New Net PD1843

[cruzlink2]

Went to my buddy's dojo yesterday to fix a previous patch work on his pd1843 neckboard that had lost the color green. When the chassis was originally shipped to him the neck board cracked slightly and he had someone patch it. I went over the patch work and decided to tidy it up. After tidying it up and verifying all connections with a multimeter we attempted to power up and got arching at the anode cap and immediately shut it down. I figured that was because the anode was completely devoid of dielectric grease so he went to get some, we tried again with the grease and got no arching but also got no power on the flyback. The chassis would sound as if the power is on and you hear the normal hum of the power supply section working but you would not hear the flyback energize. We turned off the light to see and got some good neck glow but no image. Any advice is greatly appreciated.

View: https://www.youtube.com/watch?v=fuPEDqomiX0

 

[cruzlink2]

Bump

 

[cruzlink2]

Damn no one ever really answered this... Well no matter anyways, I tried another chassis we got for cheap but that didn't work either. Thought it was the tube so we got a donor TV to transplant. Day of the transplant I tested the tube with a BK 490 and the tube was good aside from a bad green gun which came right back after a clean and restore pass. Since both arcade chassis were non operational I decided to throw the consumer set tube with it's chassis in there and it worked out good. We set the original tube and chassis aside inside the consumer set shell, eventually when I get the arcade chassis working we will yoke swap and put them in. The consumer set tube somehow turned out to be the exact same tube as the original new net tube.

 

[cruzlink2]

Done.

View: https://youtu.be/b65ZdMt08JU

 

[trashedcabs]

Firstly--you are very lucky to find any Toshiba Japan 68cm tube in a TV in the states! They were all over Asia but very few made it here.

I have two PD1843 chassis on the bench right now with HV issues I haven't been able to solve yet. One of them has runaway HV that is triggering xray protection, and the other keeps blowing Q412. If Q412 is missing, the monitor will operate normally with no HV. Maybe check to see if that's blown on yours?

 

[cruzlink2]

Thank you sir.