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Question about NEC FORTRON/SOURCE 145W POWERSUPPLY (FSP14561GN) Power Supply

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NEC FS-8001 No power. Found q802 2SA940 HARD BURN MARK ON MAIN BOARD. MEASSURED OK IN CIRCUIT. DRY JOINTS ON TRANSISTOR AND ASSOCIATED RESISTORS. STILL NO POWER EVEN WITH CHECK TO POWER SUPPLY. NO VISUAL INDICATIONS OR LIGHTS ON FRONT. PICTURE SUFFERED COLLAPSE OF BOTH VERTICAL AND HORIZONTAL FROM 80CM SIZE TO AROUND 10CM SIZED PICTURE. TURNED POWER ON AND OFF CAME BACK UP FOR 2 DAYS BEFORE SHUTTING DOWN.

Posted by DIRK FINK on

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Anonymous

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Check for short circuit on flyback transformer 44v rail and 14.5v rail
if ok also replace C821 and R826

Posted on Jun 11, 2009

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Anonymous

What techman is saying is replace Q802 (2sa940), check the surounding components and replace fault components if nessacery. she'll be right mate

Posted on Mar 13, 2007

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NEC is famous for under rating it seems there sets. Not sayying that the sets are not good but I've seen hundreds of NEC with what looks like over heating. I too hace seen several power supply problems and it comes to mind that a small choke that looks like a small resistor with wire wrapped around it has been the problem several times as you must also take out the parts that looks burnt and clean the area and take off all the overheated solder and clean up the pcb and reinstall and resolder with new solder if you want to not have intermittant connctions again. Oh almost forgot that these coils are on the output of the power supplys and make sure you check all the caps as well in the output of the power supplys as well as in the sweep supply as this can cause your sort of problem as well.. Good Luck PS if a resistor looks burnt they are so cheap you should replace it as resistors that look or have been overheated can and will breakdown under power or a load.

Posted on Apr 11, 2006

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My nec plasma 42 in comes on but stays dim and has old pics in background but sometimes it just starts working perfect help pls

Your description of the problem indicates that there is intermittent fault with the backlight circuit and components of the screen. Open and verify the devices and circuits that are associated with generating light from the device end towards the source of driving circuit. The fault may be detected lying in between, as a loose connection or dry joint. Device failure will hardly give an fault that occurs intermittently but a loose connection, dry solder joint or temporary partial shorting of circuits by some loose and strayed conductive substance.
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Tv cuts off then after a few min it comes back on or if you tap on the front by the RC jacks it will come back on. It does this several time a day.

Hi,
Your problem is caused by dry joints and cold solder on the board. If you have a soldering iron and soldering lead open the back panel of your tv. Look for dry joints around the board especially on the power supply section.Cold solder is hard to spot, it is necessary that your working area have sufficient source of light or you may use a table lamp.
Hope it may help you.
Have a nice day!
Thanks for using Fixya.
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