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

http://www.shopjimmy.com/samsung-bn94-02701b-main-board-for-ln46c630k1fxza.htm



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 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.
With the Power ON, place a jumper wire across the GND/BLK and RLY/RED test points. (Ensure jumper wire only makes contact with the designated test points.)
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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.

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1 Answer

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Lg 50pc3dhas a sound but no picture


Failure in either of the following can cause no video output.
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  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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