My Samsung UN50h6400AFXZA 50” 1080p 3D TV will turn on but has no picture. The sound will work but the screen is black. Tried taking a flashlight to it and couldn’t make out anything so I don’t think it is the backlight. The power light just flashes.
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Hi,
Try the following to see if the power board and tcon voltage supplies are OK.
If they are then more than likely the problem is in the mainboard.
Disconnect the power from the TV and then remove the back cover from the TV.
Disconnect the mainboard - power board cable at the power board.
Reconnect the power to the TV.
The TV backlights should turn on full intensity and stay on. There will be no picture or audio as the mainboard is disconnected.
If the backlights don’t turn on or if they blink, then there is a problem with the power board or the backlights
If the backlights stay on, then measure the voltages at the cable connector on the power board where the mainboard cable was connected. Their values should be shown in a table printed on the power board close to the connector.
If the voltages are OK at the power board, disconnect the power from the TV and then reconnect the mainboard-power board cable.
Reconnect the power to the TV and turn the TV on.
Check that there is voltage at the fuse (both sides of fuse) on the tcon board. Usually the fuse is located near the cable connector where the mainboard cable connects to the tcon board.
If you have no voltage there then as I said most likely the problem is in the mainboard. If there is voltage at the tcon board then it could be the tcon board but maybe it still is the mainboard, so try replacing it first
Be safety aware, even though you’re testing for low DC voltages there is exposed lethal AC power on the power board near to where you will be testing. If you don’t know how to safely test when AC voltages are present then don’t do it! Contact a reputable, professional TV repair service and ask for a quote
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