Sony KP-57WV600 Blue CRT driver board

Bahdabing · Guest

Hello everyone. My dad bought a KP57WV600 tv that had a known convergence issue with the red CRT. I've since repaired that problem by adjusting the voltage pot for the red crt. After that though, the picture still didn't look right. Things that were supposed to be blue were greenish and things that were supposed to be white were yellow. Because of that, it appeared that blue CRT was not on. I opened up the back of the TV and sure enough, it wasn't. To make a long story short, I do have voltage to the CRT drive board, but there are at least 2 blown components on the board. So, I'm assuming at this point, the board is blown and this is the reason the blue CRT is not coming on. I'm an electronics student in my final semester at school, so I know a little about what I'm doing on the boards . However, one of the components that is blow on the board, I've never seen before and do not recognize the schematic symbol. I brought the schematic to one of my instructors along with a picture and he said he thought it was a indicator lamp. In my schematic manual, the lamp is listed as NL9302 and says 80V below it. The other component that is blown is the 1k, half watt resister that is in parallel to the lamp (R9323). The 1k resistors are easy to get a hold of. The lamp on the other hand, I'm not sure where to get it and even then, I don't know what amperage it needs to be.

So A) does anyone possible have a good CB CRT drive board p/n 1-685-260-11 board I could buy or B) does anyone have an actual part number for that lamp and/or know where I can buy that lamp and what the correct amperage is on it?
Thanks a bunch!

jts1957 · Joined: 24 Nov 2008 Posts: 2476 Location: Far, Far Away

NL = Neon Lamp.
80V if I remember correctly is the voltage it "comes on" at. It is used similar to a spark gap, for excessive voltage.

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Guest · Posted: Tue Dec 16, 2008 2:34 am Post subject:

I ordered a new board instead of replacing the lamp and resistor. I just installed it and as soon as power was applied, the lamp came on, and the resistor started smoking Mad

Now i'm not really sure what to do. Any suggestions?

bahdabing · Guest

A buddy of mine came over to look at the tv. He knows a little about tv repair. He swapped the high voltage line to the blue crt with the green one. When the tv was turned on, green came on and blue still did not so looks like the blue CRT is dead? I tried looking this part up and the places I found do not carry the CRTs any more. Is there a place that will carry those or is the tv kind of lost cause now?

jts1957 · Joined: 24 Nov 2008 Posts: 2476 Location: Far, Far Away

Get the type number of the tube and ask local repair shops, one might have.
People abandon their sets once they hear the cost(s) to repair. Shops throw out sets if they don't want to invest in fixing them themselves.
A lot of sets will use the same tube number (especially SAME brand &/or around the same vintage).