monitor Is it completely knackered

[DonAmiga]

My unit just fell of the wall is my monitor knackered?

[Toni Wilen]

Most likely something simple like broken connections or damaged circuit board.

Problem is missing vertical scanning (no signal to vertical coil around the tube). Whole image is compressed to single very bright line.

Tube is probably fine (but damage like warped dot mask may only be visible after vertical is fixed), high voltage circuitry is fine.

DO NOT USE IT! Turn the brightness down immediately or phosphor will burn. Very bright line can become very dark line, permanently.

[DonAmiga]

Thanks Toni

I'll open it up to see if there's anything visible

[FOL]

Originally Posted by DonAmiga

Thanks Toni

I'll open it up to see if there's anything visible

My bet is the lotp or the lotp transistor.
Toni is right, looks like line scanning fault.

Check the Line Output Transistor for visable damage. If you have a multi-meter, check the pins of transistor to see if its short circuit.
Could be the Line Output Transformer has gone and taken out the Transistor.
Be careful though as they can store voltage on the caps, which can give you a nasty belt (trust me, ).

[Toni Wilen]

Originally Posted by FOL

My bet is the lotp or the lotp transistor.

No, it can't be LOPT. LOPT creates both horizontal scanning and high voltage. Obviously both horizontal and high voltage is present

Check vertical coil wires and PCB around the coil connector that is _not_ near big and strange looking transformer.

[FOL]

Originally Posted by Toni Wilen

No, it can't be LOPT. LOPT creates both horizontal scanning and high voltage. Obviously both horizontal and high voltage is present

Check vertical coil wires and PCB around the coil connector that is _not_ near big and strange looking transformer.

Doh, you are correct. Been out of it for awhile, . Really miss fixing consumer electronics.

Frame collapse is what I was supposed to be thinking off.
So would be worth checking the Frame circuit. Could be frame IC dead or a feed to it, could be something as simple as dry joints.

I think Toni is talking about the Tube neck board?
Be nice to see a manual, another think I miss, working through circuit diagrams to find faults.
Nothing like a manual folding out into a massive page on the desk.

[DonAmiga]

cheers for all the info

Just clearing everything up then I'll get the monitor out onto the kitchen table for some space so I can have a good look inside Staying positive hopefully can fix it

Meant to say the model is a Idek Iiyama MF-5017

[DonAmiga]

Hi cant see any visible damage, maybe if someone could have a look and point me in the right direction?

Link to photos

https://picasaweb.google.com/1099617...eat=directlink

Thanks

[FOL]

Originally Posted by DonAmiga

Hi cant see any visible damage, maybe if someone could have a look and point me in the right direction?

Link to photos

https://picasaweb.google.com/1099617...eat=directlink

Thanks

First sugguestion is check for dry joints (some cases arching marks) on the board (solder side).

[Toni Wilen]

Disconnect vertical coil connector and use DMM to measure resistance (should be quite small, 50 ohms or less I think). Confirms if coil is bad.

But I don't think the coil can get damaged so easily.

[DonAmiga]

Thanks

I'm setting up a table in the spare room so that I can strip it all down and spend the time working on it without it getting in the way as its on the kitchen table at the moment and there seem to be a lot of dismantling to do just to get right in about it

I pick up localy a 21" iiyama vision master 502 its huge I wasn't sure if anything could be used from it and it was only £5

Cheers

[Jope]

Probably not a yoke problem as has been established, it's just copper wound around a metal core after all. Most likely you have broken solder joints around the vertical deflection circuit.

[keitha1200]

Originally Posted by DonAmiga

Thanks
I pick up localy a 21" iiyama vision master 502 its huge I wasn't sure if anything could be used from it and it was only £5

Cheers

Very nice I've trying to get hold of their 'touch-screen' version for ages (for my youngest), crazy prices on ebay

[DonAmiga]

just to update, I tried re-soldering the joints on the vertical ic chip which didn't work so I've ordered a new ic chip hopefully that will fix it

[FOL]

Originally Posted by DonAmiga

just to update, I tried re-soldering the joints on the vertical ic chip which didn't work so I've ordered a new ic chip hopefully that will fix it

Its also worth having a good visual inspection of all boards.