Re: Sony KV32S22 - half-way back from the dead - what now?

On Tue, 21 Feb 2006 04:06:29 GMT, "Shoreline Electronics"
<jstielau@xxxxxxxx> wrote:

Do you have a voltmeter? Measure the collector B+ on the Horizontal Output.
Careful! 130VDC and 1100V AC on there!

I would NOT try to measure the C of the HOT with a DMM. Those HV AC
spikes will damage many DMMs. It also might be possible for the
capacitance of the meter to damage the TV. If you have HV, there's no
need to measure this voltage.

If the heaters aren't lighting, but you have HV, then there must be an
open in the heater circuit. It's a simple circuit that goes from a
winding on the flyback to the CRT through a couple of resistors.
There should be two pins on the CRT socket labeled "H". There should
be low resistance between these two pins on the socket with the CRT
unplugged. The same pins on the CRT should also have low resistance
between them (a few ohms at most). You can also try measuring the
voltage between the two heater pins on the CRT board. Use a DMM in AC
volts mode. The number won't be meaningful unless you have a true RMS
meter, but it should be several volts. If you do have a true RMS
meter, it should be 6.3 V.
Andy Cuffe

acuffe@xxxxxxxxx
.

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