Question about Samsung Televison & Video
Internal checking circuits, most likely the high voltage circuit. Take off the rear cover. From where 120 volts AC, leads to a fuse, then to a small high voltage transformer, then a capacitor. Check DC voltage at the capacitor. For me it was 380 volts. This capacitor needed to be replaced. Samsung uses a 100 uf rated at 450 volts. Found some old power supplies and got two capacitors - 150 uf and 220 uf both rated at only 400 volts. Had to connect them in parallel making 370 uf. The voltage check was 391 volts, but my TV is now working.
Posted on Jan 12, 2018
SOURCE: TV won't turn on
my philips plasma tv just shut of on me one night, i tried everthing 2 get it working. A repairman said to fix it approx $450.00. I paid over $2500.00 3 YEARS ago didnt know if it was worth paying out that money and then it breaking down again. For three months i kept the tv untill i decided what 2 do, couldnt bring myself to trash it. So this week i took of the back panel there was so much dust inside carefully removed all the dust, Still it wouldnt work so then i decided to go to where the powercord is to see if anything burned out, it hadnt. I followed where the cord went to and noticed that there was a fuse beside where it when on the board so i removed it when to lowes and bought replacement fuse for $1.75 put it in and bingo it started back up after about 4 months of trying.I hope it works for you. you have nothing to loose you will have to either trash it or let some repair man rip you off . Good luck
Posted on Nov 29, 2009
The only way to reset the TV is to remove the cord from the wall, wait for about 1 hour, plug the TV back into the wall, and turn it on. If it still doesn't power up, it means it has developed a power fault.
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 from www.shopjimmy.com.
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.
I hope this helps.
Posted on Sep 28, 2011
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