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Power supply how to check voltage output

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ATX Version 1.2 - 20 wire motherboard connector Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 3.3V 3.3V Gnd 5V Gnd 5V Gnd P_OK 5VSB 12V Oran Oran Blk Red Blk Red Blk Gray Purp Yell Oran Blue Blk Green Blk Blk Blk White Red Red 3.3V -12V Gnd P_ON Gnd Gnd Gnd -5V 5V 5V Pin 11 Pin 12 Pin 13 Pin 14 Pin 15 Pin 16 Pin 17 Pin 18 Pin 19 Pin 20 The color scheme used for the voltages in the 20 pin connector holds for the other ATX standard power supply connectors. However, brand name manufacturers often build proprietary power supplies or make up their own color coding, so I wouldn't throw out a power supply that supplies 5V where you think it should supply 3.3V. It's more likely a proprietary design than a failure.

Posted on Feb 22, 2008

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Samsung plasma hp-r4272c, i dont have VS volt output on main power supply board


Just replace the main power supply board if there is no vs voltage output.

Sep 21, 2015 | Samsung HP-R4272 42 in. Plasma HDTV

1 Answer

I have sony J21mn11. problem not power on only red lit led only.i check all the components on the power supply area and horiz. output D1878 all are good. there is power IC STR S6707 on power supply area. i...


If you have a digital tester or analog try to check the voltage reading from the power supply if high or low or no supply.Check first following voltage location and section. * Check the AC voltage from ac cord to fuse and before the bridge type diode. * Check the DC voltage after the bridge type diode.if normal voltage. * Then check the voltage into the filter capacitor to regulator ic.the power ic.If theres a input voltage in the power ic,check the output voltage going to harizontal output.If no output the problem is you power output.You need to replace it.

Jul 12, 2011 | Sony Televison & Video

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I plug in my tv with a 125v cable my tv and nothing happens.


Good day!Follow this D.I.Y procedures to find the exact problem of your TV.
  1. Remove the back cover of your TV.
  2. After that,find the power supply board.
  3. If you already found the power supply,plug-in your TV and power it ON.Check the input voltage of it,using multimeter (AC range).If the power supply have no input voltage the problem could be the power cord.Replace it.
  4. If the power supply have the input voltage,try to test the output voltage if have 5vdc for the system and logic supply,12vdc for the sounds and 24vdc for the back-light inverter.Use your multimeter tester (DC range) to test that.
  5. If the power supply have a voltage outputs such as 5vdc,12vdc and 24vdc and the problem is still there.The problem could be the main board.Replace it with the same type and model # because the main board is no very difficult to fix and its very sensitive.
  6. If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
  • Fuse: Check the fuse if it is busted or blown.
  • Power transistor (regulator): Check the regulator if it is shorted or leak.
  • Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
  • Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.

I hope this solution will be helpful.Thank you and good luck.

May 29, 2011 | Polaroid TLA-04011C 40 in. LCD TV

1 Answer

My red standby light is off, checked the cord, had a power surge recently?


Good day.

This is the D.I.Y steps for troubleshooting.
  1. Open the back cover of your TV by removing all screws.
  2. Power ON the TV to perform a voltage data.
  3. Check the input voltage of power supply.It should have a 120 or 240 volts ac depends on the voltage supply from your power source.If none replace the power cord or check the main source.
  4. If you have input voltage in the power supply,check the output voltage on the power supply.It should have 5vdc,for the system board,12vdc,for the sound and 24vdc,for the back-light inverter.
  5. If you don't have output voltage from power supply board.Unplug the power cord first to check the fuse if busted,check some transistors and diodes if shorted,check some open/change value resistor and also look for leak/bulge on top capacitor.
  6. If you found any of the defective parts that mention on the step # 5 replace it with the same type and ratings.
  7. After that,try plug-in again the power cord then test the output voltage that mention on step #4.
Thank you for using FixYa and good luck.I hope this solution helps you.

