Need help with Samsung LN40E550f7f

[Kindred1]

Re: Need help with Samsung LN40E550f7f

317 in standby, 364 turned on.

[Kindred1]

Re: Need help with Samsung LN40E550f7f

*correction* 371 in standby

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

Ok, I'm not positive but it looks like per post 95, if the proper voltage isn't there on powersupply with inverter unplugged from it, then the problems on the powersupply?

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

317 in standby, 364 turned on.

The standby seems quite high and the 364 seems a little low.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

*correction* 371 in standby

Ok then something is wrong, they are usually around 160 standby and 380 while on. I dont know what causes that but someone does I bet.

[Kindred1]

Re: Need help with Samsung LN40E550f7f

Thanks for all your input.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

I guess you could test your bridge rectifier.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

http://www.shopjimmy.com/samsung-bn4...upply-unit.htm if you click the image it will magnify.

I believe the bridge rectifier is BD801S.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

https://www.youtube.com/watch?v=zK8oNhFaRdM testing bridge rectifier.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

I always watch the videos, its very true that a pic. or video is worth a thousand words.

[Kindred1]

Re: Need help with Samsung LN40E550f7f

Lol, I just watched the same video before checking this. Diode mode isn't working on my meter, but I followed a tutorial and tested the ac and dc and it seems fine. 123 a/c 169 dc

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

Lol, I just watched the same video before checking this. Diode mode isn't working on my meter, but I followed a tutorial and tested the ac and dc and it seems fine. 123 a/c 169 dc

Ok cool, I guess the thing to do is keep tracing it out, til you find the bad component, if there is one.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

Check will62's post a little bit ago, he helped fix one with a factory reset. It was a panasonic but it had some symptoms like it could have been a bad board or such.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

Did you try a factory reset on this one?

[budm]

Re: Need help with Samsung LN40E550f7f

317 in standby, 364 turned on.

or *correction* 371 in standby

That is not right, in standby the PFC Voltage boost converter is off so the Voltage measured between the two legs of the main filter cap should be around 160VDC, when PS-ON is present then it should be around 380VDC in typical Samsung and most TV that has active PFC circuit.
Please retest the Voltage between the two legs of the cap again.

[nomoresonys]

Re: Need help with Samsung LN40E550f7f

https://www.youtube.com/watch?v=bK0qFueHopw be very careful, I would only do the reset, like he does and not change anything in there but if you cant see the menu then probably cant do it.

[Kindred1]

Re: Need help with Samsung LN40E550f7f

Did you try a factory reset on this one?

Well, from what I can see, there are no options in the diagnosis screen and I don't have the remote.

[Kindred1]

Re: Need help with Samsung LN40E550f7f

or *correction* 371 in standby

That is not right, in standby the PFC Voltage boost converter is off so the Voltage measured between the two legs of the main filter cap should be around 160VDC, when PS-ON is present then it should be around 380VDC in typical Samsung and most TV that has active PFC circuit.
Please retest the Voltage between the two legs of the cap again.

Ok,changed out my leads on my meter. Measured again. 165.0vdc off and 169.2
on. both caps. cp802 and cp803

[R_J]

Re: Need help with Samsung LN40E550f7f

never mind

[budm]

Re: Need help with Samsung LN40E550f7f

Ok,changed out my leads on my meter. Measured again. 165.0vdc off and 169.2
on. both caps. cp802 and cp803

Is the ON = 169.2V reading with PS-ON present? If PS-ON present then we have problem with the PFC circuit. But I thought you have 365V on the fuse next to the filter cap before in the earlier thread, that must have been an error then.