what causes the horiz output to blow when the set is on for 15 seconds?

Question

i have a 20" magnavox flatscreen tv it worked for about 15 seconds then blew the output.

I REALLY NEED HELP BAD

Answer 1

Age and type of set will also be an indicator.

The Horizontal output transistor (HOT) supplies drive to the deflection circuit and the high voltage power supply.
I am assuming the HOT is the output u are referring to.

Unfortunately, this is one of the most difficult "simple" circuits to troubleshoot.

The input is driven at a specific frequency. Since the output is tuned to operate at that frequency, if the freq changes, the load changes and can blow the HOT.
horiz oscillator problem.

if the deflection load changes that can blow the transistor.
shorted/open deflection coil or bad tuning caps.

If the high voltage load changes that could blow the HOT.
CRT short, dust/dirt, moisture.

the HOT could just give up with no external help.

The process for changing the HOT and bringing it back from the dead is tricky.

I have replaced a number of HOTs, in one set, before finding the real cause.

the best thing, unless u feel technically competent, is to take it in to a shop for an estimate. U may want to put your money toward a new set.

Answer 2

united states you probably did no longer supply adequate guidance. Is it a clean microwave, and has completed this by using fact you first delivered it abode, or did you have the microwave for a on an identical time as, and it basically all started tripping the breaker? If the unit is new, then that's drawing too plenty present day for the circuit that's plugged into. in case you have a diverse receptacle to plug it into, attempt that. do no longer use an extension cord, as they are going to overheat and reason a hearth. in case you do not have yet another receptacle to apply, call an approved electrician to cut up up the circuits. If the microwave is old, then the situation is the microwave, and there are numerous solutions above on what to do.

Answer 3

CRT horizontal deflection is high voltage, so it's likely that something got in the TV that shouldn't be there -- a bug, some liquid, a loose bolt or nut, etc.

Also, if it's an old TV, the high voltage causes parts to break down physically, so it just might be worn out.

If it's a new LCD, then we're back to something in the TV that shouldn't be there shorting out some of the circuits...