I recently purchased a the TV in the subject knowing it had an issue. I thought it was the IC convergence chips but found out tonight it wasn't. The problem seems to be within the red circuitry/gun. As the set works fine if the circuit card on the red yoke is pulled off. Leave it on and all you get is a red screen with vertical white concave lines for approximately 10 seconds and then the set goes into protection mode.
Sir well if you purachased the tv recently and if any problem is there then you must use your warranty period oderwise if you will do something then it might work against you getting new tv so sir go for the warranty its the best option right now ,i will try and help you if this doesnt work!!
The problem is with the circuit board, there has to be a short somewhere either in the connection to the circuit board or the board itself. The only reason the tv would go into protection is dur to an overheat on the board. My guess is if you replace the red circuit board you fix your problem.
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Re: Toshiba TP55F81 going into protection mode
Since you have recently purchased that TV... It is best to return it have it changed with a new one... It has still a warranty, right? So why give yourself a problem... It is your right as a customer to get satisfied with what was bought. Remember you pay them for that... Exercise your right!
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The colors seperating is a convergence problem, as far as being dim this may be related but the TV likely needs service adjustments. convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually $200-$400 Be sure to vote/rate me if this helped Thanks! See link for more detail http://www.ehow.com/how_4575598_yourself-projection-tv-repair-convergence.html
the vertical deflection IC if defective will cause the protection circut not to let the tv power up ,it has a thermal protection circut as well here is the vertical deflection IC # la78045 and here is a link for the NTE equivalent part and specifications and pin layout http://www.nteinc.com/specs/7200to7299/pdf/nte7209.pdf WARNING if you heat up any component to long or with to hot of an iron you can dammage the component and or the thermal protection circut but I believe you will also have to replace the flyback (high voltage transformer ) with wire giving to much voltage
Does the blue and red crosses move at all ... eather vertically or horizontally. if they move at all then it may not be the chips.. could be a resistor. if the crosses dont move then it probally the ic. these chips run about 7 to 45 dollars apeace depending on type. at our shop we charge around 125 to put in.
did you change the resisters the same time as the ic? some have reported that they got generic IC (cheaper) and have failed. http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220 http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
It is a good possibility you damaged something on that PCB that had the IC's, I like to use an upgraded chip the STK394-160e that is designed for HD signal stresses. I dont know why they ordered the convergence board but I suspect it would have been ok, there are also 2 jumpers that need soldering JW10 and JW50 that supply power to the chips and they REQUIRE resoldering or it will fail again. Might try reseating the RED CRT board, check for cables that you may have unhooked to see if they are not seated in their sockets properly, double check every wire you unhooked, Make sure you used a Silicone Heatsink Compound on to the back of the IC's. I dont know what all you unhooked, but check the wires going between the CRT Boards. Check for cracks in the boards to make sure they werent flexed to much. Good Luck.