I am working on a Hitachi rear projection TV - Model 60SC2K that has
developed an unusual problem. When the set is powered up after being
off for a while, the red light on the front will light and the relay
will energize (click on), but there is no sound or picture. If the
set is left on anywhere from 3 to 5 minutes, the set will come on and
work perfectly. If it is shut down and restarted it comes on
normally. Only when it is turned off for any length of time will cause
a delay in turning on after power is pushed.

About a year ago, this set would intermittently shut down after being
on for a while. I found and repaired a couple of cold solder joints in
the vertical circuit on the deflection board which corrected the
intermittent shut down problem. I have not opened this set up yet, but
I was wondering if anyone else has ever run into this type of problem
and maybe point me in the right direction. For starters, I am planning
on checking the solder joints once again on the deflection board and
maybe checking capacitors in the power supply. Any additional help
would be greatly appreciated. Thanks!

wrote:
I am working on a Hitachi rear projection TV - Model 60SC2K that has
developed an unusual problem. When the set is powered up after being
off for a while, the red light on the front will light and the relay
will energize (click on), but there is no sound or picture. If the
set is left on anywhere from 3 to 5 minutes, the set will come on and
work perfectly. If it is shut down and restarted it comes on
normally. Only when it is turned off for any length of time will cause
a delay in turning on after power is pushed.



If that model still had the separate smps board, then there are some
high esr capacitors on it. As I remember they were either 4.7uf or
47uf value that would go bad all of the same value.

Not an unusual problem at all on these sets. Check the small electrolytics
in the SMPS for ESR. You will likely find your problem.

Leonard

wrote in message
ups.com...
I am working on a Hitachi rear projection TV - Model 60SC2K that has
developed an unusual problem. When the set is powered up after being
off for a while, the red light on the front will light and the relay
will energize (click on), but there is no sound or picture. If the
set is left on anywhere from 3 to 5 minutes, the set will come on and
work perfectly. If it is shut down and restarted it comes on
normally. Only when it is turned off for any length of time will cause
a delay in turning on after power is pushed.

About a year ago, this set would intermittently shut down after being
on for a while. I found and repaired a couple of cold solder joints in
the vertical circuit on the deflection board which corrected the
intermittent shut down problem. I have not opened this set up yet, but
I was wondering if anyone else has ever run into this type of problem
and maybe point me in the right direction. For starters, I am planning
on checking the solder joints once again on the deflection board and
maybe checking capacitors in the power supply. Any additional help
would be greatly appreciated. Thanks!