[TechAssist] Re: JVC TV AV2749S, anode HV level at 30kV- too high?
- From: "D Thunhurst" <dthunhurst@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 18 Aug 2003 08:36:13 -0600
I don't know if this would help but it may be worth looking into.
I had a customer with a Zenith 27" set that some other shop replaced the CRT
with one out of a JVC that used a bonded yoke. The picture was too narrow.
Installing the correct tube and yoke was definitely out of the question.
I played around with the collector caps on the horiz. output but not much
help. Then played around with the pincushion circuit and bingo, I had a
full picture.
Good luck,
Daryl
Daryl's TV
3310 Dyer St.
El Paso, TX 79930
915-565-9184
915-564-1024 Fax
dthunhurst@xxxxxxx
http://dynacomp.freeyellow.com
-----Original Message-----
From: Gary McCartney <gary@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, August 18, 2003 8:16 AM
Subject: [TechAssist] JVC TV AV2749S, anode HV level at 30kV- too high?
>I have this JVC TV, model JVC TV AV2749S in the shop. I had to change
>the yoke because it was burnt. I used a 27" yoke that physically looked
>exactly the same except for the connectors so I switched the connectors
>over from bad yoke. The geometry of the picture looks fine except that
>the picture is too wide (by about an inch or more). I have no way of
>knowing if it is this yoke causing this, or if the problem existed
>before and possibly even caused the original yoke to fail.
>
>Here is the data I can provide:
>
>-HOT collector waveform : 1200V p-p -perfect looking (no blips)
>
>-HV anode: 30kV at zero beam current
>
>-regulated B+ at output of STR30130 regulator: 130.1 Vdc
>
>- temperature of HOT heatsink after 1 hour run,
>taken directly above the HOT case: 44 deg. C (119 deg. F)
>
>- temp of B+ reg. heatsink after 1 hour run: 55 deg. C (130 deg. F)
>
>
>- if I change C525, 0.0062uF 1600V at HOT collector to a 0.0051uF, the
>picture narrows by approx. 1 inch but the HOT collector waveform rises
>to 1250V p-p and the HV anode level goes to 31kV. The heatsink
>temperatures stay approx. the same.
>
>
>The main question I have: Is 30kV or even 31kV too high to safely run
>this set at? I'd like to get it closed up and outa here. Any opinions,
>please.
>--
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>Guelph Ontario Canada
>Est. 1984
>email: gary (at) number63.ca
>
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