Re: Samsung LE46B650 leds turn off in less than a minute.



Very informative video - good explanations. I liked this one very much.

Like him I placed voltmeter to AC and used chassis for ground.

So here are my observations:

- PIN4 of the little transformers go to the feedback circuit.
- Whenever I start to measure voltages on PIN4 it starts at about .4V or less and drops to 0 rapidly... why???? It does not for him.....

- connecting ground of voltmeter to - (minus) of one of the two 450V/100uF capacitors and trying...

Re: Samsung LE46B650 leds turn off in less than a minute.

Thank you man, for clearing that up!

Re: Samsung LE46B650 leds turn off in less than a minute.

nomoresonys@: yes, that is a very nice video on how to find a faulty CCFL. Since I have measured all transistors on the inverter board and they all had the same resistances within 5% deviation or so I suspect a faulty Lamp at this time.

@RJARRRPCGP: during writing my problem report I started to realize it is not a LED TV, but forgot to adjust to that.

@R_J: did you mean the voltage of + and - of the 450V Capacitors? Because strangely enough I measured only 7V and started to think my voltmeter is...

Re: Samsung LE46B650 leds turn off in less than a minute.



Sure thing!...

Re: Samsung LE46B650 leds turn off in less than a minute.



You are absolutely right. Its CCFL. Sorry for the confusion....

TV itself is working fine otherwise. Disconnecting AV board shows the same behavior. Typically LEDs will be turned off in about 10 seconds.

IP board is a BN44-00265A. I found a bad Capacitor and replaced it.
Near that Capacitor is a Transformer: IP-N46-PFC which looks burned but it could have been from the Capacitor nearby.
I measured 13.x V on the primary Side and nearly nothing on the secondary. I suspect I would have to replace it but I am not sure about that. Both coils have next to no resistance (0.001 Ohm).

Trying to find a replacement however...

Re: New Members - please post your introductions here

Hello fellow nerds and alike.

I am self teaching myself in repairing electronic stuff and found some of your posts very helpful.

Now however I will have to ask some detailed questions which I will write about in a new thread.

Regards