Help with weird problem, video does not sync Hitachi GMK-29FJ

[abispac]

This must have to be a weird problem, after having so much problems to get 15khz out of my video card, i notice a weird problem. Its a Mark IV candy cab with a 25 phillips monitor. all seems allright but proble is  if i open the main compartment, the one to take a look at the controller and monitor, the video automaticly stop sync, i get a scrolling and twisted image, but if i close the lid, everything its allright, i have looked for loos grounds, i even rebuilded the whole harness and the problem seems to persist, so im just afraid that the monitor its goin to get broke for this, so im looking for help to see if i can fix the problem... thanks for any help

Edit to add chassis brand and picture.
 Hitachi GMK-29FJ

Not my picture but its identical to this one

[grantspain]

i would check for bad solder joints on the remote board,also try tapping the cab to see if it affects the picture
is this a pony mk IV?
phillips is the tube not the monitor chassis

[abispac]

i would check for bad solder joints on the remote board

Wich its the remote board? the one that ataches to the tube?

try tapping the cab to see if it affects the picture

yes it does, but you need to tapp not real hard but not to wimpy...in fact playing robotron (the one game that esstreses me) sometimes the picture gets all scramble, but hitting the controls turn the picture back to normal.

is this a pony mk IV? phillips is the tube not the monitor chassis

Yes it is a pony mk IV cab, and sorry about not noticing the diference betewn the tube and the chassis. i will look for the chassis brand, thanks you.

[grantspain]

the remote board is the one with loads of pots for controls like horizontal hold etc

sounds almost certainly to be a dry solder joint

[abispac]

the remote board is the one with loads of pots for controls like horizontal hold etc

sounds almost certainly to be a dry solder joint

gotcha...ill chek that out too see if i can solve the problem, thanks for the tip.

[abispac]

Problem solved, it tur out to be a loose ground, found the ground atached the ground and no more monitor problem, thas for the help anyway...