Phillips 42pfl3603d/f7 CLicking

[landen_michael77]

Hello, I have a Phillips 42 inch Lcd tv. As soon as i plug it into an outlet it begins clicking. I assume it is trying to cycle on and off. All 12v pins seem to have the correct voltage. right about 12. The one that I did notice that was wrong is the 3v3 st. As the power supply clicks the voltage fluctuates between 0.90v up to 1.5v. It changes almost every time it cycles (clicks) On the (off) cycle it drops all the way to zero and when its cycles on it never goes above 1.5v. It continues doing this as long as I leave it plugged in. I see no visible bad caps. I believe I have isolated the click to a little black box. I will add pic. Any info on where to check next. Thank you in advance.

[landen_michael77]

Re: Phillips 42pfl3603d/f7 CLicking

pictures

[budm]

Re: Phillips 42pfl3603d/f7 CLicking

Upload good clear pictures of the whole back side of the TV so we can see how many boards are used and how they are connected together, that will be a start.

[landen_michael77]

Re: Phillips 42pfl3603d/f7 CLicking

just uploaded pics. Internet is scketchy today.

[budm]

Re: Phillips 42pfl3603d/f7 CLicking

OK, for the 3.3VSTBY to be fluctuating, I will suspect either the start-up/running cap C104 (47uf 50VDC) is bad, or the caps in that area are bad, or the main board is drawing too much current.
You can try replacing the C104 first.
Pictures provided by ShopJimmy.

[landen_michael77]

Re: Phillips 42pfl3603d/f7 CLicking

I dont know if it matters, but when I unplug the white, and black cable from the power supply(going to the main board) it does not make the click any longer. I am going to change these caps now if I have them. Thank you

[landen_michael77]

Re: Phillips 42pfl3603d/f7 CLicking

looks like the cap reads 4.7 uf not 47. ????

[budm]

Re: Phillips 42pfl3603d/f7 CLicking

looks like the cap reads 4.7 uf not 47. ????

What is printed on the body? and are you sure it is C104?
Please note that the diagram I found may not be 100% match to your board after looking at and compared to the pictures of the board.
I am also trying to find out what C121 is for in your board.
See attached pictures of the suspected bad caps. You can try heating that section with hair dryer to see if the 3.3V will become stable or not.

[landen_michael77]

Re: Phillips 42pfl3603d/f7 CLicking

c104 is 4.7 changed it. Same thing. c102 is 47. changed it also. same thing. Im probably crazy but seems like the click is not as loud. Those were the only two I had on hand. I will have to order the others.

[budm]

Re: Phillips 42pfl3603d/f7 CLicking

What is the Voltage rating of the C104? Also see updated post 8.
Also check the resistance between the chassis and the 3.3V pin, TV is not plugged in of course.

[doc_brown]

Re: Phillips 42pfl3603d/f7 CLicking

I have the same model TV doing the same thing was this ever resolved?