跳转到主内容

Repair guides and support for your Samsung TV.

1531 个问题 查看全部

Picture cycling on and off plasma 50"

I have a Samsung 50" plasma model PN50B550T2FXZA that a couple months ago would turn off randomly and then come back on. It started doing it just on the coax source and would be very infrequently. Now it is happening           constantly and on all sources. It will come on with a picture and everything and then shut off within a minute and turn back on and will just keep doing this cycle continuously. I checked and it doesn't look like it has any bad capacitors. However, the back of the main board has some odd discoloration to it, it looks like dried soda and the power supply board looks like some of the leads have corrosion. I’m not an expert and I’m not sure of the next step to be looking at and just looking for some ideas.

Block Image

Y buffer and Y main

Block Image

main board

Block Image

power supply

Block Image

Back of power supply. Looks like corrosion to me. My question is this fixable or should I just get a new board?

已回答! View the answer 我也有这个问题

这是一个好问题吗?

按维修分数 0

评论:

@mlavallee

post some good images of your boards with your question. that way we can see what yuo see. Use this guide 在已经存在的问题里加入图片 for that. What you are describing could be from a leaky capacitor but it could also be stuff that is applied when the PCB's get build.

What I saw was on the back of the power supply and the main board but I just had it plugged in so I'll give it a bit and take them out and take a pic of the back. Also, turning the picture settings to "standard" seems to keep the cycling on and off to a minimum.

Just incase anybody else comes across this post with this problem I wanted to followup on this post. It was the corrosion on the back of the power supply board that caused the TV to shut off and on. Replacing the board fixed the issue completely.

Tried so many fixes over the last few months. Problem kept getting progressively worse. Randomly going into on/off cycle. In my case all it took was unplugging cleaning off and re-plugging the power supply. I had cut the power from the power strip and wall multiple times but did not fully do the job of unplugging and cleaning directly from back of the tv. stupidly I kept thinking "it has power" and was trying to determine the other patterns that were triggering the on/off cycle (ie. every time I used the remote)

添加一条评论

2个回答

已选择的解决方案

@mlavallee

if the last image is the back side of your power supply, it looks pretty damaged. May be a clearer picture would shed more light on it. I would replace the complete board.

这个答案有帮助吗?

按维修分数 1
添加一条评论

Try replacing the capacitors on the board. Plasma TVs are known to go bad because of old, leaking capacitors.

这个答案有帮助吗?

按维修分数 0

评论:

All capacitors? Because none appear to be bulging.

添加一条评论

添加你的答案

mlavallee 将永远感激不已
浏览统计数据:

过去的24小时: 0

过去的7天: 3

过去的30天: 13

总计 144