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Power supply board

Tv doesn't go on at all

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After replacing all capacitors on the power supply board,Tv still doesn't come on


if only a blinking indicator at the tv panel that was mean has an error detected by the main board. if no any power indicator then you have been already replaced bulging capacitors but still won't turn on. at this time you will need to have voltage checking using a digital tester, if their is an output voltages at the power supply board.

Jan 18, 2013 | Samsung LN46A530 46 in. LCD HDTV

1 Answer

The TV won't turn on. The little light by the power button doesn't even come on


Blown fuse caused by a shorted power supply. Relacing the power supply board should solve the issue in most cases. You can get a power supply board from www.tvrepairworld.com

Oct 27, 2012 | Polaroid LCD-1700 17 in. Television

1 Answer

TV will not come on even though the light turns blue


check for leak or bad capacitors in the power supply board, then if you can make a voltage checking just to ensure if output voltage in the power supply board are present. the 5v standby 5v switch 12v and 24vdc at the power supply doesn't drop.

Sep 03, 2012 | Televison & Video

2 Answers

MY TV WONT GO OFF STANDBY


if you didn't set it it won't go to standby

Sep 27, 2011 | Sharp Aquos LC-32G4U 32 in. HD-Ready LCD...

1 Answer

A Toshiba Flat Screen (52"


U tries check the power source and unplug,replug the tv back like about an hour later.For the tv to do a resetting itself back to the factory setting.No,fans in LCD or Plasma flat tvs.If this tv a LCD flat screen tv than the tv have power supply board problems,this tv doesn't have fan design into it.After it goes off the tv power LED light indication on the tv bazel frame are blinking?Yes that the tv have a power supply board can't sustance power voltages to the tv anymore.The tv power supply board that the board where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish power supply board for the replacement.Or have the tv service by a athorized LCD tvs and Plasma tvs shops.

Aug 17, 2011 | Toshiba 52HL167 52 in. LCD HDTV

1 Answer

It doesn't turn on


Hello,

The power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.


I hope this will solve the problem.......

Jun 13, 2011 | Televison & Video

1 Answer

HI I have a 32"


Hello,

first, make sure the TV is correctly plugged into the wall. You can try another outlet. If that doesn't work, then your TV is certainly having a power problem.

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on......

All these can be checked on the power supply board.......

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes).

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.......

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

Yours sincerely.

Elect_Comp.

May 16, 2011 | JVC AV-32850 TV

1 Answer

Having trouble turning my Tv on,have to turn it on and off/plug and unplug for a while to get pic and sound.Can you help?


Good day!

The problem of your TV could be the power supply.

Please follow this steps on how to fix that problem
:

  1. Remove the back cover of your TV.
  2. Try to look at the power supply board (it usually directly connected to the power cord)
  3. Plug-in your TV and power it ON to perform a voltage data.
  4. Check the input voltage of the power supply.It should have 110vac or 220vac it depends the input voltage of your TV that comes on the outlet.Use multimeter tester (range in AC)
  5. If the input voltage of the power supply doesn't have a reading,the power cord is defective you need to replace it.
  6. If the input of the power supply have 110vac or 220vac.Please check the output voltage of the power supply using your multimeter tester (range in DC).Normally it should have 5vdc for the system board,12vdc for the audio system and 24vdc for the inverter board (back-light).Also look for the leak/bulged on the top capacitor.If any replace it with the same type,ratings and value.
  7. If the you have done all procedures above and you have found any defects and the output voltage are complete.The problem could be the the system board or main board of your TV.This is not for D.I.Y because the parts are surface mount and its very sensitive.If the problem is main board you have to replaced it,buy a new main board its available at the market.
  8. When the output voltage of the power supply doesn't have reading,please check the following
  • Fuse---look if it is busted
  • Power transistor----If it is shorted (range in diode test)
  • Resistor----If it is open or change value (range in ohms)
If you found any defective parts replaced it with the same type,ratings and value.


I hope this solution will be helpful.Thank you and good luck.
Don't forget to rate my answer thank you.

May 09, 2011 | Televison & Video

1 Answer

Hitachi L26D103. Less than 2 years old. Working fine one day. Turned on the next day and the sound works, but not the picture. This is an issue when in both the TV and DVD modes.


Good day!

If your TV doesn't have a picture even you play a DVD it means there is problem to your TV.It could be the Inverter board or the cold cathode lights is busted.


This are the steps on how to fix that problem.
  1. Remove the back cover of your TV.
  2. After that,plug in the TV and power it ON to perform a voltage data.
  3. Check the the output voltage of your power supply by using multimeter tester (range in DC) then check the 24vdc(supply of inverter board).
  4. If you have 24vdc in power supply output,check also the input voltage of inverter board if have 24vdc.If doesn't check the wire connection from power supply to the inverter board.
  5. If have you input voltage of inverter then check the high voltage output of it,if have at least 500vdc so be careful to check it because it have a high voltage.
  6. If doesn't have high voltage output replace the inverter board and if have a output voltage the cold cathode lamp inside is busted so you have to replace it
The inverter board looks like this:
bugoy31_2.jpg


You can buy it to this link: http://www.shopjimmy.com/catalogsearch/result/?q=Hitachi+L26D103+inverter+board

If this solution will be helpful please rate my answer. Thank you and good luck.

May 06, 2011 | Hitachi L26D103 LCD TV

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