Help - how to test an inverter transformer

[matthmal]

Hi Guys,

I have been wondering how could I learn to test Inverter transformers and any other sort of transformers. I have been googling around and tried to understand the below webpage:
http://www.jestineyong.com/test-lcd-...r-transformer/

Can anyone please assist and teach me how to test them please?

Thanks,
Matt

[stj]

Re: Help - how to test an inverter transformer

http://members.ozemail.com.au/~bobpar/fbt.htm
i use this to test transformers.
the pdf has the schematics to make one.

[keeney123]

Re: Help - how to test an inverter transformer

What do you not understand?

[matthmal]

Re: Help - how to test an inverter transformer

http://members.ozemail.com.au/~bobpar/fbt.htm
i use this to test transformers.
the pdf has the schematics to make one.

Not sure how could i do that.... is the below similar?
http://www.ebay.co.uk/itm/Philips-Fl...item3f4a76b42b

[matthmal]

Re: Help - how to test an inverter transformer

What do you not understand?

Can't really understand how to test it and what should be the results.... I understood that an ohm test should take place but i do not know what should the results be and which joints should i test

[stj]

Re: Help - how to test an inverter transformer

Not sure how could i do that.... is the below similar?
http://www.ebay.co.uk/itm/Philips-Fl...item3f4a76b42b

nothing to do with it.

[budm]

Re: Help - how to test an inverter transformer

Can't really understand how to test it and what should be the results.... I understood that an ohm test should take place but i do not know what should the results be and which joints should i test

To do the Ohms test, you will need to get the P/N to find the pinout, you can go to LCDPARTS.NET to see if the transformer you are trying to test is on the site, for example:
http://lcdparts.net/T.aspx
Just hit the buy now and the transformer spec will come up.
http://lcdparts.net/TransformerDetai...ProductID=2732

You can also remove the transformer to see how the windings are arrange.
If you have more than one transformer on the board then you can compare the resistance reading. When you work on many of them you will know how the transformer windings are arranged.
BTW, are you asking about inverter transformer for LCD TV or Flyback transformer for CRT.

[matthmal]

Re: Help - how to test an inverter transformer

To do the Ohms test, you will need to get the P/N to find the pinout, you can go to LCDPARTS.NET to see if the transformer you are trying to test is on the site, for example:
http://lcdparts.net/T.aspx
Just hit the buy now and the transformer spec will come up.
http://lcdparts.net/TransformerDetai...ProductID=2732

You can also remove the transformer to see how the windings are arrange.
If you have more than one transformer on the board then you can compare the resistance reading. When you work on many of them you will know how the transformer windings are arranged.
BTW, are you asking about inverter transformer for LCD TV or Flyback transformer for CRT.

Thanks will try it out and will let you know.

May I ask you what you think of this:
http://www.ebay.co.uk/itm/AnaTek-Blu...item2a2ea6e1dd

I am asking about LCD and any other sort of transformer which you can find in a monitor, tv and electronic devices.

[budm]

Re: Help - how to test an inverter transformer

I never use one of those, I use my SENCORE LC75.
http://www.ebay.co.uk/itm/Sencore-LC...item2358eeb120

[matthmal]

Re: Help - how to test an inverter transformer

I never use one of those, I use my SENCORE LC75.
http://www.ebay.co.uk/itm/Sencore-LC...item2358eeb120

That is surely much better but even more expensive. So the one that i quoted isn't good?

[stj]

Re: Help - how to test an inverter transformer

each tool has it's own purpose.

the blue ringer is just for testing coils / transformers.

an LC(R??) meter is also for checking capacitors - it also gives real numbers instead of just a bar of leds.

you get what you pay for.

[matthmal]

Re: Help - how to test an inverter transformer

each tool has it's own purpose.

the blue ringer is just for testing coils / transformers.

an LC(R??) meter is also for checking capacitors - it also gives real numbers instead of just a bar of leds.

you get what you pay for.

May i know which is the secondary and primary windings of an inverter transformer pls? Which is the winding that I am supposed to check?

[stj]

Re: Help - how to test an inverter transformer

check both.

the primary is the one the power goes into and usually looks smaller if you can see it.
the secondary is the output to the tube(s)

most problems are on the secondary side,
but it's worth checking there is no conection between the primary and secondary.

[budm]

Re: Help - how to test an inverter transformer

Go here and look at the transformers to see what typical windings for the inverter transformers are (the secondary side high Voltage )winding will use very small wires compared to the primary winding).
http://lcdparts.net/T.aspx
Click on the 'BUY NOW' button to see the spec and the pinouts.
For example:
http://lcdparts.net/TransformerDetai...ProductID=2727

[fzabkar]

Re: Help - how to test an inverter transformer

Go here and look at the transformers to see what typical windings for the inverter transformers are (the secondary side high Voltage )winding will use very small wires compared to the primary winding).
http://lcdparts.net/T.aspx
Click on the 'BUY NOW' button to see the spec and the pinouts.
For example:
http://lcdparts.net/TransformerDetai...ProductID=2727

Thanks for the information.

I notice that LCDparts want $22 for the transformer alone, whereas shopjimmy are selling an entire 4H.V0708.321 inverter (which uses 6 of those transformers) for $10.

http://www.shopjimmy.com/auo-19-2600...t-inverter.htm

[budm]

Re: Help - how to test an inverter transformer

I only use LCDPARTS.NET for ref info only (I used to buy from them because they are close by in S.F), their prices are way too high.

[matthmal]

Re: Help - how to test an inverter transformer

Go here and look at the transformers to see what typical windings for the inverter transformers are (the secondary side high Voltage )winding will use very small wires compared to the primary winding).
http://lcdparts.net/T.aspx
Click on the 'BUY NOW' button to see the spec and the pinouts.
For example:
http://lcdparts.net/TransformerDetai...ProductID=2727

Hi,

Thanks for your reply. I can't seem to find the transformers that I want on that website though. Can I do something else please?

Thanks,
Matt

[budm]

Re: Help - how to test an inverter transformer

Hi,

Thanks for your reply. I can't seem to find the transformers that I want on that website though. Can I do something else please?

Thanks,
Matt

But so far you have not given us any information or the pictures of the transformer you are trying get or test. You gave the link in post 4 for the Flyback transformer for the CRT.

[matthmal]

Re: Help - how to test an inverter transformer

check both.

the primary is the one the power goes into and usually looks smaller if you can see it.
the secondary is the output to the tube(s)

most problems are on the secondary side,
but it's worth checking there is no conection between the primary and secondary.

Hi,

Thanks for your reply. I came through the attached... is that the way that the windings need to be checked?


Thanks,
Matt

[budm]

Re: Help - how to test an inverter transformer

How about the pictures of the top side of the board? and also the whole board both sides.
What is the make and model of this product you are working on? The more information we get the more we can help.
It looks to be correct as you have marked for the High Voltage secondary winding.