[TechAssist] Re: How does the TV know?FIXED
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 20 May 2003 16:46:15 -0700
So let me get this straight. If the set was plugged into the isolation
transformer first thing in the morning, the set would come on. But if
the set was plugged into the wall first thing in the morning, it would
not come on. Correct? If so, this is very puzzling. I do know that
caps that are toast will work off and on, and will work if an AC voltage
"warms" up the cap and gets it going again, like in a vertical circuit
with a black line at the top. What function was the 22uF cap
performing? This might be a clue to look into.
By the way, I also own a Dick Smith esr meter, and it is the best $70 I
ever spent. I had my Sencore first, but it is not very easy to use to
test caps in circuit. I do use it to test inductors and to ring
flybacks etc. But the tool I use the most is my ESR meter. I like to
test the value of the cap when the ESR is so high because it reminds me
of the days not so long ago when I only had a capacitance meter that
checked value only. Many times I would take a cap out of circuit, check
its value and put it back in. Little did I know that the ESR value is
also very important. But I had no way to test it until I got my Sencore
and my ESR meter.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
Sent: Tuesday, May 20, 2003 3:14 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: How does the TV know?FIXED
Yes Kevin I do have Dick Smith meter and yes it was above 99. No I did
not check the capcitance,and it was a 22mfd not a 220mfd. Not that it
matters in particular for the purposes of this discussion. If it is that
bad I don't normally check it any further. I think of more importance to
me anyhow,is why the set would turn on when plugged into isolation but
would not turn on when plugged in the wall outlet? Why did the circuit
that that cap was in, work in isolation but not line a/c?and why would
it work when switched in a couple of minutes to line and continue to
work all day.? Paul
Kevin <kevintv@xxxxxxx> wrote:
So you mean the esr value was above 99 ohms (if you have the Dick Smith
ESR metre). If the esr was above 99, then of course there would be no
reading. It would read like it wasn't connected to anything. I have a
sencore that can read up to 999 ohms for esr and even some caps have an
esr above that value. Did you measure the capacitance of the 220uF cap?
Just curious.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
Sent: Tuesday, May 20, 2003 1:02 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: How does the TV know?FIXED
There was no reading. Readings on my esr meter of" 00" would indicate a
short. I don,t recall ever seeing a reading of "0" on my meter. To cear
up the confusion there was no esr, nothing on the readout but the
indicator for power. Paul
Kevin wrote:
That is unusual. An esr of "0" indicates a good capacitor. What was
the value?
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
Sent: Tuesday, May 20, 2003 12:01 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: How does the TV know?FIXED
Sorry Kevin, esr was" 0" , out of circuit. Paul
Kevin wrote:
"0" esr or value?
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
Sent: Tuesday, May 20, 2003 10:36 AM
To: techassist@xxxxxxxxxxxxx
Cc: phil245@xxxxxxxxxxxxx
Subject: [TechAssist] Re: How does the TV know?FIXED
Hi Phil, You nailed it, C871 22@ 50V fixed it.I was sure I had checked
esr on all the caps on the pwr sply bd.Naturally I missed that one.It
read 0. It came on this morning after being unplugged over night.
Thanks again for putting an end to this nightmare. I am still however at
a loss to know why the isolated a/c supply would made a difference?
Everything else being equal.Just curious.Someone mentioned regulation in
the isolated was better as a possible reason. Paul
"Phillip R. Hull"
wrote:
I would replace C 871 22@ 50V Also D870 is very critical and I have
found dead units when this diode Zeners at .1 v high (04AZ36X) Part#
A7118305 Check the line voltage with Iso transformer and without. Its
probably different.
Phillip R Hull STET
phil245@xxxxxxxxxxxxx
FAX 517--569-3075
----- Original Message -----
From: "Paul"
To:
Sent: Monday, May 19, 2003 3:25 PM
Subject: [TechAssist] How does the TV know?
> I posted this problem last week for a Toshiba CX3586A that I am
working
on. This set will not turn on if left unplugged over night unless it is
plugged into an isolated power supply. I have measured both and they are
both 119V. I thought the problem was a 470@160V in the 115V supply. I
replaced it, checked (turn on) several times, put the back on,left it
unplugged over the week end. Tried it this morning no start. Plugged
into
the isolated pwr came right on. If left in the isolated pwr sply for a
few
min.,it then will work in the wall a/c. What is the difference? ac is
ac,right? Paul
>
> Paul ,B
Central TV&Video
Grover Beach Ca.
>
>
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