[TechAssist] Re: Sony proj. mod#kp46s15 ch scch53b-a bad red convergence -now no picture
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 14 Oct 2002 18:54:06 -0600
Richard,
This could also be a classic IK problem.
If it's in IK shutdown,....you can tell, by looking directly into the CRTS.
You will see a horz. line near the bottom of each CRT, that resembles a
Vertical problem (of NO vertical deflection), that's not on center.
Try turning the screens up a small amount on each of the CRTs. Even if only
ONE CRT is weak,...it will go into IK shutdown.
The NO red convergence problem, is a seperate problem. You will be back to
square ONE,...after your deflection returns.
Ask the customer if he messed around with the screen controls.
HTH,
LLW
LeRoy Westlund
Westlund TV & Electronics " It's such a pretty world
93 North Main today !....
Centerfield, UT 84622-0087 Look at the Sunshine. "
Ph./Fax 435-528-3822 :-)
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: Richard Lsa Placa <continentaltv@xxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, October 14, 2002 3:30 PM
Subject: [TechAssist] Re: Sony proj. mod#kp46s15 ch scch53b-a bad red
convergence -now no picture
>
>Hi
>I went on a service call to find a set with no red convergence. There was +
& - voltages at both fuses on the D board. I told customer I needed a
service manual to try to check the circuit. When I returned with the manual
the customer told me he unpluged the red plug on red crt yoke and turned the
set on and it flashed 3 times and now no picture at all.(phew!!!!---why me)
> I know this is an old post but i,m just hoping somebody familiar with
these sony projection tv's can help. I have what looks like the exact
vertical scope waveform coming out of pin 5 on the vert output ic and at the
red yoke. It is in series with the green & the blue. It looks like it gets a
little smaller at the green yoke and then a little smaller at the blue.
there is about 1.3 ohms from the bottom of the blue winding to the ground
and the combined resistance of all the yokes is about 12.9 ohms.The standby
led on the front pannel just keeps blinking ,which means there is no vert
.pulse getting to the protection circuits to turn on the video outputs.(good
thing).
>My question is why can't the yokes be driven by what looks like such a good
signal and if I have any problems in the convergence outputs will that stop
the circuit from running. There are no burnt parts, the fuses are ok, the
voltages are all within a volt according to the schematic.
> Richard Lsa Placa <continentaltv@xxxxxxxxx> wrote:Can anybody tell me what
could have happened to this vertical section after the customer unplugged
the vertical deflection plug (cn1413) from the crt's. (He thought he was
going to shut off the red gun and watch a clear blue/green picture).He told
me he heard 3 clicks when he pluged the set in with the yokes disconnected
and that was the end of the picture. I have a good strong vert pulse coming
from pin 5 at the output ic and at the yokes but only see a line.All the
voltages are pretty close to the manual on the output and convergence
stk's.Any help on this one would be greatly appreciated.
>
>Thank You!
>Richard La Placa
>Continental TV
>Chestertown MD,
>410-778-1113
>http://www.continentaltv.homestead.com
>
>
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