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UN65TU8000F that turned off itself while watching it. No red light ind

@jayeff I have a Samsung UN65TU8000F that turned off itself while watching it. No red light indicator. I have unplugged the power cord then held the power on button for 45 seconds with no positive results. Any other suggestions would be greatly appreciated. Thank you.

Jeffbzs

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Hi @jeffbzs,

Was there a storm at the time the TV stopped working?

Just verifying that you checked that there's power available at the wall power outlet (powerstrip outlet?) that the TV is connected to?

No red light on standby is indicative of no power being detected by the power board.

It is the mainboard that turns on the red power light upon receipt of a standby voltage signal from the power board.

Disconnect the power to the TV and remove the back cover and visually check if the main fuse and suppressor on the power board are OK. (see image below for location)

If they look OK, use an Ohmmeter to check if the fuse is OK electrically i.e. it should measure 0.00 Ohms - a short circuit. If it measures OL or infinite Ohms i.e. open circuit, then it has blown for some reason. Search online for a T5.0A 250V ceramic axial fuse to find suppliers that suit you. Ordering 2 may be prudent ;-)

NOTE: The "T" in the fuse rating is important as it indicates that the fuse is a slow blow (or timed) fuse. Slow blow fuses are used when there is a high inrush current in a circuit when the power is first connected. They will hold until this current has subsided, usually after ~2-5mS whereas a standard fast acting fuse having the same current/voltage rating e.g. 5.0A 250V, will blow immediately the power is connected. The ceramic spec indicates that it is a type of fuse that won't shatter if it blows and the axial spec means that it has leads attached so that it can be soldered onto the board

If the fuse is blown then also test that the surge suppressor is OK or not.

If a replacement fuse also blows then most likely there's a problem on the power board.

If the fuse is OK reconnect the power to the TV and check if the 12V STB power is present at the STB reference point on the power board (see image below for location)

If there is no 12V STB power then there's a problem with the power board.

If there is 12V STB power then there's a problem with the mainboard

Be safety aware when testing for the standby power or whenever there is power connected to the TV and the back cover is off. There is exposed lethal AC voltage (and high exposed DC voltage when the TV is on) on the power board and near to where you will be testing for the STB voltage.

Block Image

(click on image)

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Jeffery Graham zal eeuwig dankbaar zijn.
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