Introducction and vertical line on my screen

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 7:14 pm

can you upload a photo of the screen first

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 7:47 pm

May be a video is better.

http://es.youtube.com/watch?v=F18wvXvyX4Q

At first all is black. Then, when you unplug the VGA connector you can see this on it.

ps: Have this forum youtube tags?[ youtube]video[ /youtube]?

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 8:08 pm

first check the controls board under the button panel is connected correctly

then check q412 ,r456,vr455 to start with

also meter the horizontal yoke make sure you have 0.6 ohms

this is a rare fault

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 9:42 pm

i think unless this problem is something unplugged then i do not think you will fix this

i am based in marbella and could help to a certain degree

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 10:35 pm

I will check all you have said. Then I will change the Q412 if finally doesn't work I will have to take it to sat. It is funny to me to try do it myself.

I'm very happy with your help. Without it possibly I was thinking nobody wanted to help me.

Thanks for all your help. I will say my progress.

OldFoo · Post by **OldFoo** » Tue Dec 02, 2008 11:45 pm

por el momento tengo vacaciones,yo volver en dos semanas(martes 16th dec)

OldFoo · Post by **OldFoo** » Sun Jan 11, 2009 1:32 am

Finally fixed on a TV reparation service. Was the horizontal deflexion circuit. Probably easy to check but impossible to me.

Thanks for the help.

OldFoo · Post by **OldFoo** » Tue Jan 13, 2009 3:48 pm

Querubin wrote: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.

If you have a line on the screen this this transistor will be good. The horizontal section drives the high voltage to make the screen work. If it's shorted then you'll have a blown fuse and no high voltage.

It's normal for a horizontal output transistor to read shorted when in circuit. You are reading through the flyback transformer or through a horizontal drive transformer.

RJ