Hantarex MTC-900 "Bluescreen"

[gavin.prior]

Hi guys,
I'm a long time member - been on and off for about 20 years or so now  - I've acquired a couple more cabinets since my last visit and one of them has a Hantarex MTC 900 monitor which has been fine for a while then started to have minor issues like the picture being a bit "jittery" and grey lines across the screen and now has gone completely blue.

Ideally I'd like to keep the monitor if it's a relatively easy/cheap fix but obviously there's a cut off point where it's just not financially feasible to do so. It's in a MAME cabinet and not in an original pacman cabinet or anything so could go TFT but like I said, I would like to salvage it if at all (financially) possible.

Gavin.

[gavin.prior]

Any monitor experts remaining? I just need to know if it's salvageable or if I should bin it.

Gavin.

[grantspain]

900 suffer badly from leaky transistors and corroded diodes in colour circuit
first thing to do is desolder the blue gun pin on the crt socket or lift one side of resistor on that pin, if blue screen is resolved then check/replace all diodes and transistor on blue circuit
is this a 900 or 900e or 900usa ?

[gavin.prior]

Hi and thanks for the reply

Not too sure on the model but looking from the back of the monitor, the left hand side PCB is PE06, the right hand side is DF04 and the neck board is NE04.

Does that help?

As you can probably tell, it's not my area of expertise but I did manage to discharge it without killing myself! 

Gavin.

[grantspain]

a photo of the chassis would be helpful

[gavin.prior]

OK finally got round to getting some pics. Hope they are OK?

[grantspain]

its a 900e, probably means you are in the uk or ireland

[gavin.prior]

Yep UK

[gavin.prior]

Another

[gavin.prior]

Back

[gavin.prior]

Neck

[grantspain]

i do fix these and i am in the uk
if you want to have a go yourself then the following need replacing/checking but first lift one side of R143 to check the function of the other colours
RV4, RV5
D10, D18
TR27, TR28, TR26
All of these are on the neck card, the diodes and pots often corrode and the transistors go leaky

There are components on the main chassis that also fail but in general its the neck card where the problem lies