Sony G520 loses focus

J

James Sweet

Guest
Last night my otherwise reliable Sony G520 monitor suddenly drifted badly
out of focus. Today I opened it up and did some poking around, and after
removing the neck board and putting it back on it worked for a few minutes
then did it again, so I've done more poking around and fiddling with the
neck board and the focus pots and I have it pretty good at the moment, but I
haven't found any vibration or touch (with an insulated stick) sensitive
areas. Is there a common failure that would cause this? I'd really like to
track down what it was for sure so it doesn't happen at some other
inconvenient time.
 
The focus voltage in your monitor most likely comes from the high voltage
multiplier module. There is a good chance that the fault is in this module,
or in the CRT itself. In your monitor model type, this module may be part of
the flyback assembly. If so, the complete assembly must be changed to quick
test for this.

If you have a high voltage probe, you can check the focus voltage to see if
it is drifting. If so, then this can be determined by trying a new module.
If it is not the module, you can try tracing around to see if there is
something else that intermittent or not.

As for myself, in some monitors and TV sets, I have had either the CRT or
the HV multiplier module cause this type of fault.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"James Sweet" <jamessweet@hotmail.com> wrote in message
news:Cfpcc.198506$po.1023705@attbi_s52...
Last night my otherwise reliable Sony G520 monitor suddenly drifted badly
out of focus. Today I opened it up and did some poking around, and after
removing the neck board and putting it back on it worked for a few minutes
then did it again, so I've done more poking around and fiddling with the
neck board and the focus pots and I have it pretty good at the moment, but I
haven't found any vibration or touch (with an insulated stick) sensitive
areas. Is there a common failure that would cause this? I'd really like to
track down what it was for sure so it doesn't happen at some other
inconvenient time.
 
"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c4tbfd$hfc$2@news.eusc.inter.net...
The focus voltage in your monitor most likely comes from the high voltage
multiplier module. There is a good chance that the fault is in this
module,
or in the CRT itself. In your monitor model type, this module may be part
of
the flyback assembly. If so, the complete assembly must be changed to
quick
test for this.

If you have a high voltage probe, you can check the focus voltage to see
if
it is drifting. If so, then this can be determined by trying a new module.
If it is not the module, you can try tracing around to see if there is
something else that intermittent or not.

As for myself, in some monitors and TV sets, I have had either the CRT or
the HV multiplier module cause this type of fault.
Click to expand...
The module is part of the flyback, I've been using it with the cover off
ever since it happened and I can adjust it back into perfect focus but every
once in a while it either drifts fuzzy again or I hear an arc and it snaps
fuzzy, I do have a HV probe and will have to measure it, but at this point I
strongly suspect the flyback, annoying since the monitor is only a few years
old and hasn't been heavily used.
 
In TV sets, many times, I had to change the flyback to fix the exact same
type of problem you are having.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"James Sweet" <jamessweet@hotmail.com> wrote in message
news:45Gcc.84657$K91.184790@attbi_s02...

"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c4tbfd$hfc$2@news.eusc.inter.net...
The focus voltage in your monitor most likely comes from the high voltage
multiplier module. There is a good chance that the fault is in this
module,
or in the CRT itself. In your monitor model type, this module may be part
of
the flyback assembly. If so, the complete assembly must be changed to
quick
test for this.

If you have a high voltage probe, you can check the focus voltage to see
if
it is drifting. If so, then this can be determined by trying a new module.
If it is not the module, you can try tracing around to see if there is
something else that intermittent or not.

As for myself, in some monitors and TV sets, I have had either the CRT or
the HV multiplier module cause this type of fault.
Click to expand...
The module is part of the flyback, I've been using it with the cover off
ever since it happened and I can adjust it back into perfect focus but every
once in a while it either drifts fuzzy again or I hear an arc and it snaps
fuzzy, I do have a HV probe and will have to measure it, but at this point I
strongly suspect the flyback, annoying since the monitor is only a few years
old and hasn't been heavily used.
 
"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c5034k$aip$8@news.eusc.inter.net...
In TV sets, many times, I had to change the flyback to fix the exact same
type of problem you are having.
Click to expand...
Yep, that's my assumption at this point, everything else checks out. Now
where to buy a flyback for it?
 
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