Introducction and vertical line on my screen

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 6:48 pm

Hi all!,

I 'm Querubin from Spain. Newest private owner of a Naomi universal cabinet from 2001 made in UK with a naomi2 gd-rom system and the game Beach Spikes (2002). I have no clue about the possibilities of this machines and hope to learn from you what the best to do with it to me.

I think it has a Sanwa 29E31S monitor and need to be repaired. May be you can help me.

Nothing appears on the screen when is powered on. But when you unplug the VGA connector a vertical line appears in the middle of the screen.

I have tried the VGA wire on a PC display and the game works ok.

I thing is a problem on the horizontal output but I'm not sure about that and neither how repair it.

Can you guide me to find the problem and solve it?

Thanks in advance and excuse me my poor english.

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 7:04 pm

hola,

where in spain do you live?

normally a horizontal line across the screen will either mean component failure in the vertical deflection circuit or a bad connection to the yoke

if its a vertical line going down the screen then its most likely a bad solder connection on the flyback or yoke

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 7:08 pm

Hi grantspain.

What fast!!

I live in Murcia.

The line is vertical.

Can you be more specific on how to repair it.

Thanks very much.

Have you got any relation with Spain?.

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 7:29 pm

yo vivo circa malaga pero soy ingles :smt006

tengo trabajo con una empressa internacional,no hablo mucho espa?ol

normally the problem will be a bad solder joint,for example if you bang the side of the cab do you get an effect_

usted hablar ingles muy beuno hombre

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 7:46 pm

Perfecto, tu no hablas mal el espa?ol tampoco. Poco a poco.

I will try to take the chassis out and resoldering all the components. I will comment what happens with that.

Muchas gracias.

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 7:47 pm

look at the flyback transformer and yoke plug connections in particular

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 8:14 pm

Ok, I can't locate the flyback transformer exactly but I will resold everything.

An observation. I checked the D401 component (It can be seen on the manual). In the manual sais that is a diode but it is indentical to a transistor.

When I have checked it the center and right pins are communicated and the multimeter beeps. If it is a transistor is bad, and if is a diode I don't know.

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 8:22 pm

don?t resolder everything as you only need to check the obvious bad connections

the flyback transformer is also know as a lopt,it has the focus control

d401 is a diode in a different package and it will read in circuit

do you know how to remove a monitor chassis correctly

OldFoo · Post by **OldFoo** » Sun Nov 30, 2008 9:53 pm

Ok, I understand.

When I resolder the flyback transformer and the yoke connections will tell you the results.

Thanks for your good help amigo.

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 6:20 pm

I again.

Resolded flyback and connectors and no changes.

I have been testing different transistors and the Q412 (horizontal deflection output) is in short (Is say this in english?). Whatever of three pins I test my multimeter beeps. I think replacing it all will be solved. Could I be on the right way?. Is there any other component associated to this transistor a resistor or something I had to replace too?.

Thanks.