component testing

[junebug1]

I have a probably stupid to the electronic gods n gurus pertaining to component testing I know certain components must be removed from the board for testing to get accurate readings, but I will be testing a TMS94481CT transformer and am wondering if I can test while still connected in board?

[budm]

Re: component testing

Are you talking about the Current Sensing Transformer? It more likely to have burden resistor connected in parallel.

[budm]

Re: component testing

OK, it is inverter transformer with two high voltage windings, you can do the comparison reading of the high voltage resistance first.
Here are the pinouts:
http://lcdparts.net/TransformerDetai...ProductID=4010

[junebug1]

Re: component testing

yes, everything I have read from others symptoms, this transformer is probably my problem. I was curious to know if it can be tested while connected in board or do I need to desolder it and then test?

[junebug1]

Re: component testing

I have a dynex DX22LD150ALL led TV that was working fine last night, watching DVD when screen went black. hear sound just fine, shine a led flashlight at it, can see pic. please wait message flashes on screen at startup, then screen goes black. All searches leaned more to the transformer having gone bad, not so much the backlight bulbs and all logical responses found came from this site

[budm]

Re: component testing

LED backlights TV does not use high voltage transformer like the one with CFFL. Common failure in LED backlights TV are due to bad LEDs.
I already gave you the link for the pinout of the inverter transformer, you can check the secondary side DC resistance to see if they are within 3% of each other, it also may not be the transformer.

[junebug1]

Re: component testing

LOL...Aawwww, I had my hopes up to b simple!! Yes, thank-you, i understand it could b the bulbs, the board, etc. and thanks for all the links...the info is informative and great!!