Picture goes in and out after 20 minutes of air time
My picture is fine for about 20 minutes then it looses all picture for 3 to 5 minutes then resumes picture for another 10 or 15 min. then it goes out again. The tv shop tells me it's a digital board but the part is not available, when I opened up the back, it doesn't even look like the theife opened and looked for himself. I already blew out the color wheel and the fan is operating, unfortunetly the problem did not occur whilr the back was off so I dont know if the bulb is going on and off. Any help from the experts is appreciated. The same thing happens with our t.v. it will work fine for about 45 minutes with dvd, xbox, etc.. and a couple of hours with cable. Then the picture just cuts out and starts flashing different colors. The TV Ch 3 will stay on and green and the sound is still good, the damn picture just goes out. its annoying. Help please!
Televison & Video - Vivitek - V37655 56" DLP TV
Answers & Comments
Welcome to overheating problems
buy a can of component cooler at radio shack then while the tv is on and, not working with the back off; spray the circuit board parts until the problem goes away then install a small 12v computer fan to blow air over the offending overheated chip etc. the cooler is only freon and, will not cause a spark it is safe to use on live circuits
OK; the circuit board I'm talking about is the one that the power plug goes into that is the power supply
what most people do (after the waranty runs out) is add a computer fan to **** out the hot air thats causing the chips to fail
I suggested the coolant spray because it does not require expensive tools like oscilloscopes, multimeters etc.
the manufactures know that they need bigger thicker TV cabinets but, the public want slim cabinets
Radio Shack personell do not know much of anything I'm sorry to say...sorry you're so frustrated
Kassandra,
The following I posted several times today and it looks to me that we all have potentially the same problem.
I had a similar problem.
My TV started to flicker and I put a new bulb in. The new bulb did not help, even if it is good to replace after a couple thousand hours.
I found out that my heat sink, which is sitting on the CPU with the mirrors came loose and the unit overheated and shut off after flickering a while.
Try to take the lower back panel off and you see a heat sink which is sitting in the center of a aluminum sheet metal piece. Disconnect the wires which are attached to the circuit board behind the sheet metal. Then take off the screws holding the sheet metal and pull it gently off. It will take a little force, but it does not damage anything. Now you see the heat sink on the circuit board held by a latch going across the heat sink.
On the upper right corner you will find the handle to open the latch. Once you did it , you can take the heat sink off and see the main CPU (as I took the latch off, my heat sink fell off).
On my heat sink the Heat Sink Compound Paste creating the connection between the CPU and the heat sink dried out and became brittle, son there was no connection anymore and the heat couldn’t be transported out through the heat sink, which is cooled by a fan on the left.
I took the brittle Heat Sink Compound Paste off and applied a generous portion of the one that I bought at Radio Shack. I used a Silicone-Base Heat Sink Compound which ran $4.99 excl. tax.
After applying the paste put the heat sink gently in and when you do, you will feel like a suction indicating that you have a connection between the CPU and the heat sink.
Now you need to put all parts back together.
If you are not familiar with electronics and those wires or wouldn’t hurt or would be wise to mark the connectors and to make pictures before removing them. This will save you a lot of frustration.
I hope this helps you and brings your TV back to life. My TV was cutting out after 25 minutes and runs now like a charm.
Good luck.
PS: If you experience a black screen with vertical stripes (mine were white and green) then most likely the light engine needs to be replaced, I had this after 9 months and got it fixed under warranty