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Want to buy a Capacitor 50mm x 35mm 390 uF 400 volts DC

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Look in the yellow pages under electronics supplies wholesale.
that is a big capacitor. you may have to parallel 4 100uf @450 volts to make that value.

Posted on Sep 10, 2009

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Posted on Jan 02, 2017

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I have a Samsung un32eh5300fxw with a non-working backlight. I'm unsure on this model has the LED backlight driver is built into the power supply, mainboard, or the t-con board.


Take off the rear and check the high voltage circuit. 120 volts enters follows by a fuse into a small high voltage transformer, then on the other side a capacitor (100 uf rated 450 volts). Check the DC voltage here. I got 380 volts. Should be at least 390 volts or more. If anything less, you will need to replace this capacitor. I used two capacitors from some old power supply - 150 uf and 220 uf rated at only 400 volts connected them in parallel and TV is back to normal.

Jan 12, 2018 | Samsung Televison & Video

1 Answer

Tv back light problem


If the backlight is glowing then there is no problem with backlight. Check the high voltage circuit first where the 120 volts AC enters the TV. Then first the transformer, check the DC voltage on the capacitor - should be at least 390 volts. If not, replace it. The one is 100 uf rated450 volts. When I check my high voltage it was only 380 volts. So, I used two capacitors in parallel 150 uf and 220 uf (both rated at 400 volts, and that fixed the problem.

Jan 05, 2018 | Samsung Televison & Video

1 Answer

Samsung TV used tda9381ps/N3/3/1774ic nopicture nodisplay plainretrace line


High voltage is needed to power the screen. Check the high voltage circuit. Take off the rear panel. The high voltage is need where the 120 volts. There is a high voltage transformer and on the output the volts should equal at least 390 volt DC - check it at the capacitor. If not, check the capacitor. The one in the TV is 100 uf rated at 450 volts. I put in a 370 uf rated at 400 volts.

Jan 01, 2018 | Samsung Televison & Video

1 Answer

I have a 60 inch led samsung tv that only has a black screen and no sound other than the beep when it turns on and off. I can't bring up any menu or sound except sometime a faint static but it won't turn...


Check the power board, where 120 volts enter the TV. After the fuse, there is a small high voltage transformer. And on the other side, there is a capacitor (100 uf rated at 450 volts), check for 390 volts to 400 volts DC. If you have less than 390 volts, change the capacitor. I got two capacitors from old power supplies - 150 uf and 220 uf both rated at 400 volts. I connected them in parallel and the TV is back to normal.

Dec 28, 2017 | Samsung Televison & Video

1 Answer

Samsung tv model LN52a550p3fxza turns on and off repeatedly. Before this happening it would turn on but screen was pinkish. What part do i need to replace so it will turn on?


Before replacing the power board, check the small high voltage transformer and the high voltage circuit. From the 120 volts AC, trace the fuse, then the capacitor on the other side of the transformer for at least 390 volts DC. The input (control) board has a chip that checks all the circuits including this voltage. The capacitor is 100 uf rated at 450 volts. If the high voltage is not at least 390 volts, then replace this capacitor with a larger one 350 uf rated at lest 400 volts. And see what happens. Good luck.

Dec 27, 2017 | Samsung Televison & Video

1 Answer

I have a Samsung 55inch TV model PN50A510P3F. The TV has power but when I turn it on, it take at least 30 minutes to come on. It keeps powering itself on and off until it gets a clear picture.


Samsung uses three boards on its TVs. From the back, the video card is bottom center (should not be the problem), to the left is the input board (where HDMI s, USB and a one button inferred controller for manual setup) and the power board. The boards are connected by flat cables. Check high voltage circuit, after the 120 volts AC, then the fuse, then the small high voltage transformer and on the other side of this transformer is a capacitor - 100 uf rated at 450 volts. The high voltage here should be at least 390 volts DC. Any voltage less than this, the capacitor needs to be replaced. I used two capacitors 150 uf 400 volts and 220 uf at 400 volts in parallel totaling 370 uf, and my TV came back to life.Good luck.

Dec 27, 2017 | Samsung Televison & Video

1 Answer

My Samsung tv stops working on some channels and starts again over and over


Check high voltage circuit on the power board for 390 volts or more at the capacitor. If the voltage is less than 390, change the capacitor. Use one 3X the current 100 uf 450 volts. I used a 350 uf at 400 volts (could not find a 450 volts at home). A bad capacitor will cause voltage to go from 375 volts to 380 volts.

Dec 13, 2017 | Samsung Televison & Video

1 Answer

I have much Samsung TV that turns on but turns off after cycling picture has lines up and down and a loud high pitch noise comes out


The TV has a chip that check to see if the circuits are OK before turning on the set. Samsung has a power, input and video boards. The problem is when it check the high voltage circuit and it does not have 390 volts, the chip turn-off the power instead. You can buy a new power board or fix it yourself. The power board is where the 120 volts AC is plugged in, and near the 120 volts is small transformer, then you will see a capacitor rated 100 uf at 450 volts. Check for 390 volts here. If the voltage is less, then replace this capacitor with a 350 uf at 400 or at 450 volts.Samsung used a "small" capacitor when it should have ordered at large capacitor. Good luck.

Nov 28, 2017 | Samsung Televison & Video

1 Answer

Hy i have samsung ue40d5003bw and half of display (up) is horisontal lines with picture and half of the diplay (down) is clear picture.


Samsung uses a power board with one capacitor. (Ignore the video and input boards.) Check high voltage across the capacitor - should be 390 to 400 volts DC. If not the capacitor needs to be changed. Samsung uses 100 uf rated at 450 volts. I replaced it with 370 uf rated at 400 volts. (Did not have a 450 volts lying around.)

Nov 25, 2017 | Samsung Televison & Video

1 Answer

My LG 42LH5000 TV is not turning on. A few days ago suddenly switched off and now it doesn't turn on. The red LED is always on. If I unplug it turns off and when I plug again the LED is red again.


I had the same problem with Samsung. A web search located the issue being the capacitor. Take out the back and look for the capacitor near where the power line enter the TV. It was a 100 uF at 4050 volts capacitor. checked the DC voltage to be 381 volts. Got two old capacitor from an old TV - one was 150 uF at 400 volts and one was 220 uf at 400 volts. It turned out that it needs two in parallel (making 370 uf at 400 volts. Took out the under rated 100 uf and replaced it with these two. Checked the voltage to be 390 volts. That did the job. Samsung must have tried to save money by putting in a 100 uf at 450 volts. .

Oct 30, 2017 | LG Televison & Video

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