293E1S Naomi Monitor Cutting Out

[tb2000]

es31 use shanghai novel tubes, unless someone has done a yoke swap

I thought that but the original Sega sticker in that pic does say 'Model Name 29E31SJ' on it. Must be a bit rare to see a 29E31S using a Toshiba crt from the factory?

 

[gunblade]

never seen that

 

[Goodwinsplace]

Do you think the BSC24-0107 is still right?

 

[gunblade]

yes as thats the es31 flyback
the only one available is from tecknoservice, you will get some odd interference which is affected by brightness but like tony said better than a non working monitor

 

[Goodwinsplace]

Thank you both so much.

I'll get a new flyback on it and update.

 

[Goodwinsplace]

New flyback fitted, had to move a jumper also according to instructions.
Powers on get output from system then shuts down. Using an Xbox 360 on VGA connection to test.

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Have screen set half way on flyback pot.

 

[gunblade]

screen pot set to near minimum, remove vga - does it stay on?

the last batch of tecknoservice flybacks i got did not require the jumper move

 

[Goodwinsplace]

Yes can get this with no signal going to it and adjusting the screen.

 

[gunblade]

is that the screen volts at minimum?

 

[Goodwinsplace]

is that the screen volts at minimum?

Under half, but not right down.

 

[gunblade]

well turn it down until picture is almost black then retry vga signal

 

[Goodwinsplace]

well turn it down until picture is almost black then retry vga signal

Just tried it with it down to where I can barely seen the screen. Powered on the signal to VGA and the monitor cuts out.

I have the chassis just on the single metal plate not the secondary one that connects to the frame, assume that is ok?

 

[gunblade]

sounds like an issue with the res from the xbox, do you have anything else with 31khz signal

 

[Goodwinsplace]

I've also moved the chassis before putting in the VGA and it's cut out. If that suggests anything on connections too?

 

[Goodwinsplace]

sounds like an issue with the res from the xbox, do you have anything else with 31khz signal

I've used it before on this monitor, but will use a signal from a pc that I have running in another Naomi tomorrow.
I don't have any original Naomi hardware here now.

 

[gunblade]

same fault you had with original flyback?
you must have a bad connection or solder joint somewhere

 

[Goodwinsplace]

same fault you had with original flyback?
you must have a bad connection or solder joint somewhere

Old flyback wasn't powering up at all in the end. I've gone over pretty much all of the board with fresh solder.

Power connector or short somewhere? They all seem to have a decent connection at the monitor but not followed them back.

 

[gunblade]

you would need to go into much more in depth monitoring of b+, vertical ic vcc and eht
if its a bad connection then you should be able to tap the chassis and cause the issue

 

[Retroman839]

Is your Xbox vga resolution set to 640 x 480 ?

You might have it on 800x600
29e won’t go above 640x480

 

[Goodwinsplace]

Is your Xbox vga resolution set to 640 x 480 ?

You might have it on 800x600
29e won’t go above 640x480

I'm pretty sure it will have kept those settings from previous but it could have reset as it's not had a display when powering on for last few times.

I'll use the PC that I know is fine and working on my other Naomi cab.