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Re: THE COMPUTER IS NOT WOKING
Check the power cable/cord for continuity with your multimeter ok. Make sure also that the mains or power outlet is giving the right voltage. This is also done by the use of the multimeter - either analog or digital - any one at your disposal can do ok. if all work well, then the power supply unit should be removed from the system unit, connected directly with the power cord and then bridged. That is at the secondary output which connects to the system motheboard. Locate the power-on cable(normally green in colour) and bridge it with any black cable on the same row. The cooling fan at the back of the power unit should be rolling if the unit is ok. Good luck
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Hi our tv set need to be serviced. Here are some tips: 1. Open main fuse. The fuse is clean but interrupted. You can try replacing it with one o the same value. 2. Fuse Blown or blackened. Short in the rectifier bridge or in the switching transistor. Out of the power supply: supply line rectifier (100/150V) shorted.
check if there is power in the mains, check the continuity of the power cord,if healthy check the on/off switch. check the fuse if blown.if ok check by visual inspection for any burnt component in the switch mode power supply.
if you cant locate any, then you can measure the current limiting resistor, the rectifying diodes, the filter capacitor.also check the horizontal output transistor.
after finding any faulty component replace and test by opening the fuse and connecting a 100w bulb in series to verify if you succeeded. if the bulb glows bright and remains then there is still a short which you still have to find.
There must be a direct short in its power regulator section. Normally a shorted switching output transistor at power regulator section will cause this fault. You have to check all the components in the power supply switching retulator section, including rectifier diodes, zener diodes, electrolytic capacitors, small signal switching transistors etc. In fact, you have to check the components in the entire power regulator system. Never put any more fuse into it as an experiment; this will make more components to get damaged. Check the sets' circuit well. OK.
hi...if you have plug the TV in 22oV instead of 11V..it automatically blown the fuse..the power supply has this Varistor it will shorted and blown the fuse if detected high voltage....I suggest you replace the fuse and check for any other defective parts in the power supply section....check for bloated capacitors.. shorted power switching transistor... if none TEST RUN..let see if your TV will switch ON...please rate and vote...
If fuse blows off repetedly, it shows that there is a direct short inside the power supply section. You just check the mains rectifier diodes for short. iIf a rectifier stack is used desolder it out and check for short. In some sansui sets, ther is a metal oxide variste connected across the supply line inside directly. It is for line spike suppression and an overvoltage protection. If any of the above appears on the power line, the varistor will get shorted, and the fuse will go out, to prevent further damage to the circuits. Check that varistor for short. Check the resistance across main filter capacitor for any direct short. If it seems shorted, check the switching transistor for collectror to emitter leak, Resolder it out and check. These are the main reasons for blowing fuse. If the switching transistor has got leaked, you must check the entire SMPS control section, especially in case of used zener diodes, before replaceing a new transistor. OK.
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It is possible that the main power has failed, it can be from the fuse to the Switch mode supply driver.
Check on rectifier, capacitor, Sm driver transistor,Sm transformer, the feq.oscillators for Sm,output sections.
Trace with a voltage check to identify and confirrm..
This could be a problem with the power supply. Yes there is a fuse on the power supply & if you have a multi-meter & are competent with electrical safety, you could test it. However, if it has blown then almost certainly something else will have caused it. You might have a short circuit bridge rectifier or faulty chopper transistor. If the fuse is ok, then you will need to check voltages from the power supply to find out what feeds you have. There may be a start resistor open circuit for example. If most of the start up voltages are ok, then you need to look at the line output stage & check if this circuit is getting any voltage supply.
this might be due to power supply failure.
check fuse, switching transsistor, maincap& bridge rectifier ckt.
if it is ok than check for h/section failure.
check for h/output transistor &flyback transformer.
hope this will help.