:

TBA
M828

Thanks in advance!
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Vague
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« Reply #1 on: May 04, 2011, 12:58:41 12:58 »

It might be an LM828M5 switched capacitor voltage convertor but I think this has only 5 pins
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« Reply #2 on: May 04, 2011, 03:51:00 15:51 »

Since it only has 6 pins and failing someone identfying the marking, find out and post what it's connected to....
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Parmin
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« Reply #3 on: May 05, 2011, 04:40:14 04:40 »

or take a photo of the surrounding area and post.
That way we can find out more.

How do you know that it is the damaged component?
does it turn charcoal?
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Kompir
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« Reply #4 on: May 05, 2011, 11:01:08 11:01 »

I will post a photo of the components area as soon as can. There are passive components around the damaged part -  I think most of them are capacitors. There was a short-circuit on the power circuit of the device. After the removal of the corresponding SOT-23 the short-circuit on the power is gone and pins 2 and 4 of the SOT-23 are short-circuit.
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Kompir
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« Reply #5 on: May 06, 2011, 08:18:34 08:18 »

Here is a picture of the pcb area around the damaged SOT-23.
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TomJackson69
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« Reply #6 on: May 07, 2011, 05:26:10 17:26 »

Could not find any thing for TBA M828. The only LM828 came up when search for TBA M828 as Vague has suggested above.

LM828 has five pins and it function is “CMOS charge-pump voltage converter inverts“. I can not see the whole PCB of your so here is my guess.

Since the SOT-23 laid close to a connector and I guest that is gLCD display connector (right/wrong ??). It does make sense that the LM828 could be used to convert +Voltage to –Voltage for the display. But it is FIVE pins so it may not be right.

More information on the PCB that could help to try to find a solution for the burning SOT-23. Such as picture of complete PCB, try to draw a schematic of that portion of the M828 and the surrounding components (this could find out 5 pins used or 6 pins used).

Here is a link to the data sheet:
http://www.national.com/ds/LM/LM828.pdf


Tom

Posted on: May 07, 2011, 05:12:34 17:12 - Automerged

ADM8828:  Switched-Capacitor Voltage Inverter with Shutdown

Here is a link to ADM8828:
http://www.analog.com/en/power-management/switched-capacitor-converters/adm8828/products/product.html

The ADM8828 has SIX pins; pin 5 is a shutdown pin. This could be a compatible device to the M828.

Please take a look and post what you find.

Tom  
« Last Edit: May 17, 2011, 08:49:33 08:49 by TomJackson69 » Logged

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Kompir
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« Reply #7 on: May 16, 2011, 09:57:26 21:57 »

Hi Tom, thank you for answer!
I bought the ADM8828 and solder it on the pcb but it seems this is not the right component.
When the gps is powered the ADM8828 becomes very hot. So thats why I think it is not the
right chip.
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« Reply #8 on: May 16, 2011, 10:59:56 22:59 »

How did you know which was pin 1 (did you reverse the ic), the picture is not clear for this.
can you not draw the circuit out, 2 pins are power 1 pin input (1 from power plug? other to circuit ground)
1 pin output (to power lcd or ic's)
leaves 2 pins, (do both have just caps to Gnd.?
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TomJackson69
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« Reply #9 on: May 17, 2011, 03:55:39 03:55 »

Kompir,

It seems like something else went bad that is why the SOT-23 burned at the first place. So, even the ADM8828 is compatible with the burned one; it will not work.

My best guess is to find out where pin 1 (output of the ADM8828) and pin2 (input) connected to. Without the ADM8828 in place, measure pin 2 to see what is the voltage. If pin 2 measured about 12V than for sure that is the input.

Why don’t you draw a simple circuit of the ADM8828 and the surrounding components; at least the components that is connected to the ADM8828. That way we can figure out if the ADM8828 is a correct part.

If pin 1 is connected to the gLCD power, then disconnect the gLCD and power up to see if the ADM8828 is still getting hot. If it is OK, measure the voltage on pin 2 o the ADM8828. What is the voltage?

Try to identify the gLCD and get it data sheet. The data sheet will help you when you trouble shoot the circuit.

Post whatever you find out here.

Tom
« Last Edit: May 17, 2011, 08:50:40 08:50 by TomJackson69 » Logged

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Kompir
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« Reply #10 on: May 27, 2011, 07:18:53 19:18 »

Hi Tom,
I was very busy last days. I was not able to repair the gps. i will buy a new one. Thanks for your efforts.
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