Riddled TV Repair Forum

BladedRotary · Joined: 23 Feb 2017 Posts: 2

This is a Samsung LNT4061fx/XAA, it's an older model (10+ years) that has had problems before. A previous problem was common with this model (colored lines, not turning on) and that was faulty capacitors that I have replaced. This time, there's a snowy static that flickers on the screen after the TV has been on for a few minutes. It will also hiccup to a black screen for a few seconds, interrupting the audio as well. I have provided a video to show exactly what this TV is doing, but unfortunately I was not able to capture the black hiccup. I swear the thing knew every time I was recording. Any help would be greatly appreciated.

https://my.mixtape.moe/mmmyyp.mp4

Google

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

I believe this is one of those models with the defective power factor correction circuit on the power supply board. There's lots of info on the 'net that shows how to disable that portion of the power supply, and make your set operable without it.

The correct way to fix this is to replace a few resistors in the PFC feedback circuit.

BladedRotary · Joined: 23 Feb 2017 Posts: 2

Thanks a lot for the info kuhurdler, that really is too specific for me to figure out on my own. I have been googling around for an hour now and unfortunately I haven't been able to find the information on bypassing that portion of the power supply you mentioned. I hate to ask to be spoon-fed, but would you link me that info?

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

Here's a low quality youtube video of it: https://www.youtube.com/watch?v=i-jQZ-TQdgU
it looks like the model number is a little different than yours, but appears to be the same symptom.

It would also be worth checking the capacitors on your power supply.