samsung un40f5000af


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samsung un40f5000af

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DTT
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Oct 1, 2017, 3:28 PM

Post #1 of 6 (1999 views)
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samsung un40f5000af	Can't Post

I have a samsung un40f5000af with sound but no picture. I ran the flashlight test and can see the picture. I went to the power board and measured 300VDC on1+ and 3+. The power board is a bn44-00609a. The voltage seems high to me but I cant find any more information on this board. Does anyone know this info or where to get the information about this TV ?

(This post was edited by DTT on Oct 1, 2017, 3:30 PM)

jts1957
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Oct 1, 2017, 4:47 PM

Post #2 of 6 (1991 views)
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Re: [DTT] samsung un40f5000af [In reply to]	Can't Post

With everything as the factory intended, unplug CNM803 on power board. IF LEDs Do not come on (and stay on), you have one (or more) failed LEDs due to running the TV with the backlight intensity at 100% since the day it was new. Wink

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DTT
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Oct 2, 2017, 11:23 PM

Post #3 of 6 (1972 views)
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Re: [jts1957] samsung un40f5000af [In reply to]	Can't Post

when that plug is removed I can not power the tv on at all.

jts1957
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Oct 3, 2017, 1:17 AM

Post #4 of 6 (1973 views)
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Re: [DTT] samsung un40f5000af [In reply to]	Can't Post

The backlights are the ONLY action that should occur. Don't expect to have audio, flashlight test video, keyboard/remote/power LED response, etc. Main board is without power.
Panel backlights = OFF when the AC cord is unplugged, ON when the AC cord is plugged in.

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DTT
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Oct 3, 2017, 4:00 PM

Post #5 of 6 (1961 views)
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Re: [jts1957] samsung un40f5000af [In reply to]	Can't Post

ok Then with the ac plugged in and that connector removed I should still see the 300 VDC proving the backlights are out. Do you think its worth it trying to replace them. It sound like it could be a nightmare.
Thanks

jts1957
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Oct 3, 2017, 6:19 PM

Post #6 of 6 (1960 views)
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Re: [DTT] samsung un40f5000af [In reply to]	Can't Post

For ONE LED to light, it requires three to three and a half volts.
For 91 LEDs to light, assuming my Jethro Bodine math skills are still working, it would require something around 273 to 318 volts.

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