The power led may be flashing a code you can google.
My Panny will flash the power LED when there is a problem. Well, for many problems anyway. Observe the sequence like 7 and 3. I do not know if the Toshiba has that feature. If not, the issue is most likely power, HOWEVER, any board could be at fault since it powers up then shuts down. An excessive load on another board could be shutting it down. A fault on the PS board itself could also be shutting it down.
Testimonial: "what do you mean? Where is the code?"
SOURCE: motherboard
I have one sitting in front of me , unfortunately I cannot get it to you but will be happy to tell you the positions. It's not very difficult to fix and I will stick by until you get it correct. I hope I don't complicate this in an attempt to keep it clear and don't be insulted by my answer. I am guessing you don't have a great deal of experience working inside the box and it can become confusing. This is much easier than the length of this answer suggest. You will do this in about 30 seconds, move anything that is in you way and make a note of where it came from. If your hand is small you are lucky but don't force anything and if you are pushing on anything trying to get down there see what it is before pushing more. Better to move it.
There is a front panel connector that is on the bottom right of the board if you orientate the board by placing the computer access panel in front of you with the front of the computer facing to your right. Then right below the floppy disk controlled socket (the smallest flat cable in the box) if no floppy the empty socket below the battery.
There is a double row of pins, looks like 2 rows of 10 pins each. Mine are multicolored, pink and green etc. and the should be marked + and minus, at least plus. The number 1 pin is on the left. The 1 pin is actually the bottom left and the 2 pin is above it. Back down to the bottom row and pin 3 is right next to 1 and the 4 pin right above it. Pin 3 is the second pin on bottom left. Follow the way it goes? The bottom is 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 and right above 2, 4, 6, 8, 10, 12, 14, 16, 18, 20.
Pin 2 is + so put your Power SW on pin 2 and 4 with the colored wire on pin 2. Colored wire in the pair should be positive, and it can be blue, red, green, mine is red and white.
The Power LED goes right next to the Power SW on pins 6 and 8, the colored wire on pin 6, mine is blue and white. And finally the HDD LED goes on pin 7 and 9. All counting from the left to right. My pins are not marked as I think its not critical how the LED is connected and if it does not light then reverse those 2 pins. My colored wire is on pin 7 and its blue. May as well finish, the Reset button is wired to pins 17 and 19 with 17 being positive and the speaker if you have one hooked up (your tiny internal speaker not for listening to music) is a 4 pin connector with the middle 2 sockets empty and fits over the last 4 pin s on the bottom right. 13, 15, 17, and 19. Pin 13 is +. There may be other wires but I don't know where they go depends on what they are but this is what you need. Good luck. And make sure all is unplugged and touch the box to ground yourself or wear a strap. Look but don't touch is a good rule for now.
SOURCE: Power problem
OMG!! I had the exact same problem! I unplugged the TV to paint and it stopped working with a flashing green button. I ran my fingers along the bottom of the screen and it actually worked.. wow THANKS A TON!!!
SOURCE: Power Up Problem
You have a 8.6v supply error according to the 7 error code being displayed, what you can try is when the set goes to blinking disconnect the Y sustain board (if looking at the tv from the back the board on the left) from the upper left side of the power supply, if the error code stops then you know your Y sustain board is pulling down your power supply and causing the error, if the error code continues you have a probelm with your Logic Board (located under your Small Signal Board) disconnect this from the Y sustain board and see if the error code stops if it does you know that the Logic board is bad, if the error code is still blinking then the 8.6v supply line from the Power supply is faulty and the Power Supply needs to be replaced
SOURCE: Power Up Problems
7 blink error is 8.6 volt error on that model. usually tied to y sustain board located on left side of set looking from back. disconnect y main from power supply and power on and if comes on verify power supply primary voltages located on label on pdp itself. if voltages present you would need to replace that board as not designed for component level repair. however if you find failed components like swollen caps or burnt ic's you could replace those. also when replacing the y main board there are two y buffer boards to left of main board that also would be recommended to be replaced at same time as they work as circuit and replacing one board without other could cause failure to other boards still in set
SOURCE: TV "X-Ray" Error
I have a JVC K-series TV (AV 21KT I think is the model number). For no
apparent reason it stopped working two days ago. I have had this TV for
about 5 years plus. When I switch it on, the picture appears for about
3 seconds (the interlacing is really bad)... then in the centre of the
screen the text "X-ray" appears and the TV turns it'self off. Then the
"Off timer" LED (located next to the power LED) flashes. the only way
to turn it on again is to unplug the power and plug in again.
What is this "X-ray" error given. What causes it. (does the CRT need to be degaussed or something) Can it be fixed. Please help!
FRANCK I LIVE TO MADAGASCAR
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