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I have a sansui model 3618 with a blown fuse to the power supply but it blew so well i can read the marking can you tell me wich fuse to get it has t3.15al 250v writen on the board
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Chances are it will blow the fuse again if you replace it, a replacement power board should fix it, for future reference its not a good idea to run sensitive electronic equipment on a generator
Yes, TV's have an internal fuse on the power supply. All too often though more damage is caused besides a blown fuse or the fuse doesn't serve the purpose and the power supply is damaged. You can check and replace the fuse as necessary. If you need a replacement power supply, here is a list of vendors below. Have your TV model ready to help you find the part you need.
Look for a fried (possibly exploded) transistor or diode on the power supply board. In particular, look at the transistor mounted on a heat sink (metal radiator block) between the fuse and the largest transformer on the board. It may also have a damaged regulator chip driving it. Modern TV sets operated by remote controls generally have the power supply split into two sections
- standby and main. Your problem is most likely in the main section.
A voltage sniffer won't tell you much - most sets have power right up to the fuse on the power supply board. If the fuse is blown, don't bother replacing it until you find out what blew it - you'll just waste another fuse. I generally start by doing ohmmeter checks (power disconnected!) on the diodes and transistors - anything reading less than 1 Ohm is probably fried or is being shorted through a transformer winding by another fried component. Other readings must be interpreted according to the circuit design.
If you are confident enough to ground and discharge the main capacitor, check to see if it is faulty.
Check for arcing or scorch marks around the transformer and check the HV lines on the magnatron input for continuity.
If the capacitor has blown out, this can be replaced, however if the magetron or transformer is faulty this is a much more complicated repair and should only be done professionally.
this is a normal behavior if one of the power supply transistors have blown. take the unit to an enlectronics repair. they can either change the transistors affected (usually more than one) or replace the power supply board.
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