SONY KV-32S40 32" Trinitron screen distortion bowtie

- G
- gfgray
  
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posted
18 years ago

Sat, Mar 4, 2006 1:42 AM

The bottom half of my screen intermittently shrinks like a bowtie and sometimes the picture would just disappear. Giving the TV a good smack fixes it. Then, after the TV warms up, the problem no longer intermittently appears.

I resoldered a bunch of connections. Now, when I turn the TV on, I get the degauss sound and the power light blinks like it normally does during warm up, but the picture never comes on. When I was resoldering, I found a spot that looked like sony spilled some solder and may have shorted two connections on the mainboard. I cleaned that solder off. Could that have been an intentional solder connection on this TV model?

Also, I pulled on that thick red wire that goes from this transformer thing on the main board directly to the picture tube. I then realized it wasn't supposed to come out of the transformer thing. TIA

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- J
- JamesQB
  
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posted
18 years ago

Sat, Mar 4, 2006 4:01 AM

Was it a solder splash that rubbed off, or did you melt and remove the solder across the two connections? It sounds like you may have removed a solder link that should be in place. If the solder was making good connection between the two areas it was bridging, then it's a simple of case of logic: if the set was working fine like that, then it wasn't an accidental solder splash, or something would have been malfunctioning from day of production.

As for the lead you pulled on, that's the EHT lead that carries several kilovolts to the CRT anode. I would avoid messing with this lead. Did you pull it partly out of the transformer or something? If you didn't pull it from its catches, then I doubt you've done it any harm, but make sure you haven't partly pulled it out and that the anode cap at the other end of the lead is still properly in place on the CRT, but be very careful as the tube capacitance means that there is still dangerous and painful high voltage present sometimes even days after last having the set on!

It may be best to have an engineer look at the set if you aren't sure what's what. There are other parts which store a good deal of voltage for long amounts of time and can be either bloody painful or at worst dangerous. I personally think that for someone to try repairing their own sets, they should have at least basic knowledge such as knowing what the flyback transformer is and does... etc. That way they can stay a bit safer.

- R
- RDC
  
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posted
18 years ago

Sat, Mar 4, 2006 5:02 AM

Those Sony sets are notorious for having bad solder joints that can kill the Power Supply and/or H.O.T. Ceck and see if the H.O.T is shorted and then resolder everything that leads up to it, driver transistor, transformer ect. Check the power supply for shorted transistors as well as as an open resistor, R607.

Pulling the Anode wire (big red wire) out of the "flyback transformer" is EXTREMELY dangerous. Even if the sets been off for awhile and is unpluged the tube still has a charge in it. You may want to leta tech handle the rest of the repairs before ya discover the shocking side of TV repair.

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RDC