pumping noise from PSU in TV

[Aries Quitex]

Hello,

I always thought I'm a professional R&TV-Technician, but I'm slowly running
out of ideas:
I have here a Provision 14" TV portable, Type "ST-1410T PAL BG Black".
The only ID I'm able to find on the PCB is a codelabel on both rear case and
tuner, reading 938842.82832
I checked the horizontal and vertical driver stages, all OK, the CRT PCB is
also intact, but still the PSU generates a chirping noise, about 4 chirps
per second. When switching the set off the LED shows for a half second to
be pulsing in the sequence of the chirping.

Any Ideas, recommendations?

--
Sincerely
Aries Quitex
http://aries.eu.cx http://wanted.freesubs.de
Advanced Architecture - OS3.9 & GeForceIV =)

 

[James Sweet]

"Aries Quitex" <quitex@uni-bremen.de> wrote in message
news:bom7rr$1fsgb8$1@ID-211721.news.uni-berlin.de...

Hello,

I always thought I'm a professional R&TV-Technician, but I'm slowly
running
out of ideas:
I have here a Provision 14" TV portable, Type "ST-1410T PAL BG Black".
The only ID I'm able to find on the PCB is a codelabel on both rear case
and
tuner, reading 938842.82832
I checked the horizontal and vertical driver stages, all OK, the CRT PCB
is
also intact, but still the PSU generates a chirping noise, about 4 chirps
per second. When switching the set off the LED shows for a half second to
be pulsing in the sequence of the chirping.

Any Ideas, recommendations?

--

Something's still shorted, have you checked all the diodes and capacitors in
the output section of the power supply? You could also remove the rectifier
diodes one at a time to disable that output, that'll narrow down which one
is overloaded.