Question about Panasonic PT-53TW53 53" Rear Projection HDTV-Ready Television
My T.V. cuts on sometimes and when it does it may stay on for a few mins. then cuts back off. I have noticed that when it cuts off the power button blinks about five times then turns off. I had some water damage in my basement and when I had it looked at it wouldn't even come on. They said that it needed a PS/SWEEP BD. Then I took the back off a noticed a125v 6.3A fuse and took it out and put it back in and then the T.V. started working for a few mins. then cuts off. Is there something that I could do or do I just need to replace the fuse or do I need a new board and if so is it something I can do or do I just have some moisture in the back of it. Its a panasonic projection model #PT56WX53(56inch). Can you help me.
Let me start off by explaining what is happening. You have a component that has become thermally sensitive meaning that as the component heats up it begins to malfunction. This sometimes happens as the result of a catastrophic event to the TV such as powering it up after a foreign substance has been put on the circuit board and a short has occurred. Now the swapping out of the Power Supply/Sweep board is the quick and fast thing to do (the only option given by "TV Repair" shops these days, sad but true) it is not the only option that is possible, but you are going to have to do some looking for a shop that does component level troubleshooting. There are some things you can do, but I would suggest that you have a qualified TV repair person work on your set because of the dangerous voltages that are present in the sections you will be working in if you try to do this yourself.
Ok first dry out the set using a hair dryer on high to do this, and don't have the set plugged in.
Wait for a day or two after drying out the set to plug it back in.
Turn on the set and wait for it to cut off.
When it cuts off notice if you heard a clicking sound prior to it cutting off.
If you hear this clicking sound this means that the shutdown circuit senses an over-current condition and is shutting down the TV.
Once you have determined this you will have to have these following items.
1) a schematic
2) a multimeter
3) a flashlight
4) an isolation transformer
5) an oscilloscope
6) a High Voltage probe (both 1000v and 40Kv type)
7) freeze spray
8) heat gun or hair dryer
These items will help you in troubleshooting this problem. If you do not know what these items are, I would not advise you working on this set yourself and the option of getting a shop that does component level service is the best option for you.
How ever if you want to do this yourself get these items and I'll be glad to walk you through the process.
This are the first things you must do:
Plug the TV into the isolation transformer and the isolation transformer into the power outlet on the wall.
Turn on the isolation transformer and set the voltage to about 90Vac (not 110Vac or 120Vac).
Examine if the set turns off or not over time (if it does this will give you a window in which you must use the schematic and your other equipment to find the area that is causing the problem (this will take some time and some knowledege).
After you find the area you then will use the freeze spray and heat gun to stress the components in that area, the heat gun should speed up the shut down process, and the freeze spray should make the on time increase, this allows you to narrow down the area to a single component or components.
This is the basis of what you must do if you plan on doing this yourself.
I wish you well,
Posted on Oct 28, 2007
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