[TA-A] Re: RCA will not power up

Terry,
First, this chassis has no relay "click" when plugged in. The 195 will chirp 
when first plugged in. If you hear that chirp, the supply is running.

There are so many things that can kill a set. It is true that this chassis 
has had bad flybacks. There are two flybacks for the 195. The 239111 version 
is the one that failed. We do work for three shops, I have NEVER changed the 
other type (250694), always the 239111 one would fail.

If there is no short on the B+ line, and there is nothing wrong with IC2bus, 
and all standbys are ready, the set will fire, or attempt to fire even with 
a bad flyback. The set will shut down with a bad primary or secondary 
winding in the flyback.

About 30% of the 239111's I have changed had no primary or secondary short. 
There was a breach in the housing of the transformer. In other words it 
would arc, and in most cases short the HOT.

If you are not skilled, it can be very difficult locating a corrupted data 
or clock line on the bus. I have had on several occasions with the 195 and 
197, surface mount caps that were loading the clock lines.

You need a schematic, DMM, O-scope (in some instances) and of course, some 
level of skill and knowledge.

Tony,
Telerama Television


----- Original Message ----- 
From: "Conley, Terry W (Hazard)" <terry.conley@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 04, 2008 2:39 PM
Subject: [TA-A] RCA will not power up


>I would really appreciate some advice on an RCA Model P52960 rear
> projection TV.  It has chassis PTK195Y06B.  This television was donated
> to my church youth group and it will not power up and I hear no relay
> clicking if I connect it to A/C power and try to turn it on (also, the
> buss-type inline fuse is still intact).  I assume it is in the primary
> power supply and would like to have some advice on the most commonly
> failing parts in that area.  I have done some research and feel pretty
> sure that I will need to change the flyback transformer, but would like
> to know other common weak points.
>
>
> Thanks,
>
> Terry Conley
>
> Terry.conley@xxxxxxxxx
>
>
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