Insignia NS-32LCD (clarification on other post's solutions)

[tpatterson4430]

I have read every post on the internet about the Insignia tv's having no picture but having sound issues. I just need some clarification on exactly which solution to try because I think I overloaded myself with all the information I found.

Ok, my problem is that my Insignia NS-32LCD tv started having problems turning on. It would turn on and have sound but it would take any where from a couple seconds to minutes for the picture to come on. Now the picture won't come on at all. I do a little schooling behind me in electronics so I automatically assumed bad capacitors. I opened it up and didn't see any blown capacitors but three that may be bulging. (Marked on first picture with yellow arrows) I unplugged all output connections and tested them with the tv on and I got 4.8V on the third output. The first two ring out but show 0V. There is also a brown area on the board that I outlined on picture 2 . Both FU502 and FU503 ring out and show no signs of physical damage. I've never had to troubleshoot a power supply much less a tv. Most of my experience is in building wiring harnesses and working on computers. I think if I am directed in the right direction I can repair this board. Since this is the first time I've worked with high voltages I want to talk with others that are old pro's at these type of problem's. I've attached pictures of all three boards. I would appreciate any and all help.

[retiredcaps]

Re: Insignia NS-32LCD (clarification on other post's solutions)

I opened it up and didn't see any blown capacitors but three that may be bulging.

Good thing you attached pictures because those caps are definitely bloated and bad.

You might also have two in your last picture, but because of the glare/photo I can't tell 100% (circled in red).

My standard answer for replacing caps is below (regulars may skip)

https://www.badcaps.net/forum/showpo...84&postcount=3

[retiredcaps]

Re: Insignia NS-32LCD (clarification on other post's solutions)

Since this is the first time I've worked with high voltages I want to talk with others that are old pro's at these type of problem's.

The high voltage or hot side is where the large filter cap is. Everything inside the black dotted line is "hot".

Before soldering, take your multimeter and measure the DC voltage across the large filter cap to ensure the large filter is discharged. If it is reading close to 0.0V, you are okay. If it is reading 165V DC, you have to discharge it first. Most, but not all, modern TVs discharge the large filter cap as soon as power is removed and unplugged from the AC outlet in a few minutes.

[retiredcaps]

Re: Insignia NS-32LCD (clarification on other post's solutions)

BTW, Dave Jones at eevblog.com just posted a video that is relevant to your situation. 15 minutes at

http://www.youtube.com/watch?v=Ytw57212X2o

[Mr Bill]

Re: Insignia NS-32LCD (clarification on other post's solutions)

I Agree with two caps on the main board (pic 3) being bloated. Definitely the top one of the two.

[tpatterson4430]

Re: Insignia NS-32LCD (clarification on other post's solutions)

Thank you for responding. I'll take a closer look at the last board. I didn't pay too much attention to it. All my focus has been on the power supply. I figured I needed to replace the three capacitors. Do you think I should go ahead and replace all capacitors on the power board while I'm replacing the three? I read a little about discharging a capacitor but when doing it with a resistor does it matter which side I touch first. (positive side or negative side)?

[tpatterson4430]

Re: Insignia NS-32LCD (clarification on other post's solutions)

Also as far as the replacement capacitors I know to get a better quality manufacturer, keep the same farads, but do I keep the same voltage as well?

[retiredcaps]

Re: Insignia NS-32LCD (clarification on other post's solutions)

Answers to your cap questions in post #6 and #7 already pre-answered in post 2 if you read my standard answer.

It doesn't matter which side of the resistor you connect to discharge the large cap. I use a 100k ohm resistor if the large filter cap is still charged.

[tpatterson4430]

Re: Insignia NS-32LCD (clarification on other post's solutions)

Ok, sorry I saw the link but kept reading, then replyed forgetting about the link. I appreciate your help. I watched the video and now feel a little more comfortable about fixing this board.

[t2good4u]

Re: Insignia NS-32LCD (clarification on other post's solutions)

I have read every post on the internet about the Insignia tv's having no picture but having sound issues. I just need some clarification on exactly which solution to try because I think I overloaded myself with all the information I found.

Ok, my problem is that my Insignia NS-32LCD tv started having problems turning on. It would turn on and have sound but it would take any where from a couple seconds to minutes for the picture to come on. Now the picture won't come on at all. I do a little schooling behind me in electronics so I automatically assumed bad capacitors. I opened it up and didn't see any blown capacitors but three that may be bulging. (Marked on first picture with yellow arrows) I unplugged all output connections and tested them with the tv on and I got 4.8V on the third output. The first two ring out but show 0V. There is also a brown area on the board that I outlined on picture 2 . Both FU502 and FU503 ring out and show no signs of physical damage. I've never had to troubleshoot a power supply much less a tv. Most of my experience is in building wiring harnesses and working on computers. I think if I am directed in the right direction I can repair this board. Since this is the first time I've worked with high voltages I want to talk with others that are old pro's at these type of problem's. I've attached pictures of all three boards. I would appreciate any and all help.

Can you tell me the information on the FU503 that fuse on my board is burnt and i need to replace it. but i have no way of knowing what kind to get because all the information is burnt off of it.