Acer Monitor 7276E Repair or Trash?

K

Karl

Guest
I've got a 7276E Acer whose image has collapsed to a single horizontal
line across the tube. For about a month prior to this the left edge
of the screen would wiggle from time to time.

Is this a known problem with these monitors. Is it something worth
repairing. If I can determine the bad component with the help of this
news group I feel comfortable in my skills to repair it.

If it's too difficult it heads to the trash. I hate to do that
because it's still a decent looking monitor. It's much better
looking than the yellowing that the Dell cases seem to do.

Thanks.

Karl
 
Since you used it with a defect, there are most likely some blown parts in
the vertical deflection area. The vert output IC may have to be changed
along with some support components. An ESR test of all the caps in the
power supply, horiz output, HV gen, and power supply sections is a must to
make sure that there are no defective caps, which was probably the cause in
the first place.

The total parts are not terribly expensive. They may run about $50 to $60
average, but the labour will be the bulk of the cost.

Remember that the CRT monitors now go for very low in price, with very good
performance, and a good warranty. If you want something very nice for
general work, consider an LCD display. These have a lot of advantage over a
CRT monitor for general use.

--

Greetings,

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


"Karl" <x10engineer@keystoneitc.com> wrote in message
news:921f26cb.0401220817.2647c10b@posting.google.com...
I've got a 7276E Acer whose image has collapsed to a single horizontal
line across the tube. For about a month prior to this the left edge
of the screen would wiggle from time to time.

Is this a known problem with these monitors. Is it something worth
repairing. If I can determine the bad component with the help of this
news group I feel comfortable in my skills to repair it.

If it's too difficult it heads to the trash. I hate to do that
because it's still a decent looking monitor. It's much better
looking than the yellowing that the Dell cases seem to do.

Thanks.

Karl
 
Some Acer monitors had problems with cracked solder joints, on the power
supply board edge connection. I repaired a 17 inch Acer (I don't
remember the model#) this way. So, it's worth inspecting the solder
joints. Otherwise, the monitor is probably toast.
GTB

Karl wrote:

I've got a 7276E Acer whose image has collapsed to a single horizontal
line across the tube. For about a month prior to this the left edge
of the screen would wiggle from time to time.

Is this a known problem with these monitors. Is it something worth
repairing. If I can determine the bad component with the help of this
news group I feel comfortable in my skills to repair it.

If it's too difficult it heads to the trash. I hate to do that
because it's still a decent looking monitor. It's much better
looking than the yellowing that the Dell cases seem to do.

Thanks.

Karl
Click to expand...
 
We have a number of these where I work, still functioning nicely. They
are a better than average monitor, but do suffer from bad solder and
some particular electros going high esr/low capacitance. Well worth
repair if you can do it yourself, but may not be worth the cost to pay
a tech for the repair. There are many tips regarding the common faults
with this monitor at the Anatek site here (three pages in all to
search) http://www.anatekcorp.com/faq/monitor.htm

Wayne

On 22 Jan 2004 08:17:32 -0800, x10engineer@keystoneitc.com (Karl)
wrote:

I've got a 7276E Acer whose image has collapsed to a single horizontal
line across the tube. For about a month prior to this the left edge
of the screen would wiggle from time to time.

Is this a known problem with these monitors. Is it something worth
repairing. If I can determine the bad component with the help of this
news group I feel comfortable in my skills to repair it.

If it's too difficult it heads to the trash. I hate to do that
because it's still a decent looking monitor. It's much better
looking than the yellowing that the Dell cases seem to do.

Thanks.

Karl
Click to expand...
 
On Fri, 23 Jan 2004 01:28:54 GMT, whmrs@mrbc.ca (Wayne) wrote:

We have a number of these where I work, still functioning nicely. They
are a better than average monitor, but do suffer from bad solder and
some particular electros going high esr/low capacitance.
Click to expand...
I agree that these monitors are well built (stable), the boards are
accessible from underneath, allowing to measure during operation
and give an acceptible picture. I would hate to throw them away.

To the OP: look for an IC on the left side of the board (seen from
front), sitting on a large aluminium heat spreader, some 9 connecting
leads, with label TDA... This is the vertical output amp.
Check the components around it for damage. Remove this TDA, polish
the heat spreader, carefully apply the right amount of heat conducting
grease, and fasten the replacement. You *may* be lucky in that this is
the only damaged component. These TDAs get quite hot during operation.

Being at it, check for a small blue ceramic cap next to the yoke
connector, having a value of some 100pF 2kV and replace it with a
4 or higher kV part.

Apply the usual care necessary to handle devices with galvanic
connetion to mains (power supply area) and high voltage. Work on a
solid bench, wear safety goggles, and avoid to break the CRT (filled
with vacuum :).
Much luck,
H.
 
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