UPDATE: It turns out that the fix I describe here wasn’t permanent and the TV stopped working again. I thought it would still be useful to show what I’ve done:
I have a SVA HD4208TIII-PDP plasma TV that was bought about 4 years ago. All of sudden last week it refuses to switch on. When you try to turn it on with the remote, the red power light would go off, as normal, and then you would hear a bunch of clicking sounds, but nothing after that. To try again, I would have to switch off the TV using the power button on the right side of the TV, but regardless of the number of times I try, I just wouldn’t come on.
After some research, this seems to be a common problem with this model. Some people claim to be able to get it to work after several attempts, but the next time they switch off it wouldn’t come on again. Some also claim to get it work if they unplug the TV for several hours or days, but I tried that it still wouldn’t work.
I did some more research and found it that it is a problem with the power board. You can buy a replacement for $350, but seeing that a new plasma TV can be had for about $700, it doesn’t seem worth it. Also, I would hate to buy a new power borad and find that the problem is something else. I saw one post where some did buy the power borad and the TV worked for a few months and then stopped working again. If anyone is interested, you can buy the power boards here: http://www.shopsva.com/hdpobo.html
I found a post where some identified three components that can be replaced to solve the issue:
I figured that this would be a cheap way to try and fix the TV and if it doesn’t work, I wouldn’t have wasted too much money. The rest of the article describes the process of replacing these components.
Please note that this involves desoldering and resolding the components. If you attempt this, you do so at your own risk!!!
My first task was to open up the TV and get the part numbers. Be careful when you do this as the screws that are on the back actually hold the front screen in place. I laid the TV flat on a bed with the face down. After opening up the back and removing the brace that holds the stand, you need to identify the power board. Here is a picture showing the power board:
When you remove the board, take note of all connectors. I used the above picture to help me reattache the cables. Here is a view of the borad showing the location of the relays and the transistor. The transistor is attached to a heatsink so that is all you can actually see in this view:
Here is a closer view of the components and you can actually see the tarnsistor:
The part numbers are as follows:
- Relays: JW1AFSN-DC5V
- Transistor: TOP224Y
The next challenge was to find the parts to buy. A lot of places wanted you to buy them in quantities of 100. I eventually managed to find the relays from a company called DigiKey. Each relay was $2.11. If you need it, their part number is 255-1725-ND. Here is a direct link to the part
The transistor was harder to find, but I managed to find a seller on Ebay selling 4 for $10.75 including shipping.
The relays came first so I decided to try them and see if that solved the problem. I unsoldered the original relays and soldered in the new ones. I then tried the TV and lo and behond, it started to work again.
The transistors will come later this week, but I wouldn’t bother to replace it unless the TV stops working again. I also plan to buy a few spare relays so I can do the same repair in the future if necessary.
I hope this information is useful to others in the same situation. It feels great fxing a 42″ plasma TV for just $5.00 is parts, especially when you consider the alternative was to buy a whole new poer board for $350.00
I actually did buy a replacement 42″ plasma for the family room, but now that this one is repaired, my wife and I now and a plasma in our bedroom
Photo showing capacitors C8007, C8008, C8016, and C8017