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52" Magnavox projection TV No Power

V

Vetsen

Jan 1, 1970
0
MODEL # RK8568 AK02

Unit won't power up. Fuses are good. The modules are getting 120 AV.
Is the Power Supply bad? Easy fix? Power supply # CTN 6220. I
don't have the chassis #.

Vetsen
 
A

Art

Jan 1, 1970
0
Common problem has been the LOPT and associated circuitry
 
V

Vetsen

Jan 1, 1970
0
POPT?

Sorry, I guess I should have said that I am pretty new to TV repair.
I am more familiar with audio stuff.

Could you elaborate a bit for me?

BTW that was supposed to be 120V AC in my first post
Vetsen
 
V

Vetsen

Jan 1, 1970
0
sorry about my typo. I'll get the hang of this keyboard sometime...

Vetsen
 
T

Tim Kettring

Jan 1, 1970
0
I AM a techinician ( 30 years ) with 5 CETs and FCC liscense and permit . I
have not fixed TVs in 20 years though .

Do you know what Transit Time Dispersion Factor refers to ? I do .
 
A

Art

Jan 1, 1970
0
Sorry Mate: These flippin things have changed just a bit in the last two
decades since you had your pinkies into them. Maybe you are in a bit over
your head, IMHO.<
 
J

john

Jan 1, 1970
0
Yea Right...
So what has that got to do with Vetsen,s post

kip

Ps: "Is it related to Dimension Drive Engines" ?
If so yes I know I do..
 
V

Vetsen

Jan 1, 1970
0
So I had a question about a rear projection TV. It doesn't work. I
think it's the power supply. Is this the propper place to ask how to
fix it? Seems like there are other forces at play.

Vetsen
 
J

john

Jan 1, 1970
0
Yes this is the place ,Vetsen first what
trouble shooting have you done so far.
What voltages do you have tell us more !

kip
 
V

Vetsen

Jan 1, 1970
0
There is a little board called the "AC Panel" or something like that.
where the mains power comes in, and goes to all the other modules. I
have checked the leads to every module that I can get to and they all
have 120V AC. That's all that I could figure out without a schematic.
My guess is the power supply. I have also heard of the RAM battery
being bad, but doubt that it's going to be that easy. It wasn't
obvious how to replace the battery so I haven't tried that yet. I'll
do a little more probing and post soon.

It looks to be a switching type PSU, which I don't know so much about.
I build PSUs all the time using voltage reg. filter caps and
transformers. I did see what looked to be bridge rectifier in the
form of 4 diodes, but maybe it was a voltage doubler or similar.

Thanks,

Vetsen
 
V

Vetsen

Jan 1, 1970
0
any ideas. I'm about to pull out the audio amp and speakers and junk
this heap. any one have any ideas before I do it?

Vetsen
 
B

BWL

Jan 1, 1970
0
Uh, a little more info would help with our advice; chassis #, model #, that
sort of thing...
 
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