Question about Toshiba 55 55SL417U LCD TV

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55sl417u chnged power supply and main still nothing

Toshiba 55sl417u problem was nothing came up on tv. changed power supply and main board still nothing. whats next???

Posted by Anonymous on


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  • 2 Answers

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Posted on Jan 02, 2017

  • 19396 Answers

SOURCE: I have a Toshiba 42hl67


The point is that with LCD TV (which are very different from computer repair) you often need testing before finding the fault. In this case you have replaced amost everything, the fault then is either the T-con, the main boardm (which are only parts with panel and chassis that you have not replaced), or one of the parts already replaced that had failed because of incorrect installation procedure.

Since it is very easy to fry a board, and since a technician diagnosed the inverter (I assume that they tested the TV), testing will start right from the inverter. The inverter is tested reading DC in from main board to master, dc from master to slave, and AC high voltage out from slave, which hosts the oscillator section that should also be tested using an oscilloscope.
Since the TV is in forced standby (protection because the fault is detected), in order to get DC to inverter from main, the control line to correspondent DC voltage from PSU must be activated. The inverter voltage is the higher DC line from PSU. This is activated jumping the control line with the 3.3 or 5V low DC from PSU. In this way both PSU and inverter get tested. The procedure is also a superficial test for some main board functonalities. This kind of test is done with live power and involves testing high voltage lines. For safety reasons the operation must be done by a trained person.

The alternative is once again taking a chance and replacing main and T-con, but as said, that is not a good way of repairing a 42'' TV.

Here parts for this TV.



Posted on Dec 06, 2010


SOURCE: 42rv530u toshiba tv no sound no picture change

The 42RV530U is known to develop problems in both the power board and the main board. You can check out our power board repair service at
and I'd also recommend that you search for 42RV530U at as we will eventually release an article on how to test the board.
Hope this helps.

Posted on Apr 25, 2013

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This is the picture of the main board to your tV.2_4_2012_6_28_32_am.jpg

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2 Answers

42rv530u toshiba tv no sound no picture change power supply and main board

The 42RV530U is known to develop problems in both the power board and the main board. You can check out our power board repair service at
and I'd also recommend that you search for 42RV530U at as we will eventually release an article on how to test the board.
Hope this helps.

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