Regulator????

[killian6pk]

I was checking my Tcon for bad caps and found what I think is a regulator that I want to check out, but can't find a datasheet on it.
The number is AOU125. Does anyone recognize it? Has 3 legs and top Tab all soldered. Looks like a standard SOT223 package.

[budm]

Re: Regulator????

Did you check the voltage reading on all 3pins, that may give us some idea if it is fixed regulator or ADJUSABLE, or if it is a regulator. Is it labeled with Uxxx, or Qxxx?

[killian6pk]

Re: Regulator????

I just had another look and the number could also be AQU125. I did not get any hits on this number either for a data sheet.

[killian6pk]

Re: Regulator????

Did you check the voltage reading on all 3pins, that may give us some idea if it is fixed regulator or ADJUSABLE, or if it is a regulator. Is it labeled with Uxxx, or Qxxx?

The label is UP2. I have not hooked it up to AC yet wanted to see if I could find the datasheet to know what I was looking for. I will go ahead and try that.

[selldoor]

Re: Regulator????

An in focus picture might help and a close up of the component so we can try to read the part numbers

What is the part number of the board

[killian6pk]

Re: Regulator????

Reading left to right Tab at top. Pin1 = 3.27v Pin 2= 9.3mv Pin 3= 1.804v. I checked the tab also since pin 2 reading was so low and it read the same as pin 2.

That was with the power and backlights on and the ribbon cable from the main board to the TCon plugged in.

[killian6pk]

Re: Regulator????

An in focus picture might help and a close up of the component so we can try to read the part numbers

What is the part number of the board

That is what I was trying to do I have read the part number with a mag. glass and it is either AOU125 or AQU125 nothing else is written on the part. The location number on the board is UP2.

[selldoor]

Re: Regulator????

Yes I got all that but does the board have a part number for the whole board? and even
knowing what the board is off might help.

[killian6pk]

Re: Regulator????

The board is integrated into the LCD screen like monitors are. By that I mean the board is not replaceable. There is a number on it V315B5-XCN1. I don't think that number is going to help. This is the Vizio E321VL that I am working on. I have a thread started on it. I was just trying to see if anyone recognized this part number since I could not pull a Data Sheet on it. I think it is an LDO Regulator. I have tried DigiKey and Mouser both with no luck. I have also tried FindChips.com with no luck.

[budm]

Re: Regulator????

"Pin1 = 3.27v Pin 2= 9.3mv Pin 3= 1.804v." This read out does not look right, since pin3 is an input pin, pin2 is an output, pin1 is an adjust pin. The input voltage is lower than pin1, pin 2 shows about 0.
Lets check and see if the center pin is tied to ground, this may not be LDO regulator.

[selldoor]

Re: Regulator????

The board is integrated into the LCD screen like monitors are. By that I mean the board is not replaceable. There is a number on it V315B5-XCN1. I don't think that number is going to help.

Thats a bit unlucky - it seems sometimes the tcon and panel are fixed and sometimes have connectors.
There are some ( presumably with connecors) on ebay which doesnt really help
but perhaps you could message the seller ( One at least is in the US) and ask him if he would check the number on the component - his may be different but a suitable alternative?
There are boards on Taobao.com may be worth checking how much they are, just to get the part off?

[killian6pk]

Re: Regulator????

"Pin1 = 3.27v Pin 2= 9.3mv Pin 3= 1.804v." This read out does not look right, since pin3 is an input pin, pin2 is an output, pin1 is an adjust pin. The input voltage is lower than pin1, pin 2 shows about 0.
Lets check and see if the center pin is tied to ground, this may not be LDO regulator.

It does have continuity to ground. So if it is not a regulator what is your thought on what it is?

[budm]

Re: Regulator????

It still can be regulator but the pin out is not the same as 1117 series, in this case it looks like pin1 is an input pin, pin 3 is an output pin, pin2 is ground, the output is 1.8v which sounds rigth if it is 1.8V regulator.
Just have to find the spec sheet of this part to verify, and so far I did not find anything.

[killian6pk]

Re: Regulator????

It still can be regulator but the pin out is not the same as 1117 series, in this case it looks like pin1 is an input pin, pin 3 is an output pin, pin2 is ground, the output is 1.8v which sounds rigth if it is 1.8V regulator.
Just have to find the spec sheet of this part to verify, and so far I did not find anything.

I have not either. I have emailed Digikey tech support to see if they know what it is. They are usually very good at finding parts with old numbers. I am also stumped as to what the UP printed on the board means. I don't remember seeing that one before. I remember recently seeing a reference to a list of circuit board location abbreviations. I think it was on Wikipedia, but I'm not sure.

[killian6pk]

Re: Regulator????

Digikey could not find anything either. I was able to get a better look at the component by cleaning it and some more light. This is what the lettering looks like. The line is over just the letter A not any of the other letters or numbers.

[ecking767]

Re: Regulator????

That a LDO 1.8V output. its doesn't have any characteristics of being a transistor. Most likely its supply voltage to the IC chip.

[selldoor]

Re: Regulator????

If it were to begin with AO you could try asking here

http://www.aosmd.com/search?pn=AOU1

This show a mosfet which looks similar though I doubt if it is one as Budm would have
suggested it earlier. Anyway from the link you can see they have an enquiry centre in
california.

[killian6pk]

Re: Regulator????

That a LDO 1.8V output. its doesn't have any characteristics of being a transistor. Most likely its supply voltage to the IC chip.

How were you able to determine that from the part number? I have tried every search I could and could not come up with what kind of part it is.

[killian6pk]

Re: Regulator????

If it were to begin with AO you could try asking here

http://www.aosmd.com/search?pn=AOU1

This show a mosfet which looks similar though I doubt if it is one as Budm would have
suggested it earlier. Anyway from the link you can see they have an enquiry centre in
california.

Thanks I looked at them earlier when I thought it the number was AOU, but they don't have anything that registers with the 125 that is a part of the number. I thought that line over the A might mean something to someone.

[killian6pk]

Re: Regulator????

I am going to try to check pin3 since Bud thinks that might be an output voltage. I will check for continuity to other places on the board and see if that helps determine what it is.