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.

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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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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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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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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.

Feb 19, 2012 | NEC Televison & Video

1 Answer

Lightning damage


Replace the parts with the original ones, a .5 ohm difference on a resistor on the video circuits will cause the unit not to work correctly.

Sep 27, 2008 | JVC HR-XVC27U DVD Player/VCR

Tip

Projection TV troubleshooting techniques.


When you turn your television on and get nothing almost anything could be wrong with it. The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem. Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

First for safety unplug the unit. If your set has no blinking lights proceed by checking the main fuse in the power supply for continuity and replace if open. Then proceed to looking at the mainboard for burned resistors or bulging electrolytic capacitors. Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct. If they are bulging replace them. Also replace any bad resistors found. At this point it would be a good idea to inspect all solder joints on all boards, but especially the Low Voltage and High Voltage sections, and resolder anything which looks suspicious.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure. Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating.

hardrocko

on Oct 13, 2010 | Televison & Video

Tip

When you turn your television on and get nothing but a clicking sound you could...


When you turn your television on and get nothing but a clicking sound you could have almost anything wrong with it. The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem. Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

If your set has no blinking lights proceed by unpluging and looking at the mainboard for burned resistors or bulging electrolytic capacitors. Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct. If they are bulging replace them. Also replace any bad resistors found. At this point it would be a good idea to inspect all solder joints on all boards, but especially the Low Voltage and High Voltage sections, and resolder anything which looks suspicious.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure. Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa.

hardrocko

on Mar 27, 2010 | Rock & Ice Climbing

3 Answers

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.

Feb 10, 2011 | Panasonic CT-36D32 36" TV

1 Answer

On the screen there is a green shadow on one side and a red shadow on the other side of every object in the scene


Hi,
This tv has two big black ICs as convergence output on deflection circuit board that are defective and causing problem in tv, IC number is STK392-110
replace both ICs to solve tv problem, also chekc for faded color big resistor nearby these ICs or those got burn mark, replace these resistors with same value, aslo check cold/ dry solder joints in deflection circuit board and resolder these joint/ connections.
Thanks.

Jan 21, 2011 | Hitachi 65TWX20B 65" Rear Projection...

Tip

Basic Direct View TV Troubleshooting Techniques.


When you turn your television on and get nothing but a clicking sound you could have almost anything wrong with it. The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem. Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

If your set has no blinking lights proceed by unplugging and looking at the mainboard for burned resistors or bulging electrolytic capacitors. Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct. If they are bulging replace them. Also replace any bad resistors found. At this point it would be a good idea to inspect all solder joints on all boards, but especially the Low Voltage and High Voltage sections, and resolder anything which looks suspicious.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure. Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa.

hardrocko

on Mar 27, 2010 | Televison & Video

1 Answer

Heat at some transistors and resistors in suv800x


most likely you have played your with either spk bad or bad wiring i have the same exact amp played it hard for more than two year and still have it sitting right now just bench test it last week still drive hard i think you make bad connection some for that to burn like that

Jun 18, 2009 | MA Audio Hard Kore HK-898 Car Audio...

1 Answer

Reads PROTECT on the display of my Onkyo TX-SV525 ???


HOWDY,         NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.

SUCCES !                              AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER

Apr 28, 2007 | Onkyo TX-SV525 Receiver

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