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Science Forum Index » Electronics - Repair Forum » JVC AV 27850 - common cause for deflection problem?...
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| John Hudak... |
 Posted: Mon Jun 30, 2008 12:43 pm |
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Guest
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Hi:
The vertical deflection went out on my TV a few days ago. It started
acting funny a few days prior to it going out altogether. I'd turn the
set on and the thin horizontal line would appear, then fully deflect,
and oscillate back a forth a few times, sometimes staying a line for a
min or two, then deflect to full screen, etc. Now it just stays on as a
thin horizontal like across the screen, about 1/8" thick.
Are there any things prone to failure in this set that I should look at?
OR, any common problems with this set in general? e.g. bad solder joints
around?
Thanks for any insight!
John |
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| Mark D. Zacharias... |
| Posted: Mon Jun 30, 2008 7:32 pm |
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"John Hudak" <jhudak at (no spam) sei.cmu.edu> wrote in message
news:g4b60l$vps$1 at (no spam) usenet02.sei.cmu.edu...
Quote: Hi:
The vertical deflection went out on my TV a few days ago. It started
acting funny a few days prior to it going out altogether. I'd turn the
set on and the thin horizontal line would appear, then fully deflect, and
oscillate back a forth a few times, sometimes staying a line for a min or
two, then deflect to full screen, etc. Now it just stays on as a thin
horizontal like across the screen, about 1/8" thick.
Are there any things prone to failure in this set that I should look at?
OR, any common problems with this set in general? e.g. bad solder joints
around?
Thanks for any insight!
John
Solder connections - if the ouput IC hasn't blown by now. Sometimes if you
put it off, the things blow up.
Mark Z. |
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| Chuck... |
| Posted: Wed Jul 02, 2008 4:53 pm |
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On this set, usually just soldering the pins of the vertical output ic
will fix it. Chuck |
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| John Hudak... |
| Posted: Wed Jul 09, 2008 3:25 pm |
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Guest
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Chuck wrote:
Quote: On this set, usually just soldering the pins of the vertical output ic
will fix it. Chuck
After taking it apart, I resoldered all the connections in the vertical
deflection section and checked the voltage out of the regulator.
Since I didn't want to reassemble it without possibly fixing it, and
since the set had some other flakey operation, I decided to resolder
mostly ALL the connections - mainly the horz deflection, the CPU, the
tuner board as well as the two massive connectors from tuner to MB, and
the convergance board (on the back of the CRT). The old shotgun approach...
One hour and 15 min later + 1/4 lb solder, I reassembled it and it has
been working fine...even the annoying intermittent turn-off/turn on
problem seems to have gone away. I declared success and put it back on
the TV stand...
Thanks for all the advice!
John |
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