Help with Dead Eygo Monitor

[Mickey Juice]

I just moved into a new house and after moving my NBA Jam inside I've
got a problem with it. 

It initially fired up OK, the only questionable thing was that there
was a wobble in the edges screen, kinda like a degaussing wobble (not that
extreme) and it quitened down and wasn't noticible.

I turned the machine off for a few hours, then when I went to show a
mate I turned it on and nothing 


The game board is running fine, the LEDs are on and I can hear the
gameplay sounds. "Showtime!!!!" 

There is no glow from the back of the tube.. I tested the 2 fuses (6A
and 2.5A) on the chassis board and they seem ok (I dont have a continuity
test on my multimeter, so I just used resistence, and the meter was zeroing
ok,  so I assumed there was connection through it).

After leaving it in a repair place for 4 weeks without them even *looking* at it, I got it back from them 

I pulled out the monitor chassis last night and had a look.

The only bad solder joint I could find was on the monitor neck board...
It was the (E) pin that connects to the wire harness around the monitor.

I havnt plugged it all back in yet, but would this be part of the problem?

I've been told that it's probably a switch mode power supply problem or a problem in the deflection circuit, someone else mentioned the B side transistor is prolly dead.

I dont have the equipment to test the transistors whilst in the board.

The brand of both the chassis and tube are Eygo.

[censei]

Since you don't have the tools to test the components, maybe you just want to purchase a new chassis from Alva Amusements, the 25" std res Wei-Ya chassis and forget about the repair? If you want to repair it, you should inspect the chassis for bad/cold solder joints. I believe it's just probably a bad capacitor, most likely the one right next to the big ceramic resistor/vertical ic, but also check the 2 transistors mounted.

[Ken Layton]

Looks like it's due for a capkit too.

[Mickey Juice]

Thanks,
I'll replace all the caps and go from there.

Is it possible to check the trannies with a DMM, while still in the board??

[SirPeale]

Thanks,
I'll replace all the caps and go from there.

Is it possible to check the trannies with a DMM, while still in the board??

Yes.

[Mickey Juice]

So the method of using the diode test should be ok? ie between Emitter > Base, Base > Collector?

I'm gunna do cap kit, but I still suspect the transistors... but im not 100% up to scratch with testing them. I'll have to do some more reading.

After writing down all the values of all the caps, I tested all the diodes. 1 gave a reading both ways, so i'll replace that and another one broke all together! So i'll replace those two and test.

The broken diode:


The broken diode (top right)
and the non-working one (left)

[Mickey Juice]

I got this back from a repairer yesterday... There's now power to the board (I can hear the flyback transformer) and some static around the anode plug..
but no glow from the monitor neck  at least im getting a bit closer.