coby led4626

[slickrickybobby89]

I need help identifying a part for replacement, the mainboard i have has a burned component, unidentifiable markings incidentally, i have found a pretty clear image of the component but cannot find any information about it, can someone identify this part? Its in location qa6.

[CapLeaker]

Re: coby led4626

Looks like a mosfet to me for the panel-VCC used as a switch. Maybe a P channel Mosfet. Something like a AO3407. https://cdn.badcaps-static.com/pdfs/...b1f6ab665c.pdf Not that I am saying it is that exact replacement for it, as I can't read either what the picture is saying. But if push comes to shove, this is better than nothing.
I wonder if your panel is shorted?

[budm]

Re: coby led4626

QA6?
Do you have 12V at either end of the Inductor L60?
That device has to be able to handle at least 5A or more. You can look up the spec sheet of the LCD panel to find out what the inrush and the running current of the TCON is needed.
And as mention, you should check the fuse on the T-CON board and the resistance between GND and the output side of the fuse to see if there is shorted circuit there.

[slickrickybobby89]

Re: coby led4626

I do have 12v at both ends of l60 bud, and the tcon fuse is good, im not sure how to test a shorted panel capleaker? Ill post a pic of how the boards are layed out, i didn't have the tcon or led inverter board connected when i tested the main board.

[budm]

Re: coby led4626

Check the resistance between the chassis GND and either end of the T-CON fuse, notes: it may have active shorts that will not show up until the circuit is turned on.

[slickrickybobby89]

Re: coby led4626

The resistance is .1 ohms, when i test for a short with power off there is no short, when i test with power on it shows a short on both sides of the fuse. should i have everything hooked up when testing? The only thing not hooked up while testing is the panel, and the inverter board. I still havent identified the original burned part either.

[dick_barton]

Re: coby led4626

Don't test reisitance with power on. You'll damage your meter and possibly the circuits.

[budm]

Re: coby led4626

Man, people need to learn how to use test equipment properly before trying to work or fix something, otherwise we will get wrong information or the Operator may get hurt in the process.

[slickrickybobby89]

Re: coby led4626

Did i do sometging wrong here? I thought you wanted me to test the tcon board for short, specifcally with the power on.

[slickrickybobby89]

Re: coby led4626

I tested one side of the fuse at a time, and used one of the grounds on the board. I did not put my meter to both sides of the fuse and test restance while there was power. I use caution when working with live equipment or recently used electronics. If i did something incorrect, please point it out.

[CapLeaker]

Re: coby led4626

They did. While the TV is powered up, you only do voltage checks. Resistance, diode etc is only done with power off, the TV unplugged.