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My samsung tv Model: LN40B75OU1FXZA keeps powering on and off intermittingly. Any technical help available?

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It's the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this IC is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop.
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Hello,

It's the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this ic is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop

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Jerry G.
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My samsung TV UN70NU6070FXZC can't turn on, the red light blink 2 times with dark screen and no sound, and this cycle repeated after about 20 seconds again and again. What issue is it and how to do?. My samsung TV UN70NU6070FXZC can't turn on, the red light blink 2 times with dark screen and no sound, and this cycle repeated after about 20 seconds again and again. The Tv reboot again and again. Have to unplug power cord to stop it. Samsung Main board BN94-14106C, Power supply board BN44-01016A 1. Disconnect main board from power supply board: plug power cord, backlight on, output=13v ch1=120v ch2=80v ok. 2. Connect power board to main board disconnecting two connectors to screen, it can be turned on/off normally. No T-con board is found, is it included in the main board or side board? a. TV Standby: red light on, sound off, backlight off. on power board output=12v ch1=ch2=0v, on main board SW=0.1v PW=12vx2, HAVDD=AVDD=VGH=VGHD=0v FB_TRDY_3=0v. b. TV On: red light off, sound on, backlight on, on power board: output=13v ch1=124v ch2=82v, on main board: SW=3.3v PW=13vx2, HAVDD=AVDD=VGH=0v FB_TRDY_3=0v VGHD=0.1v. It seems that video part of the main board is not working? 3. Only connect anyone of the two screen connectors to main board connecting to power board, it can be turned on/off normally. a. TV Standby: red light on, sound off, backlight off, dark screen. on power board output=12v ch1=ch2=0v, on main board SW=0.1v PW=12vx2, HAVDD=AVDD=VGH=VGHD=0v FB_TRDY_3=0v. b. TV On: red light off, sound on, backlight on, dark screen. on power board: output=13v ch1=124v ch2=82v, on main board: SW=3.3v PW=13vx2, HAVDD=AVDD=VGH=0v FB_TRDY_3=0v VGHD=0.1v. It seems that video part of the main board is not working too? Maybe both of left-screen and right-screen be faulty? It seems not to be possible. It is same if only disconnect anyone of the four screen connectorsillustration tv . 4. Connect both of the two screen connectors to main board connecting to power board, it can't be turned on/off normally. Dark screen, red light&sound&backlight blink 2 times for 2 seconds then all off. on power board output=13-12v ch1=115-105-0v ch2=77-70-0vbacklight: lightness-a little lightness-dark, on main board SW=3.3-0.1v PW=13-12vx2, HAVDD=about 6-0v AVDD=about 10v-0v VGH=about 14v-0v VGHD=about 11-0v FB_TRDY_3=3.3v-0v It seems that video part of the main board is working now?. And then after 20 seconds the cycle repeats again and again!! I had to unplug power cord to stop it. I replaced the main board and power board, nothing changed.

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