I have a blown TV fuse but I'm not sure how to read the symbols on it or the type of fuse. It is white with metal ends and on one of the ends are the words and numbers: T4AH250V (with 3 circles after it). On the other end is a series of symbols with 50CT and the 3 circles again.
What do I need to ask for at the electronics store?
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Hello Chech whether AC power get into the power supply regulator section. Just open your tV, and check it. There is a fuse [ glass cartridge type] on the power supply section. Check whether it has blown up or not. If blown up, make sure that there is some shorted components at the power supply section check it.
Certainly there will be a replacable glass cartridge type fuse. It will be there, not only for Sanyo, but for all TVs. The fuse used is for protection. That is, if anything wrong happens to the power supply or its internal circuits, fuse will blow up, and prevent further damage to other components. Therefore, you must understand that if fuse in your TV has blown up, certainley there will be some reson for that. Without find that reason, and rectify it, never put a fuse there, it it has blown. It will cause more trouble to your device. Check it well. Find out the reason for the blown out fuse. Rectify it first, and then put a new fuse there. OK.
It shows that there is shorting in the further circuit,check MOV (metal oxide varistor) used for protection in the mains supply,MOV is mounted parallel to the main input supply,if o.k check further bridge rectifier and finally switching device used for SMPS power supply either transistor or STR by replacing the same.
It may just be a fuse that is blown.
If you take the back cover off and follow the power cord you should be able to find the a.c line fuse, it will be a glass fuse with metal end caps.
A blown fuse will show a broken filament inside or blackened glass.
You may also have d.c fuses inside , they will look the same sa the a.c fuse.
Their values should be written on the circuit board near the fuses and always on one of the end cap.
something like250V/3A for 3 amps.
Hope this will help. Good luck
Yes it will be obvious and you don't need a schematic to find it. What you actually may need is an ohmmeter to find exactly what fuse is blown in case there are more than one fuse present. You can also find this symbol on the board that indicates the fuse. Sometimes this symbol is drawn inside a box.
You may have a blown fuse. First unplug the TV and take the back off of it and then look for a tube shaped glass with two metal ends. Take it our and visually inspect it, if it looks burnt on the inside then you have a blown fuse if it does not look burnt, take a multimeter set to resistance and measure the resistance between the two metal ends (put the leads of the meter on the metal ends, black on one and red on the other) you should read 0 ohms (zero ohms) any other reading is bad. Now if the fuse is bad buy replacement fuses from your local electronics parts store or from Radio Shack. Replace the fuse and see if this solves your problem. Plug the set back in and if the set powers up and remains up unplug the set again put the back on again and you are finished.
If the fuse blows again you may have a problem in your LV power supply path or your HV power supply path. In either case this requires that you know electronics, and I would suggest that you take your TV to a qualified TV technician.
The outage actually is not the problem but the spike that happened when your power came back on did the damage. That aside, you may just have a blown fuse. If you are able to and feel comfortable work with electronics, with the TV unplugged from the wall, take the back off of your TV and take a look at the line cord going into the circuit board, this will lead you to a fuse holder, look at the fuse and see if the filament inside has been blown (opened). If the fuse is blown relace it with one of the same amperage and voltage which should be written on the metal part of the fuse. Once the fuse is replaced, plug the power cord back into the wall and power it up. If it comes on and plays, that was your problem and you can turn the TV off unplug it and put the back cover back on, plug your TV back into the wall and enjoy. However if the fuse blows again, that could indicate a problem with a short somewhere in the powersupply path and that will require troubleshooting the set. Now I we have to troubleshhot this TV you will need a multimeter, an oscilloscope, and a schematic of the TV (at a minimum). If you do have electronics experience to this level and do not have this type of equipment, You will have to take the TV to a repair shop.
Thank you, and I hope that it is just a blown fuse.
Unplug the tv set for 30 seconds, plug back in and turn set on, if its wont fix the problem, and you're NOT under warranty you should at least open the TV and look for a blown fuse near where the power cable enters the set. A lot of times you can buy replacement fuses at a local electronic or hardware store and they're easy to replace.
Check the fuse. If it is blown, it will be obvious and make sure that the set is unplugged before replacing it. If it blows again, or if it is not blown, your problem is probably in the 'X' volt regulator and you will need professional help with the repairs.
You can also check the board where the components are mounted and resoled any that look bad. Brief power outages may cause the TV to turn off on its own. If you are using a surge protector, try connecting the set directly to the wall outlet.
In your case it could caused by a blown fuse, a leaky diodes or a bad solder joint at the horizontal drive transformer.
All can be replaced at a local electronic or hardware store and they're easy to replace
If this does not correct the problem, you may need to have your TV serviced.