Re: Testing a HOT out of circuit.
- From: "Baraka" <grus_jc@xxxxxxxxx>
- Date: 30 Dec 2005 10:25:59 -0800
Matt Mac Donagh wrote:
> Sounds like your measuring that HOT correctly. If your getting 0 pretty much
> however you look at it then the thing is bad. You could also put your meter
> on auto range resistance and check it that way. Between the two outside legs
> you might get a low reading (no where near 0) but that would just be the
> internal dampening diode. Readings to the center leg from either outside leg
> should be pretty high.
>
> And yes, bad caps could cause the monitor not to fire up. What your hearing
> is the power supply coming on then shutting down because of the overcurrent
> protection thats kicking in because of the bad HOT...
>
> "Baraka" <grus_jc@xxxxxxxxx> wrote in message
> news:1135954466.923613.110210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > I'm working on this Tatung Chassis which goes in a merit megatouch. I'm
> > not getting any heater glow in the tube, just a repeated analong
> > chirping sound. It appears that the hi voltage wants to come on but
> > doesn't. I checked the flyback and it doesn't appear to be cracked.
> > Went over all the caps to see if there is any noticeable leaking,
> > checked the solder joints too. I'm suspecting it's a blown HOT on the
> > chassis. Now I'm used to the TOC type of transistors that mount to the
> > side. This HOT mounts to the chassis but is black with 3 legs that
> > mounts to the board. There is no mica insulator as the transistor is
> > self insulating. I pulled this HOT out of circuit and tested it in
> > diode test and get 0 in every which way I test it. Am I doing this
> > correctly out of circuit? Do I test this much like a TIP102 transistor
> > or am I missing something? Secondly, could old bad caps cause a monitor
> > not to get hi voltage and no heater glow?
> >
> > Thanks in advance for the tech assist.
> > John
> >
Thanks Matty! I knew I wasn't going nuts with this thing. I'll recap
the monitor and put in a new hot. Hopefull this sucker comes right up.
Happy New Year to all!
John
.
- References:
- TECH: Testing a HOT out of circuit.
- From: Baraka
- Re: Testing a HOT out of circuit.
- From: Matt Mac Donagh
- TECH: Testing a HOT out of circuit.
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