[TV] Re: Mitsubishi CS3525R

["larry99" <larry99@xxxxxxxxxxxxx>]

Thanks to everyone so far.  I do not have an ESR but I was hoping that I
would see burnt or buldged caps in the power supply.  I don't do much (any)
repairs like this normally, I useally leave it up to the pros.  In this case
I thought I would play a bit since the set(s) are too old to justify paying
someone else to look at.  If I can fix it cheap I can hold out on purchasing
a new set.

I kind of figured that the problem is related to the (switching mode) power
supply since once the Mits is on it works fine (and on the Sony it is
completely dead, no life signs of any kind).

Maybe I will consider an ESR, it ought to come in handy on occasion but 1st
I will take them apart again and have a closer look at the power supply caps
and possibly replace the ones suggested and see what happens.

I was looking to this sight for your experience to help guide me to any
obvious know failure modes on these sets.

Thanks again, I will post my findings after I try the cap replacement.  All
information is very much welcomed.


Larry

----- Original Message ----- 
From: "lynnslb" <lynnslb@xxxxxxxxxxxxx>
To: <tv@xxxxxxxxxxxxxxx>
Sent: Friday, September 10, 2004 1:59 PM
Subject: [TV] Re: Mitsubishi CS3525R


> Hi Larry: I would check for bulged capacitors in the power supply, if you
> have an
> ESR meter that would be helpfull. You do know about SMPS don't you?
> A schematic would be a necessity on both TV's you are wanting help with.
> Here are some places to get a manual.
>
> http://www.servicemanuals.net/(o3h1q555dl55wmzjlvzgyh45)/Default.aspx
> http://www.samswebsite.com/photofact/pf_search.asp
> HTH. Lynn Blakely Moderator on TechAssist
>
> > ----- Original Message ----- 
> > From: "larry99" <larry99@xxxxxxxxxxxxx>
> > To: <tv@xxxxxxxxxxxxxxx>
> > Sent: Thursday, September 09, 2004 8:05 PM
> > Subject: [TV] Mitsubishi CS3525R
> >
> >
> > > I have a Mitsubishi CS3525R that has been in my family since it was
new.
> > The TV was manufactured in September of 1991.
> > > Once I get the TV turned on it works great, the problem is getting it
to
> > turn on.  When I push the power button it usually gives a 1/2 second try
> to
> > turn on, the green LED lights up for about that long or a bit longer and
> > then nothing happens.  If I keep trying it will eventually go on.  This
> 1st
> > happened about 2 months ago, I opened up the set and there are no
obvious
> > "witness marks" of where anything went out and no fuses are blown.  The
> > inside was VERY, VERY DUSTY as you have probably seen before.  I cleaned
> out
> > the inside, especially near the power switches, power supply and such
and
> > when I put it back together it started to power up normally.
> > >
> > > Now it is 2 months latter and I am back where I started but without
the
> 13
> > years of dust build up.
> > >
> > > As per my other thread on this site (for the Sony KV27T36), if it is
not
> > obvious yet, I am not a TV repair person but do have an electical
> > engineering background (but do not practice).
> > >
> > > Are there any easy obvious things to check / do that might milk
another
> > bit of life out of this set before I need to buy a DLP rear projection
TV,
> I
> > would like to wait until the current stuff is a bit cheaper or the next
> > version (4) comes out.
> > >
> > > Any help would be appreceated as this set is on its last leg and my
> other
> > set (which you will see in another thread) is already out.
> > >
> > > Thanks in advance,
> > > Larry
>
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----- Original Message ----- 
From: "Joel Heinz" <joe@xxxxxxxxxxx>
To: <larry99@xxxxxxxxxxxxx>
Sent: Friday, September 10, 2004 12:50 AM
Subject: Re: [TV] Mitsubishi CS3525R


> HI Larry
>
> The problem with your mits is the power supply capacitors are bad or weak.
> All you need to do is replace all four caps on the primary side of the
supply and the others on the secondary side.
> That will take care of your problem.
>
> As for the sony, you have either a bad power supply regulator or horz
output transistor. If the horizontal transistor is bad then you possibly
have a bad hv transformer.
>
> Later
> Joe
>

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