Unfortunately there's no physical controls inside this TV whatsoever, aside from the G2 and Focus pots on the flyback itself. The service menu does have some controls for vertical linearity, but I'm actually having trouble with horizontal linearity, as best I can tell. For reference, here's the 240p Test Suite grid pattern, and here's the scroll test. (Apologies for the flashing in the video; I could not get a clean recording to save my life.)vol.2 wrote:The geometry issues sound like it might be vertical linearity. If you can't access that in the service menu, it would be worth looking around on the motherboard. In fact, if you can find any physical geometry controls at all, it's probably best to set the service menu at mid-way and adjust the physical pots until it generally looks good.
IAC, to adjust linearity, you'll need the grid pattern, and you can measure the height of the boxes in the grid, adjusting to make them all as equal as possible from top to bottom.
I did end up replacing a fair few capacitors, and that did help with some stray geometry issues that the display had, but didn't do much if anything for this linearity issue. I'm afraid at this point I might just have to deal with it as the price of using a flat CRT.vol.2 wrote: You can narrow down caps that you might want to replace by sections on the board. The flat screen CRTs are more difficult, and I don't think caps are always the problem there. Sometimes the LOPT gets weak, or some other part of the system starts to wear. However, you can probably improve the geometry at least a little by checking and replacing any out of value (20% or more) caps in the Horizontal and Vertical sections, and anything electrolytic that's directly coupled to the LOPT (if there is any).
You don't need to mess with anything in the control electronics or the tuner section as that stuff is probably fine and doesn't see much heat or wear. the most suspect things are small caps that are near hot component, as those tend to dry out. That's mostly around the HV, and the power section near any big transistors/heat sinks or any banks of power resistors, and especially anything near a spot on the PCB that looks burn in any way.
I'm also seeing the same problem that it seems is fairly common with RGB displays in general, where the image is offset to the left in RGB mode. (See the above screenshot, as well as the PlayStation boot screen for reference.) While the service menu does have an option for horizontal shift, that option only seems to work for composite input. It doesn't have any effect whatsoever on RGB. Interestingly, some games I've tried on this TV have a screen-shift option that allows the picture to get into that unused area on the right, but I've had no such luck with the controls on the TV itself.