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

Holy crap, buy a new VCR!

Switch mode regulator shorted, and caps bad in supply, check Zeners in 
supply as well.

Mitsu projo: Caps bad on PIP module, remove module jump Y and Chroma lines. 
Sweat pins on Vert output IC.

I am new here,

Isn't this forum limited to technicians?

Is it a gp forum?


----- Original Message ----- 
From: "Dr. Mark" <meinn99@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, February 05, 2008 12:49 AM
Subject: [TA-A] Re: RCA will not power up


> Dear Techassist crew,
>
>  1. We were looking for a schematic and possibly a block diagram for the 
> power supply in a Panasonic AG-1960 VCR. The power supply is popping the 
> 2A, 250 V fuse closest to the AC in, and this will occur when the power 
> supply is unplugged from the rest of the unit. There is another fuse in 
> the power supply that remains intact. Does anyone have information on this 
> power supply?
>
>  2. Also, we were looking for schematics and block diagrams for a 
> Misubishi VS-5061 projection TV. The unit has a vertical stability problem 
> until it is warmed up for 30 minutes, then OK. We wanted to investigate a 
> few caps around IC201, IC202, and IC203. Does anyone have schematics and 
> diagrams for this unit?
>
>  Any tips are appreciated.
>
>  Thanks,
>
>  Mark
>
>  MC Mobile
> Telerama <TeleramaTV@xxxxxxxxxxx> wrote:
>  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)"
> To:
> 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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