Re: Toshiba Plasma TV 42HP95 (or 50HP95)

Hey, I too have won one of these fine gems!!! Further I learn that the prick that sold it to me has been inside of it so I doubt I will get much truth from him. I found that the power plug to the seine board has already been disabled and still will not turn on. Hoping now that it is something else since that seems a pricey part.

Do you have a service manual for these? I am not sure where to go now that the typical seine board was by passing and still a no-go.

I am working on a motor drive that uses 4 large filter caps on the DC rectification circuit. I originally looked at them and said "oh yeah, lucky find!" I desoldered them and they are testing good. I then removed the top cap wanting to confirm damage and was surprised to find the Al case is not bulged at all. I think the spray stuff they coat the board with simply reacted with the rubber caps and caused them to swell like this.

Has anyone seen something like this?...

Re: Help with audio PS. Capxon caps. test methods without ESR.

The amp is a D class integrated sub woofer amp. The schematic is attached. I am still wondering if I have a ground loop issue that I created somehow when working on it.

I am still just totally baffled how I went from having it working, to adding just a few screws and now nothing but a hum. The hum certainly sounds like hum you might get from a guitar amp but VERY loud but I guess this is an 18" sub so it barks a bit..

I have tested the bridge on the bench and so far is testing fine....

Re: Help with audio PS. Capxon caps. test methods without ESR.

This is a switching amp if that changes anything. I am strongly looking at grounds right now because I just cannot find a single component that is bad yet and I find it real odd that it worked for me, I added a few screws, and now it hums VERY loud through the driver. My gut is saying I either created a ground it should have or deflected the PCB in a way that caused damage but I cannot find it...

I visited here to specifically cover the filter caps. I am trying to determine if they are bad or not and if...

Re: Help with audio PS. Capxon caps. test methods without ESR.

The hum is near max output and you certainly would not turn it on and then try to do further testing.

Re: Help with audio PS. Capxon caps. test methods without ESR.

The actual schematic calls for 1000uf caps. the 820s were in the first revision. I have never seen caps increase that much in cap but that is still within a 20% range of 820. Is there other tests? Will ESR prove them bad if they are? I could stop by a shop to test them I guess. Really want to find my issues because like you say, I could hurt more components.

The bridge diode tests fine so if the filter caps are good, that moves us away from the DC buss anyway.

I am fighting an audio amp that first developed a popping noise with no output, then worked fine, now does nothing but make a VERY loud hum in the 60-120hz area. I am being told that the PS filter caps are most likely the problem but all my tests come up good so far. Amp was built around 1998

These are black body capxon, 820uf, 200V. Resistance with a DMM climbs from 0 to 40m ohms, I charged them with a diode tester to 1.5V. They are holding 1.1-1.3V right now. I also used a friends cap tester and they all came in around 950uf.

I tested the bridge rectifier with a diode...