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Samsung LN52A550P3FXZA LCD had clicking noise and Tv would not come on. No sound, No picture. Replaced 2 bulging capacitors. Other capacitors looked fine. I now have sound, but not picture. Very faint images in background. What's going on? What do I need to do?

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  • Samsung Master
  • 19,396 Answers

Hi.

If there are very faint picture in background, then the back light system is not working. That means that problem is either inverter powering the lamps with AC, main controller board managing the inverter, or PSU providing primary DC voltage to the inverter.
In your case the PSU was defective. The damage may have concerned more components apart the capacitors (resistors, more capacitors, solder joints etc.). Testing is done tracking voltage to inverter. The first thing to test is voltage to inverter from PSU. A general procedure is described here.
This test is done reading the DC voltage from the PSU to main controller. A malfunctioning controller board may not turn on inverter. Voltage in input and high voltage on inverter must also be checked. Voltages to check are 120VDC at CN801 on IP board (inverter power board) and DC B13V,B12V,B5V Voltages at BD105L,C1261,BD101 on PSU. For safety reasons testing with power on must be done by a trained person.

To make things easier, the whole service documentation has been uploaded here.

Here parts for this TV.

Regards.

Ginko

Posted on May 28, 2011

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It is a common problem for this model, the problem is the main board. There are 2 Tantalum capacitors (C102 & C131) 47MF/10V, 1 Passive Voltage regulator KIA7805AF (IC300), 1 Step-Down Power Conveter IC MP2363DN (IC101) need to be replaced. If you do not have soldering skills, just order a new board.

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Hi Brenda,
If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
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- Screen image disappears after several seconds
- Dim screen
- Slow start
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The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
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Take it to a repair shop.
https://www.youtube.com/watch?v=TR2iWN6b-LY
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If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
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- Screen image disappears after several seconds
- Dim screen
- Slow start
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- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
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Check the cables, connectors and connections.
Take it to a repair shop.

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1 Answer

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Your video and audio (sound) signals are generated on the main board. However, for those circuits to work properly, they have to have clean and accurate power from the power supply board. The power supply boards are notorious for bad capacitors. Has your power supply been recapped? Do you see any bulging tops of any of the capacitors? If you are not familiar with capacitors, just google bulging capacitors. There are plenty of pictures on the web to show you what they look like. It is possible that the main you have has a problem. I assume you order the same exact part #?

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1 Answer

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Good day!!!!


That problem is usually cause of faulty capacitors on the power supply board..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

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1 Answer

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Good day!!!!


That problem is usually cause of faulty capacitors on the power supply board..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

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1 Answer

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Good day!!!!


That problem is usually cause of faulty capacitors on the power supply board..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

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2 Answers

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This problems very common on a LCD tv.It the tv power supply board,have bad dying capactors,these capacitors are alway bulges or puffing up on it tops.That the board,where the power a/c cord plug into it.U have all the tools,know basic electronic and can do basic soldering?Just check the power supply board,for those dying capacitors that bulges or puffing up on it tops.Replaced these dying capacitors on the tv power supply board,ur tv will power up normal again and have no more clicking sounds and will not take anymore 2 mins or more to turn it on.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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