Does anyone know of a common fault with the Matsui 28wn where there
is a standby light but will not power up. It makes several sounds
(rumbles) through the speakers when an attempt to switch on is made
but then returns to standby. I cannot see any obvious blown caps or
DJ's and really don't want to do a blanket change of the power supply
components as i'm not sure this is the root of the problem. Any help
would be most appreciated.

Ian

(Ian) wrote in message . com...
Does anyone know of a common fault with the Matsui 28wn where there
is a standby light but will not power up. It makes several sounds
(rumbles) through the speakers when an attempt to switch on is made
but then returns to standby. I cannot see any obvious blown caps or
DJ's and really don't want to do a blanket change of the power supply
components as i'm not sure this is the root of the problem. Any help
would be most appreciated.

Ian

unfortunately, this sort of problem is rarely easy to put down to
visibly defective components. In fact on every set with this sort of
symptom i have worked on, the caps (and many other components for that
matter)all *looked* Ok but when tested had high ESR, etc.

You will need to check the HOT and measure the output voltage rails
from the power supply to check all is in spec.
Set could be in protect mode due to shorted HOT, Vertical...who knows?

good luck
Ben

(b) wrote in message . com...
(Ian) wrote in message . com...
Does anyone know of a common fault with the Matsui 28wn where there
is a standby light but will not power up. It makes several sounds
(rumbles) through the speakers when an attempt to switch on is made
but then returns to standby. I cannot see any obvious blown caps or
DJ's and really don't want to do a blanket change of the power supply
components as i'm not sure this is the root of the problem. Any help
would be most appreciated.

Ian

unfortunately, this sort of problem is rarely easy to put down to
visibly defective components. In fact on every set with this sort of
symptom i have worked on, the caps (and many other components for that
matter)all *looked* Ok but when tested had high ESR, etc.

You will need to check the HOT and measure the output voltage rails
from the power supply to check all is in spec.
Set could be in protect mode due to shorted HOT, Vertical...who knows?

good luck
Ben


Thanks for info.

Ian

Warn or defective parts usually do not show any visible clue to being
defective, unless there was a direct short of some type where there
was a lot of current involved. Proper troubleshooting has to be
performed, in order to locate the defective parts, and then they must
be chaged. It is very important to verify the cause of the failure, or
if not, sometimes the new parts may be damaged after the power is
turned back on again.

Jerry G.
========




(Ian) wrote in message . com...
Does anyone know of a common fault with the Matsui 28wn where there
is a standby light but will not power up. It makes several sounds
(rumbles) through the speakers when an attempt to switch on is made
but then returns to standby. I cannot see any obvious blown caps or
DJ's and really don't want to do a blanket change of the power supply
components as i'm not sure this is the root of the problem. Any help
would be most appreciated.

Ian