eMac Display Problems

[CBM1084]

Hello,

I recently purchased an eMac on ebay that was listed as "in great working condition", but when it arrived it was in fact not working properly. The computer itself seems to work fine but the display is completely distorted, shifting and flickering constantly so with half the picture off the bottom. From my understanding, the capacitors in these eMacs can often be a problem, but I'm wondering if anyone has any information on which components in particular might be at fault here. I haven't been able to locate any schematics or specific information about the anolog board in this machine. I'm hoping someone might be able to point me in the right direction with this repair.
Here's a clip of what it's doing:

The main question of course is whether this is something that is reasonable enough to fix, or if I should just return the computer. I'd rather not ship it again if I can avoid it, but if fixing it will prove more trouble than it's worth I may have to. I'm comfortable enough working around the CRT but without any details about the electronics and what specifically might contribute to this problem, I don't really know where to start.

This eMac is a 1.25 GHz model with 256 MB of RAM.
I'd appreciate any help trying to solve this.

 

[GiGaBiTe]

These machines were right in the middle of the capacitor plague, plus they're hot boxes with a smoking hot CRT baking everything with poor cooling. So yes, you'll need to recap the entire machine.

But the distortion is more likely caused by failing solder joints. The machine probably did work when the seller shipped it, but it being banged around in shipping likely caused the bad solder joints to partially/fully disconnect from the PCB.

You'll have to treat the eMac like the first compact Macs, all of the solder joints will need to be reflowed and/or desoldered and resoldered.

When you get the machine apart, look at the solder joints. If you see any that are yellow, or have rings/cracks in them, you'll need to fix them. I would do all of the joints like I said, because microscopic cracks that can't be seen are common, or the solder just lets go of the pin and oxidation forms between the pin and the solder that causes a bad connection.