my tv just randomly decide to stop working there’s no standby light on and it won’t turn on in general it’s a Samsung Model: T32E390SX. If anyone could help me it would be much appreciated
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@cameronmcd no power and no standby light is usually an indication of a bad power board. Post an image with a close-up of the power board. You need to check for power (110V !) on your rectifier to see if you got power on the hot side. If you do check to see if you have power on the connector that goes to the mainboard. See if your board has the 11V going to that. If it does not you will need to check the capacitors as well as the sides on the board. Hence the need for a close-up picture of your power board.
@cameronmcd this is a power board model that has issues with some of the diodes. Visually it checks out and no obvious damaged components like blown caps. You will need a multimeter to check it further. First, check the fuse for continuity. If the fuse is okay you can check for power on the rectifier. Remember this is the Hot side so you have full AC voltage which will pack a punch if you get zapped on it. Use your multimeter in AC mode and place the probes on the two center points and you should get the AC voltage on there. You can check the rectifier by then putting your meter in DC mode and place the red probe to + connector (on the top side as shown on your picture) and the black probe on the negative connector (bottom connector in your image) Your meter should now show that voltage in DC. Again it’s the Hot side so the full voltage is expected. If that voltage shows check J811 for 13V DC. If that is not present your board most likely has bad diodes. Replacing those could get you back in business. I could not find the schematics for this board so it will be difficult to test it further. Like @jayeff said, you can of course skip all this and replace the board. It’ll be less fun but could save you time and aggregation.
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Hello mate thank you for the reply I’ve posted a close up of the power board above
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Hi @cameronmcd,
First check if the TV responds by pressing any other button except the Power button, on the TV (on the back, right side) or the remote control.
If the TV does respond e.g. audio, images etc try a power refresh and check if this resolves the problem. Turn off and remove the power from the TV and then press and hold the TV’s Power button (on right side, back of TV) for a full 30 seconds and then release it. Reconnect the power to the TV and try turning it on etc.
If the TV does not respond, no Standby light is indicative of no power being received by the mainboard from the power board.
First check that the fuse (T3.15A 250V) is OK, by disconnecting the power to the TV and testing the fuse for continuity with an Ohmmeter. (see image below)
If the fuse is OK there is a problem with the power board.
Check that there is +13V power on the testpoint on the cold side of the power board (see image below)
If there is no +13V check that the diodes as marked in the image are OK and not short circuit or open circuit.
(click on image to enlarge)
If the fuse is blown, you need to replace it with a T3.15A 250V slow blow fuse (as indicated by the T in the fuse specs). A standard fast acting fuse will blow as soon as the power is connected to the TV due to the initial high inrush current, whereas a slow blow fuse will hold. Be aware that if the fuse is blown, that there is always a reason for this, so this will have to be further investigated. It may be prudent to purchase 2-3 fuses.
Be safety aware when working/testing in the back of the TV with the power connected, as there is exposed lethal AC voltage present on the power board.
Alternatively you could just try replacing the power board. Search online for Samsung T32E390SX power board or BN44-00801A PSLF720S07A L32SF_FSM (verify that I have got the correct board by comparing this number to what is printed on your power board - if it isn’t the same, search for the full number on your board) to find suppliers that suit you best.
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Thank you for helping from what I gathered then is that my power board is damaged I’ll have a look at new ones thanks!
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