Apr 18, 2011 | iLO V27DMBX Television

1 Answer

No power even if I plug my DVD to power source


Good day.

Follow this procedure for trouble shooting.

  1. Remove the cover of your DVD player.Loosening all screw.
  2. Check the input voltage of the power supply 220v/120v AC.If don't have input supply that comes from the ac cord,replace it.
  3. If you have a input voltage supply comes from the power cord.Check the output voltage of the power supply such as 5vdc and 12vdc.
  4. If the you don't have output voltage from the power supply.Check the fuse if busted,check open/change value of capacitor,check power transistor (regulator)if shorted and leak/bulging top capacitor of the power supply board.If you found any defective parts replace it.
  5. If you have output voltage comes from the power supply.The problem could be the main board,replace it.
  6. If you already done this procedure,test it by power ON the DVD player.

I hope this information will be helpful.Thank you and good luck.

Apr 17, 2011 | LG Televison & Video

1 Answer

Sony kv32v15 is dead with no sounds are lights. How difficult is it to replace the power supply / power management components?


since the problem is dead set all you need is open the back cover to trouble shoot, use digital tester. check blown fuse and then power on the unit check the output voltage at power supply panel board which supply the main CRT chassis board. if no output voltage check open fusible resistor its about .1 ohm, then check shorted rectifier diode and transistor sometimes cause by voltage fluctuation. just consider also the horizontal out put transistor it might be shorted cause by over current coming from power supply.

Apr 17, 2011 | Televison & Video

1 Answer

I forgot to remove input power supply of etower. Whilst emachines etower power supply was still on, i accidently moved the voltage selection switch to a higher voltage. There was big bang and fire happend...


Hi, First, check your power supply fuse for damage and switch the power to standard. Disconnect power supply output port and check your output voltage. If nothing abnormal, turn off power supply, connect the output and turn it on to check the power on your PC
Regards,

Dec 14, 2010 | E-Machines etower 566i PC Desktop

1 Answer

MY RCA 27" WILL NOT TURN ON, HAVE POWER TO THE FUSE, THE FUSE IS GOOD ALSO BUT THE DEGAUSS RELAY DOES NOT CLICK AND NO OTHER CLICKS ARE HEARD EITHER, WHAT COULD BE WRONG?


you need to check the voltage output of your power supply section.This power supply supply is a switching type power supply.there is a chopper transformer in there.its supply is a dc voltage unlike any other transformer which is AC supplied on the primary..First step.
1.Using a multitester measure the primary supply it is a DC voltage around 220v - 110 VDC
2.Measure the secondary output.The out put is AC voltage the supply for the B+ going to plyback is 115vdc the second output is 12v run through a regulator and the regulator lower the voltage to 5vdc.this 5vdc supplies the system IC and the jungle IC.this ic process the switching of the plyback transformer and the plyback transformers output supplies the voltage of the whole system including your relay in the degaussing section....once the plyback is activated the tv will now turn on...

good luck!Hope i helped you..

please rate my help..god bless!

Jun 13, 2010 | RCA F27641BC 27" TV

1 Answer

Powersupply


first you switch on the supply by shorting (green and black )wire in output socket of smps.then check output voltages.If there is no voltage then check switching transistors or protection transistos that is placed on first hit sink.check primary bridge and capacitors for open.

May 24, 2008 | Dell NPS-110AB (NPS110AB) 110-Watt Power...

1 Answer

Will not turn on.


  • proceed as given after your power supply is ok (your statement)
  • isolate power supply from h/output stage.
  • check diodes & capacitors connected with flyback transformer.
  • check for print short.
  • ckeck h/output transistor.
  • connect supply to h/output stage.
  • put on the set.
  • hope this will help.
  • good luck

still there is a drop in voltage then your fly back transformer faulty.

 

Oct 12, 2007 | RCA F32450 32" TV

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