help with monitor - faulty?!?

[WhiteComet]

Hi
The monitor works for a few minutes then goes like video shown!

is the monitor faulty or could it be a loose connection?

[youtube]http://www.youtube.com/watch?v=98HDODkGXO8[/youtube]

Any help appreciated.

[grantspain]

looks like it losing sync,is this pc based system or jamma cab?
it could be something as simple as a dry solder joint on the input plug or it could be more complex,you need to give some more info on the setup and the monitor model/make

[WhiteComet]

its a playchoice 10 machine.... so I guess a for of jamma.... it has twin screen... top screen selects the game out of a list of ten, bottom screen plays it!! Top screen is faulty!!

Make: Hantarex
Model: MTC 9000

[grantspain]

i worked on lots of these,has the machine just started doing this?

[WhiteComet]

yeah... it starts off fine for about 5 mins if its been turned off for a few days then starts flicker and making a whistle!

[grantspain]

most likely problem is dry solder joint on the chassis,whats happens when you tap the side of the cab?

[WhiteComet]

ill try tomorrow its late atm.... ill post in the morning...

[qrz]

schematic @ www.freeinfosociety.com/electronics/schemview.php?id=2245

if 130v reg is holding steady , check c34,35, c16,20, 22.
 and pending sync polarity, check c17,18,19

a can of freeze spray can help locate those pesky thermal intermittents 

qrz

[WhiteComet]

schematic @ www.freeinfosociety.com/electronics/schemview.php?id=2245

if 130v reg is holding steady , check c34,35, c16,20, 22.
 and pending sync polarity, check c17,18,19

a can of freeze spray can help locate those pesky thermal intermittents 

qrz

ok that made no sense to me!!

new try... I turned it on this morning... worked for like 3 minutes then started again... tapped the side of the cabinet 'nothing happen' so opened the back compartment up and gave the the screen a small push to the left and its been running fine for the last 10 minutes!!
so this means.....

[grantspain]

you either have a bad solder joint on the chassis or a bad connection on the video input,if i remember correctly the video signal goes to an inverter board first which is mounted to the left of the chassis
just make sure all the plugs are home
next step is to find someone with a bit of soldering/electronics experience to check the monitor chassis

[WhiteComet]

ok..well ill take some pictures of the monitor if that helps?

in terms of it being a bad solder joint... is it the matter of looking for a joint thats loose/broke and then re-soldering it?

[grantspain]

i don't need to see a photo,i worked on hundreds of these monitor type
start be locating the sync wire,you will see a green plug with 5 or 6 wires coloured red/green/blue/black/white and possibly yellow
the white and yellow are sync wires,try wiggling the wire at the plug of the inverter board and the main chassis video plug to see if it affects the picture
as for bad solder joints you would need to have experience to know what you're looking for,don't attempt this if you are not familiar with monitors as you could get a nasty shock or damage the chassis-get a pro in

[WhiteComet]

ok
thanks for all the support

finally.. how often do these small monitors come up on ebay/for sale? and what price they normally go for?

[grantspain]

ok
thanks for all the support

finally.. how often do these small monitors come up on ebay/for sale? and what price they normally go for?

like rocking horse poo,they a real rare-never seen one for sale
you can send for repair to hantarex or others