Question about Proton MM2701VT 27" TV

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POWER UNIT SECTION

WHEN ITS ON THE POWER SECTION FUSE DAMAGED

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  • ravi chandran Apr 25, 2007

    I CHECKED THE TRANSFORMER ,DIODE AND CAPACITOR

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It has a short ckt.please replace the STR and the H-out transistor for sure!

Posted on Nov 28, 2007

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Posted on Jan 02, 2017

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Sylvania SRCD 820 4 in 1 unit powers up, cd diplay blinks (as if searching), but no power to the cd drive unit, hence, sled will not move and disc will not spin. Is there a fuse for the cd mechanism?


The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/

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Check the internal fuse. If found damaged, check for its reason. Without rectifying the reason; if any; never insert an other fuse in place. Check for damaged component/s at it audio output section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

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Every TV has a fuse. Fault with the main power supply regulator section circuit.. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

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If fuse blow up there should be a reason. In most cases damaged/shorted component/s at its main power supply regulator section. Contact any service technicain. This is not a user reparable fault. Gopakumar Gopalan Google

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You would have damaged the power supply section but in many cases the front end contains a surge protector with a variator which will short and blow the fuse. So check fuse replace and check for short in the input circuit of the power supply, if the Switch mode is damaged then you need to replace the unit with a 220 volt type or if only the 110 type is available then use a step down transformer to down the mains to 110V with about 0.5Amps

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The main power supply regulator section circuit has the fault. Check the fuse. Check for any damaged component/s there. You must be very careful when working with power supply section, as most of the components at this section will be very fatal to touch.

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My Bose radio stopped working, no sound no lights AWRCC1


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Check its power cord first. If it is OK, check its power supply section inside. There will be a fuse at the power supply rectifer board. Check it. If it is found opened [damaged] never put an other fuse, without proper check to the power supply and main audio amplifier section. There must be some reason for the blow up of this fuse. Without rectifying the fault, replacing an other fuse, may make more components to get damaged, and the repair work may cost more. OK.

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1 Answer

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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.

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Make sure that the voltage of the unit is according to the device as if you have plugged in a 120volt unit into a 220 volt supply the adapter or the power supply would be damaged.
So please check this out , if not check the power supply section of the adaptor for failure of fuse or powerr components.

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1 Answer

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Why it always blew, then you have a short circuit. It is not your fuse is the real problem because it is a guard to your unit. Once there was a short circuit it will blew to avoid further damaged to some parts.
It is commonly due to a shorted parts on the power supply section. You must isolate the shorted parts to back your unit to normal.
If you are not a technician then you must look for a qualified one to trace the shorted parts. This will fix your problem.
Thanks for using fixya.

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