shamrock C706-D5

[Alpi]

I've this 17" monitor but it has a black screen, no signal. I can follow the
voltage till a transistor MOS I think (about 330 V DC). Then nothing more. I
think that this semiconductor is the driver for the building of the power.
Does anybody have had this type of problem. Did he find the solution ?

--
Regards
alpi

 

[Wayne]

On Mon, 10 Nov 2003 20:27:36 +0100, "Alpi"
<NS-alain.pinchemail@skynet.be> wrote:

I've this 17" monitor but it has a black screen, no signal. I can follow the
voltage till a transistor MOS I think (about 330 V DC). Then nothing more. I
think that this semiconductor is the driver for the building of the power.
Does anybody have had this type of problem. Did he find the solution ?

--
Regards
alpi

I can e-mail you a schematic of the Shamrock C706 if it would help.
What is your actual e-mail address?

Wayne

 

[Craig Hart]

Hi..

The usual cure is to test and replace all suspect high-value high-wattage
resistors in the PSU - usually you'll find there's two half watt, 270k or
330k or similar value resistors in series from +330v to the switchmode
controller section which provides the turn on kick.

The second thing to do is test and replace all suspect electrolytic
capacitors in the PSU.

"Alpi" <NS-alain.pinchemail@skynet.be> wrote in message
news:3fafe643$0$2252$ba620e4c@reader0.news.skynet.be...

I've this 17" monitor but it has a black screen, no signal. I can follow
the
voltage till a transistor MOS I think (about 330 V DC). Then nothing more.
I
think that this semiconductor is the driver for the building of the power.
Does anybody have had this type of problem. Did he find the solution ?

--
Regards
alpi

 

[Alpi]

I have only found two 22 k in series and connected to the power line just
before the rectifiers. I have met the voltage at the switchmode controller
and have found about 12 or 13 V. OK thus. The mosfet is OK as well.
I will next test if there are pulses at the output of the controller.


--
Regards
alpi
"Craig Hart" <chart@nospam.ta> a écrit dans le message de
news:3fb21dfc@usenet.per.paradox.net.au...

Hi..

The usual cure is to test and replace all suspect high-value high-wattage
resistors in the PSU - usually you'll find there's two half watt, 270k or
330k or similar value resistors in series from +330v to the switchmode
controller section which provides the turn on kick.

The second thing to do is test and replace all suspect electrolytic
capacitors in the PSU.

"Alpi" <NS-alain.pinchemail@skynet.be> wrote in message
news:3fafe643$0$2252$ba620e4c@reader0.news.skynet.be...
I've this 17" monitor but it has a black screen, no signal. I can follow
the
voltage till a transistor MOS I think (about 330 V DC). Then nothing
more.
I
think that this semiconductor is the driver for the building of the
power.
Does anybody have had this type of problem. Did he find the solution ?

--
Regards
alpi