Hanterex POLO 28" micro-pulsating

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keropi
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Hanterex POLO 28" micro-pulsating

Post by keropi »

Hiya!
I've been meaning to ask this some time ago but first I wanted to recap the chassis some more. All electrolytics are replaced with Nichicon/Sanyo caps from rs-components and the big input capacitor is a new Nichicon one that is rated to last 10k hrs@105 degrees. Colors are nice and vibrant, geometry is fine. My issue is that the whole screen micro-pulsates , meaning it enlarges/reduces it's size maybe 1pixel constantly and it's irrelevant to bright stuff happening on the screen. I hope the description is good enough :oops:
I also tried cleaning the geometry/size pots with electronics cleaning spray , no change. Tried to capture the effect on video, here it is:



Any idea on what to try next?
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

since noone replied I have to wonder if my video is any good... I have seen the monitor live so it makes sense to me but maybe not to others? Or is it a case noone can recommend anything because this is uncommon? :(
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

i can't see anything happening
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

I will try and make a better video then hopefully it will be much better.
Thanks for the reply grantspain!
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

I have a new phone now and could capture a better video, hopefully these two will make the issue apparent. I know they are close-ups but it was the only way I could have the phone steady in order to capture this behavior:

http://www.mediafire.com/file/i1d0nxnu8 ... 57_Pro.mp4
http://www.mediafire.com/file/8a85d0p95 ... 04_Pro.mp4

otherwise the picture is OK... it almost looks like some interference :eh: - there is a general power input filter, the cab is getting powered from an APC protection/filtering strip, ground is connected everywhere it can ... Could it be the old poly caps?
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

coming up as unsafe link
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

what? weird it's from my mediafire account - nothing unsafe about it :wtf: I uploaded it there so there won't be any degradation/processing from youtube.
Here are tinyupload links then :)

http://s000.tinyupload.com/index.php?fi ... 2313977752
http://s000.tinyupload.com/index.php?fi ... 6853095178
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

disconnect the degauss
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

As always you are correct: I disconnected it and all is rock-solid now :awe:
So what am I looking at now? a leaking/dagraded posistor ?
Grantspain you need to change your name to Grantpolo :D
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Re: Hanterex POLO 28" micro-pulsating

Post by Shadolf »

It looks like zooming in and out, right? Reminds me a little of my Toshiba PF and the horizontal highfrequential microjitter. But the root of your problem and mine is different I think.

@Grant: What does the degaussing coil have to do with it?
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

the ptc is leaky, very common on hantarex chassis

Toshiba chassis zooming in/out-if entire picture then it sounds like flyback or unstable b+
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

so do I replace the PTC with a new Philips 2322.662.96009 and call it a day? Or is there a better part to install in it's place nowdays grantspain? Anything else related to look into?
Sorry for the long questions again but your input is more than valuable :D as this thing bothered me for many months now
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

keropi wrote:so do I replace the PTC with a new Philips 2322.662.96009 and call it a day? Or is there a better part to install in it's place nowdays grantspain? Anything else related to look into?
Sorry for the long questions again but your input is more than valuable :D as this thing bothered me for many months now
yes just replace it, it will good for another 15/20 years
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Re: Hanterex POLO 28" micro-pulsating

Post by Shadolf »

grantspain wrote:the ptc is leaky, very common on hantarex chassis

Toshiba chassis zooming in/out-if entire picture then it sounds like flyback or unstable b+
No, the Toshiba ist shifting from left to right and back in a high frequency. Just a very little distance. Is IT possible to get a new flyback for the Toshiba?
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Re: Hanterex POLO 28" micro-pulsating

Post by grantspain »

Shadolf wrote:
grantspain wrote:the ptc is leaky, very common on hantarex chassis

Toshiba chassis zooming in/out-if entire picture then it sounds like flyback or unstable b+
No, the Toshiba ist shifting from left to right and back in a high frequency. Just a very little distance. Is IT possible to get a new flyback for the Toshiba?
that's not flyback, that is a fault in the horizontal shift circuit
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Re: Hanterex POLO 28" micro-pulsating

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grantspain wrote: yes just replace it, it will good for another 15/20 years
thanks a mil grantspain, really appreciate your help!
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Re: Hanterex POLO 28" micro-pulsating

Post by keropi »

Just in case anyone else wants to get a PTC 96009 replacement, keep in mind that part number has been replaced with the 96209 part:

Image

so in reality one needs a 2322.662.96209 part (or PTC 96209 or 662.96209 judging from the various sources descriptions)

The same PTC is used with the POLO2 15/25 chassis btw .
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