Envision EN-710e

[Bill W.]

My Dad has an old monitor he would like repaired. This Envision 710-e
has the following symptoms:

raster is very dim and has decreased by about one-third, not a front
panel adjustment problem.

diagonal lines across what is left of the raster.

hissing sound coming from transformer (not flyback) in SMPS.



I swapped the transformer from my (same model) monitor and it didn't
help. I also checked semiconductors with a multimeter (I know, not
much of a test) and didn't find any shorts or opens. I also checked
electrolytic caps with an ESR meter and they seem to be O.K.

Can anyone help fix this old monitor? The landfill doesn't need any
more electronics tossed in it. Thanks for any help!

 

[Bill W.]

My Dad has an old monitor he would like repaired. This Envision 710-e
has the following symptoms:

raster is very dim and has decreased by about one-third, not a front
panel adjustment problem.

diagonal lines across what is left of the raster.

hissing sound coming from transformer (not flyback) in SMPS.



I swapped the transformer from my (same model) monitor and it didn't
help. I also checked semiconductors with a multimeter (I know, not
much of a test) and didn't find any shorts or opens. I also checked
electrolytic caps with an ESR meter and they seem to be O.K.

Can anyone help fix this old monitor? The landfill doesn't need any
more electronics tossed in it. Thanks for any help!

I guess I should have mentioned in the original post that I touched-up
any suspect solder joints.

 

[me]

My Dad has an old monitor he would like repaired. This Envision 710-e
B.S.

has the following symptoms:

raster is very dim and has decreased by about one-third, not a front
panel adjustment problem.

diagonal lines across what is left of the raster.

hissing sound coming from transformer (not flyback) in SMPS.



I swapped the transformer from my (same model) monitor and it didn't
help. I also checked semiconductors with a multimeter (I know, not
much of a test) and didn't find any shorts or opens. I also checked
electrolytic caps with an ESR meter and they seem to be O.K.

Can anyone help fix this old monitor? The landfill doesn't need any
more electronics tossed in it. Thanks for any help

Off hand, check diodes and capacitors around the flyback transformer

 

[b]

My Dad has an old monitor he would like repaired. This Envision 710-e
has the following symptoms:

raster is very dim and has decreased by about one-third, not a front
panel adjustment problem.

diagonal lines across what is left of the raster.

How many hours on it?

start by changing:
main filter cap.
cap(s) on b+ line /psu secondary (typically 160v)
rgb filter cap (typically rated at least 200v around 2.2-10uF)

Measure the b+, I've found this is critical in the case of raster size
probs.

if there are still retrace lines, study the g2 or g2 bias circuit, you
may have an open resistor
it is possible too that the line transformer has become faulty.
good luck
-B.