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Re: lg diagram tv 29fu1rl
Check all the capacitors used at its horizontal output section circuit. If transistor leaks frequently, surely there will be some defective capacitors or any other fault. Check the output voltage comes out of the SMPS too. If this voltage is more than normal, this kind of fault can occur. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
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The TV has two power supplies, low and high voltage. Most likely the high voltage transistor (called a Horizontal Output Transistor or HOT) is shorted due to a malfunctioning high voltage transformer (the biggest piece on the board with the large red wire coming from it. If the low voltage is bad most likely the diode pack (full wave rectifier) or the voltage regulator chip.
Remember fuses are to keep the unit from catching fire by opening up when a short circuit draws too much current. If you cannot replace the cause of the current draw, it's time to buy a new TV.
Check the Hori output Transistor and the small blue capaciotr that feeds transistor (2k) volts sometimes cap has small burt hole in them causing lost of high voltage.
Another thing if these 2 parts are bad and after you replace them and TV still does not come on then replace Bopth STK ICs they are big black ICs and will have PN# on them example STK392-110. For Parts Cal Mats 1-800-628-1118
hi first of all u should check ur transistor connections.Check your Horizontal and vertical output transistors.You should also check the horizontal and vertical yoke connections as well as your low voltage regulators.... if any of these got damaged u should purchase a new one.. but try to purchase with the help of a tv service assistant... thank u!!! rate me
You have a shutdown circuit. The shutdown circuit is working as it should by not allowing the TV to come on if it has a HV (high voltage) problem. This could be caused by a shorted HV Transistor in the Horizontal section or a defective IHVT (Integrated High Voltage Transformer). In any case you will have to get a qualified TV repair person to troubleshoot and repair this problem.
I fixed the problem with the "no power on, low clicking noise". The NPN transistor (2SC5931) was shorted. This transistor controls the horizontal hold. The shorting caused the power supply to overload and restart, then recycle. This was the cause of the clicking noise. Unfortunately this transistor was over $50, most likely due to the extinction of CRT's. I did find a replacement transistor 2SC5552, which only cost $2 (but I was able to get it in Mexico). The location of the transistor is located on the left side of the TV (looking from the back). Directly in front of it is the high voltage transformer which powers the CRT (should have a thick red wire). The transistor is attached to a large aluminum heatsink. To remove the transistor you will have to remove the entire electronics assembly to you can easily get to the underside. This was the solution for my TV, but there could be other components damaged.
Most likely the transistor will be on the main board. It will also be mounted to a heatsink. The board you see mounted to the rear of the CRT is not associated with the horizontal and high voltage. Follow the high voltage wire attatched to the side of the CRT back to the flyback transformer. You should find the transistor near the transformer.
As for swapping them out: you can swap them out if both TV's are the same model number or if the transistors have the same part number. If not, I would not do it. You have to make sure that the specifications of the parts are identical otherwise you can damage the replacement part and possibly the TV.
Let me know if I can be of further assistance to you.
Your set might not be producing the high voltage it needs to light up the screen , it might be missing the supply voltage the supply volts to the output transistor ,if this voltage is missing is because the transistor is likely bad(shorted) and it has opened a fuse or a safety resistor.If you are familiar with tv service you have a place to check but you are not too familiar be safe and call a professional,high volts circuits are dangerous.