I have discovered that the fuse on the circuit board as blown. I've jumperd it with a very tiny piece of wire wrap wire to see if the monitor would come back on and it does. I'm a bit uncomfortable with leaving it in this condition, but I have no way of knowing what amp fuse to put in it's place. The fuse is a soldered on surface mount type. Does anyone what amperage fuse should be placed here? The wall wart that powers the monitor is a 12V 5A unit.
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Hi All of the new HDTV sets these days use a switch mode power supply (SMPS) to delver the proper voltages to the associated circuits. If the set turns off on its own chances are its in the power supply area. Start by checking the connectors attached to the circuit board for physical signs damage on the circuit board. Possibly a blown fuse, open resistor etc. Hope this helps Bruce
Hello If the TV doesn't turn ON ata all, it is surely due to some fault with its power supply regulator section. You haven't given any otehr details of your tV, than it is only a 32 inch CRT Sylvanial Tv. No model number; so I only can provide you a solution in general. Check the ON-OFF switch for its contact. Normally, TVs uses DPST type switches [Double Pole Single Throw]. If any one contact amoung them have any problem with its internal contacts, the set won't switch ON. If the switch is OK, come towards the power regulator section circuit board, and check whether the fuse has blown out or not. If it has blown out, replace it with same type and ampere rating. Never use higher ampere rating than specified. The ampere rating will be maiked either on the rims of the fuse, or at the printed circuit board, just under the fuse. After repalcing the fuse, switch ON the TV and see whether it works well or the replaced fuse blows up as soon as you switch ON the set. If the repalced switch burns out as soon as you switch ON the set, the power supply section has damaged [shorted components in it]; and should be replaced. Normally for LCD TVs it will be good to replace the power supply as card basis. This power regulator card can be bought from most of the electronic spare part shops at your town, orby the authorised service center for Sylvania at your town. If you may have given its model number, I could send you the picture of the power card of your TV. OK.
I'd guess that the surge damaged some resistors on the internal circuit board, possibly a capacitor. You may be lucky if this has an internal fuse, in which case the fuse may have blown, saving the main components. Best course of action is to take it to a TV repair shop or similar to have it checked out
There is a wire that runs to the connection of the impeller pump to the unit, my guess is that it is probably touching the side of the copper element and has melted. The other possibilities are that the tiny circuit board behind that connection has come off or the connector at the other end (near the main circuit board) has detached somehow. Hope this helps
if your circuit board has a 25 amp fuse that a lot of power, like running the compressor.. you need to have a model and serial number for the unit , there is no generic control board , each manufacture has it's own design
I just fixed my proview 3200 that doesn't have picture but with sound.
First, thanks for the tips I got from this forum. I checked the 24v from the power supply board and that's perfectly working fine. I then check the fuses in the Inverter board. There are 4 white fuses (2amp I guess, i cant remember) and 1 black fuse (1amp/76v just behind the wire connector going to the power supply board). The black fuse is the one that blown out on my tv. This fuse supplies power to the LM358A IC. I know its not right but I just solder a thin piece of wire to short circuit this fuse. I'm lazy to drive to RadioShack to find this fuse. :)
....and that worked beautifully. Check the picture attached for what I did.
I had the same problem, but i fixed it myself. It sounds like the fuse ( F2) is blown on the circuit board. Have you had the ds open at anytime ? if so ,did you put the black sponge/foam back in place between the touch screen and the circuit board? if not , this will blow the fuse. if you look at the circuit board just past midway top right there is two small silver dots. ( F2 ). this should have a very thin piece of fuse wire linking them both, if not then the fuse has blown. Solder a piece of solder and "arch it" and drag from one dot to the other so it forms a link. Try it , it worked a treat on mine . Let me know if it works