Horizontal collapse issue

[VodkaGobalsky]

Hi, my monitor MS8-29 started exhibiting horizontal bending issues on turning on the machine. It stays like this for a good 5-10 minutes before it becomes normal again. What could be causing this? This started happening after my machines were moved from my house to a venue.

View: https://youtu.be/Wvknjq4y7bo?si=0v_ycAkkCepDPrDe

 

[nem]

My guess is solder joints.

 

[VodkaGobalsky]

Yeah that’s my guess too but not sure which ones.

 

[nem]

Start by checking the joints for the pots related to geometry on the chassis. Then around that vicinity. It's basically all in one corner of the board.

 

[VodkaGobalsky]

I think I managed to fix it. I've only turned it on once after servicing it but we'll see if it holds. Good sign is that it looked right after turning it on and didn't come up with the sides being caved in.

View: https://youtu.be/TdGR5_q5mgk

 

[VodkaGobalsky]

I spoke too early because I just turned it on again yesterday and it’s still happening. Tapping the side of the arcade seemed to make it go back to normal, could something be loose?

 

[Mukuro_W]

Desolder the custom PCB mounted vertical, the one with trapezoid trimmer, check for broken solder joints on the PCB male pins , this PCB directly influence the pin amp circuit , the pincushion amplifier is mounted on the rear of this PCB, just mounted on the heatsink. Check all solder joints also on H driver trasforner.