Panasonic Th 50PX70B 12 Blinks

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

I have been doing a bit of research and I am advised that if I am working on a power supply I should be using an isolation transformer - but I am having problems finding exactly what I should be using.

Can anyone advise on what type and where to get one from?

[tom66]

Re: Panasonic Th 50PX70B 12 Blinks

It's not vital if you are careful not to touch any part of the HOT side of the P board. The HOT side is surrounded by a white border and has "HOT" or "LIVE CIRCUIT" in it in places.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

Still trying to fix my Plasma. Could someone please tell me what these components are and what they do. The schematic is from the powerboard of the above Plasma and I am interested in L601 and L602

thanks.

[tom66]

Re: Panasonic Th 50PX70B 12 Blinks

They are the EMI filters for the input power -- they limit the noise the power supply kicks back into the mains. If your TV has power, they are not the fault.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

I am struggling to understand what this component does. It is on the power board of the above Plasma and is designated
L608

thanks if you can help me out, as I cannot find it on the schematic

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

thanks Tom, I made a mistake reading the schematic, i know about the EMI filters its the L608 I really needed to know about. Sorry for the mistake.

[tom66]

Re: Panasonic Th 50PX70B 12 Blinks

It's a ferrite bead -- again limiting the noise the power supply produces. It should appear as a short circuit on your ohmmeter, it is basically a piece of wire with magnetic material around it.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

cheers Tom.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

Can someone please advise me of why the lines on this schematic are traced in orange. I know it is probably fairly intuitive and simple but your help would be appreciated.

[tom66]

Re: Panasonic Th 50PX70B 12 Blinks

It means they are the major buses carrying power. Blue indicates a different voltage, etc.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

I am a bit confused, if that was the case why are the lines in and out of the bridge not Orange also, as surely that is a major power carrying line. I am not disagreeing with what you state, just trying to understand in more detail.

[tom66]

Re: Panasonic Th 50PX70B 12 Blinks

They only use them on the secondary outputs (isolated from primary), typically on the digital boards, to ease tracing through the fault. You won't see them so often on the power boards because those are easier to follow through, but some of the digital boards can be hard to trace otherwise.

[onpiopah]

Re: Panasonic Th 50PX70B 12 Blinks

thanks thats good information to know and really helps me out.