Can low esr caps like Pnansonic FM gernally used on older TV`s?

[gonzo0815]

Hi all,

i am servicing an older (abouth 5 to 6 years) Grundig 16:9 TV 100HZ (CUC1981).
After getting it up and running, i now want to replace some big lytics in the main SMPS.

Original they used ELNA RE2, Philips 046 and an ATM unknow UNICOn (probably UCC) lytic.

Values are all between 1000uF and 2200uF, voltages from 25v to 63v.

From the 046 i assume that it is comparable with the 048 specs, wich indicates an ESR of abouth 100mOhm to 220mOhm.
The other caps are probably similar, far away from Panasonic FC or FM ESR spec`s.
The SMPS is desinged around a TDA4605/3.

The only well branded low esr long endurance caps for higher voltages i can easily obtain, are Pansonic FK, FC, FM, Nichicon PS, PM, Rubycon YXG (all from RSonline.de).
Now the ESR of 2200uF 25v Philips 048 series is about 120mOhm,
Panasonic FM and FC: as low as 0,0016mOhm.

Now i am not shure, if that low esr will not do some harm in that an old desing.
Most TV parts supplier do only sell Samwha, Jamicon or Yeago, wich i do not assume something good (in most cases only 1000h endurance). They won`t even think abouth ESR or like that.

For the smaler caps i probably use Pansonic FM or FC, as this is probably not that important.

Any advice would be aprecciated.

[gonzo0815]

Re: Can low esr caps like Pnansonic FM gernally used on older TV`s?

Comon guy´s does no one repairing CRT TV`s anymore?
Ok if no one has tried to put high quality caps in old TV than i may be the first
I will try it, but i will not replace all caps, just to be shure. What kind of caps are usually used for TV set`s? cheap GPO caps like Samwha, Yeago? is it otherwise too expensive?

BTW: does anyone have some datasheets for Samwha RG caps?

[starfury1]

Re: Can low esr caps like Pnansonic FM gernally used on older TV`s?

OK no TV guru and never worked on them as on day to day basis....

I think the circuit design should dictate how the components functions not the components characteristics.

Suppose the primary thing with a capacitor is capacitance...but maybe some aspect of its impedance is being used.

You raise an interesting point, could better spec and quality parts cause a problem...I suppose its possible.

I know of a MOSFET power amp designed in Oz for Hobbyist to build that by chance was designed with power resistors that just happen to have very low mutual inductance... you can imagine what happen when cheaper resistors were used that had a high mutual inductance

AS to GPO type caps well if they work then I really cant see why a better spec device shouldn't work as good and give better service life
(which I think is where you are going with this)

From my limited Knowledge I can't see why not, unless some aspect of a cheapie is being exploited but doubt it

As to the SMPSU, well I thought the idea was really to use Low ESR caps...part of the reason that characteristic was something to be improved on, maybe it was just cost that dictated the use of crappy caps and also when it was made there was nothing better..cost wise.

but humm yeah given the price of some of these chips I wouldn't want to stuff one....if it was me and it was my tele id probably replace with good quality ones....if it blows up Id myself later.

I found RG on thier site search but I had to use IE 7 and it was slow
(don't think they got pdf download)

Samwha

link, Didn't seem to want to open with Firefox or opera

Hope it helps

OK Thats my limited two cents worth
Now over to some of those that actually fix these things on a day to day basis and know what they are talking about

[kc8adu]

Re: Can low esr caps like Pnansonic FM gernally used on older TV`s?

the low esr cap will work fine.
maybe better than stock.
i had a mitsubishi 40" direct view set given to me by a shop.
they could not get vert lin right.
they had gotten whatever the hell caps mcm had at the time.
after a quick peek with the ol scope i recapped the v-out section with panasonic fc.
a quick touchup of height,lin,and greyscale gave a like new set.

[gonzo0815]

Re: Can low esr caps like Pnansonic FM gernally used on older TV`s?

ok, thx for the input, i just have put the FM`s in the box.
It seem to be no problem, as expected. I haven`t checked the set with my digital sat receiver, but the SMPS, deflection etc. are running fine and nearly withouth any buzzing.
From the Speakers i have a little humm, but may be this is due i haven`t have some input device in the scart plug.
Hope i haven`t messed up something, have had to fix a nightmar of cold solder joint`s too (jep, Grundig was using leadfree solder since ages, with all the drawbacks), more than i wanted to fix.....after an hour, attention levels are konstatnly degrading.