Question about Samsung LN46C630 TV

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Where is the main power board and how can i test it

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  • Samsung Master
  • 933 Answers

I have pasted a link that shows you exactly what the board looks like

What is the problem with you set?

Posted on Nov 28, 2012

  • pinkforee Nov 28, 2012

    It wont power on and no red light onfront of the tv!

  • Back2life Electronics Nov 28, 2012

    Ok, that sounds like a faulty power supply. It could be the main board but I doubt it. Some troubleshooting will need to be done before a ruling can be made. Do you have access to a multimeter?


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How to Test the Relay Board on Stairmaster SM916 Stepmill

How to Test the Relay Board on a Stairmaster SM916 Stepmill Disconnect power from the machine.
Disconnect the main cable from the relay board J1 terminal. Main cable should remain disconnected for the duration of the relay board tests.
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What was the problem you ever faced, before replacing the power board? In the main board, there are test points, but normally no repair can be done with these board, other than replacement. If you wish to get some details, Pull up older posts.

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Samsung LN32A330J1DXZA will not power on. Problem occurred after moving TV from one house to another. Samsung Capacitor repair came out and pronounced it a dead main board and did not perform any...

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It could be the main board. The main board controls the standby light on the front of the set. Check and verify that your 5vdc standby voltage is working. Next, I would check the "on" or "ps on" input on the power supply board. When you turn the set on (either my side buttons or remote) the main board should send a 3.3vdc signal into the "on" terminal on the power supply. This "on" signal from the main board turns on the other half of the power supply thus turning on your set. If you are not getting this signal from the main board, I would suspect the main board. To test your power supply, you can simply put a jumper from 5vdc to the "on" terminal on the power supply. Your 12vdc, and 24vdc power supplies should then become active.

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Fitnex t60 display says prg bad, what does that mean and how can i repair it

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4) Test the transformer controller supplying the 12VCA, to the power supply at the Main Controller Board since this supply the +5vd to the Display Board.
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As such boards are cheap and fail quite easily (both the two sustain and the buffers) Philips service manuals are more oriented at board swapping then at proper testing. In this particular case the buffer boards fail very easily because of a bad soldering to IC. The short will regularly blow the main sustain board.

To start when a main sustain (e.g. Ysus) is fried the TV will go in protect mode with the led flashing in standby. One test is done disconnecting the Sus board (with power off) and restarting the TV. If TV does not go in protect, then the sustain board was good.

If there is no protection:

The first thing to check on a main sustain board is the fuse. If the fuse has blown the IC is probably fried.I believe fuse is F5004. Check for swollen capacitors that may have blown. Test the FET. That is the core of the board as it is the power amplifier.

Here the service manual:PHILIPS_SM_15540.pdf - Right Click "Save Target As"

Here a more useful service manual. Check and follow troubleshooting diagrams in manual.

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1 Answer

I have a red light and thats about it...i have a 32 inch polaroid and it just wont power up

In case of FLM-3232 this can be both the main board and the power board.

I'd say the odds are in your favor that it is the power board - this is the more common scenario.

If you test the board and find that it produces proper primary voltage, though, then the problem is in the main board.

This is also curable sometimes, but unfortunately at least presently we do not offer a repair service for it.

For more details see here:



Hope this helps!

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2 Answers

Lg 50pc3dhas a sound but no picture

Failure in either of the following can cause no video output.
  1. Display Panel
  2. Y Drive Board
  3. Y SUS Board
  4. Z SUS board
  5. X Drive Boards
  6. Tape Carrier Package (TCP)
  7. Main Board
Try these if you have electronics background :
Note: Touch your fingers repeatedly to a ground connection point or unpainted metal in the product before proceeding.
  1. Unplug the unit.
  2. Remove the back cover by removing the screws holding it.
  3. Disconnect the LVDS cable from the power supply or from the main board. LVDS cable runs from the right bottom of the power supply to the upper left of the main board. Power supply is located at the upper center of the unit and the main board is at the right bottom of the unit.
  4. Plug the unit back and turn it on or the unit turns on automatically.
  5. Look for the Control Board. It is located right at the center of the unit below the power supply. It has a LED on it.
  6. On the Control Board at the right bottom of the MCM chip, the big chip right at the center of the board, you can see two test points. Short across the two test points.
  7. If there appears a picture of cycling colors and patterns, the Y-SUS, Y-Drive, Z-SUS, Power Supply, X-Boards, TCPs and Panel are all OK. The Main Board or the LVDS cable is defective.
  8. Check LVDS cable continuity.
  9. Replace Main Board if LVDS cable is good.
  10. If no picture of cycling colors appeared on step 6, some adjustment is off or some portion of the signal is missing.
  11. Check fuses or continuity of voltage supply lines going to the X Board/s, Y SUS and Y drive Boards and Z SUS Board.
  12. Replace blown fuses, connect broken lines, and resolder loose solders.
  13. If no apparent damage is found, ask for a qualified or experienced technician's service. Massive and sophisticated tests and voltage readings are required and proper tools are needed such as oscilloscope to find which signal is missing. The parts to be tested are prone to handling damage and requires proper handling and testing.

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