Mac 128k screen image compressed on one side.

[Tinkerer of things]

So here is where I'm at with this, When I got it it did nothing I replaced it's flyback transformer and a BU406D transistor. Last night I replace all the electrolytic capacitors hoping that would fix it, but no luck. Anyone have any ideals?  I should also say tryed tweaking the dials on the back side of its analog board.

Thanks

 

[IlikeTech]

Was the transistor you replaced the HOT?

 

[techknight]

If the BUD transistor is the HOT, thing you have to make sure of is that you replaced it with the exact same transistor. Substitutions generally dont work in circuits like these as its a tuned circuit. 

Besides that, the yoke could be bad. Inspect it. 

 

[Tinkerer of things]

If the BUD transistor is the HOT, thing you have to make sure of is that you replaced it with the exact same transistor. Substitutions generally dont work in circuits like these as its a tuned circuit. 

Besides that, the yoke could be bad. Inspect it. 

Thank you, I will have a look and swap out the BUD again. 

 

[Tinkerer of things]

Was the transistor you replaced the HOT?

Yes, its heatsink was actually discoloured.

 

[techknight]

ouch. yea theres some issues going on there. the transistor is being overloaded potentially. Also, check the damper diode and make sure it isnt leaky or shorted.