Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

[lotas]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Check the voltage between gnd and these points where the arrows are.

[Storyteller12]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

I am finding a bunch of smd's beeping on both ends (with one probe to GND). That must not be good?

No not good, but making progress. Now their should be a small black diode near those capacitors that are short. Check those diodes for continuity to find the short

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Check the voltage between gnd and these points where the arrows are.

Thanks for showing me! I very much appreciate it!
I have measured and added the image.

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

No not good, but making progress. Now their should be a small black diode near those capacitors that are short. Check those diodes for continuity to find the short

These all beep continueously, see image. Might have missed some though.. not sure what those diodes should look like on the board. Could you maybe point them out?

[nomoresonys]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

unhook the other cables from the mainboard (isolate it) and see if all those remain short, they probably will, the good news is there's probably lots of substitutes for the mainboard so it should not be hard to find a replacement if you have to.

[3DIL]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

there are some TVs (Samsung) that drive the LEDs only with the power supply, if it is the case of yours you can disconnect the main card from the source and leave the LEDs when applying energy in the source; this must drive the LEDs alone, so that it is useful if you have a problem on the main board, by not using it the starias discarding by default .. ps: when the LEDs are activated in that way they generate 100% of the brightness, they do not blink just turn on like a common lamp

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

unhook the other cables from the mainboard (isolate it) and see if all those remain short, they probably will, the good news is there's probably lots of substitutes for the mainboard so it should not be hard to find a replacement if you have to.

Now that's music to my ears!
Been trying to find the exact same board, but found it to be hard to find.
Any place I can see which would work (plug & play preferably)?
Thanks bro!

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

there are some TVs (Samsung) that drive the LEDs only with the power supply, if it is the case of yours you can disconnect the main card from the source and leave the LEDs when applying energy in the source; this must drive the LEDs alone, so that it is useful if you have a problem on the main board, by not using it the starias discarding by default .. ps: when the LEDs are activated in that way they generate 100% of the brightness, they do not blink just turn on like a common lamp

Yea, they do. So maybe my best option is to find the cheapest main board that works.

[nomoresonys]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

can you recheck and make sure that's the exact model number?

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

The one in the title I mistyped, in the OP I spelled it correctly; UE65H6400AW, Samsung.

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Main board says; bn41-02156a.

[nomoresonys]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

are those the numbers on the white sticker?

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

are those the numbers on the white sticker?

This is the sticker on the back of the tv;

[lotas]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Bn94-07341l

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Oh I was checking here, oopsie.

[Diah]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Standby;
Pin 1: 0V
Pin 2: 0V
Pin 3: 0V
Pin 4: 0V
Pin 5: 12.88V (expected 13V)
Pin 6: 0V
Pin 7: 12.88V (expected 13V)
Pin 8: 0V
Pin 9: 12.88V (expected 13V)
Pin 10: 0V
Pin 11: 12.88V (expected 13V)
Pin 12: 0.188V (idk what to expect? Legend says PS_ON)
Pin 13: 12.88V (expected 13V
Pin 14: 0V
Pin 15: 0V
Pin 16: 0V
Pin 17: 0V
Pin 18: 0V

Next I will post the voltage after pressing On button.
About the above voltages, those drop every second to just over 9V (and pin 12 drops slightly as well), and it coincides with the ticking of what I believe are the mosfets.

yours MB working.... this set the standby <8V and when it power on go high 13V. when you press power on TV you look like turn off and on again so its drop to >8 then up to >12.

when you have >12V on the socket just keep yours eyes on the Audio optical port if it lit red or not.

[nomoresonys]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

he has many caps on mainboard reading short., doubt that they are all short but there appears to be something wrong.

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

yours MB working.... this set the standby <8V and when it power on go high 13V. when you press power on TV you look like turn off and on again so its drop to >8 then up to >12.

when you have >12V on the socket just keep yours eyes on the Audio optical port if it lit red or not.

Does not lit red.
But before when I pressed power button on tv, the standby LED would go off and on again but now, when I press the power button, the standby LED is not responding. The remote isn't working either. The standby LED just stays red all the time.

[DutchDIY]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

he has many caps on mainboard reading short., doubt that they are all short but there appears to be something wrong.

Do you know which main boards are interchangeable with the one currently in the tv? Then I can buy the cheapest if I find one.

[Diah]

Re: Samsung UE65h5400AW Won't Turn On (Has Red Standby Light)

Does not lit red.
But before when I pressed power button on tv, the standby LED would go off and on again but now, when I press the power button, the standby LED is not responding. The remote isn't working either. The standby LED just stays red all the time.

i wrote on your early post.. yours MB working... now its shorted and it could be because you went to messure voltage on chips op on useres request. which was all fine.. so the short happen.