To clarify, C501 & C502 are on the Display board, not the Main board. ?Getting to the display board isn't too difficult. ?Just don't lose the little button that sits on top of the Headphone/Speaker switch. ?Also, pay attention to how the slide latch and springs are placed.
The connectors for the ribbon cables have a pressure release tab (light brown if I remember correctly) that you have to gently lift up about 2mm on each end of the connector, to release the ribbon cable. ?It must be raised up still to reinsert the cable later. ?The same applies to the Main board cables.
Take pictures of how the grounding springs are mounted on the main board, so you can reinstall them correctly.
If you haven't soldered surface mount parts before, this is not a good board to learn on! ?Find another ham or electronics repair facility to unsolder the old parts and resolder the new ones. ?All of these circuit boards are very sensitive to static electricity (ESD), so they should only be worked in a static-safe area (ground wrist strap, grounded static safe mat, ground static safe soldering iron, etc.).
These capacitors are readily available 100uf 12VDC tantalum SMD's. ?I don't remember the package size and it's not in the service manual, but if you decide to proceed, I can supply that info, along with a couple of manufacturer's part #'s. ?These parts are polarized, so it is important that the + and - sides are installed the same way as the part you remove. ?There is usually a dot or bar on one end that you must match to the original part.
There are several parts that can cause this problem or fail as a result of the caps shorting, but the repair article you referenced had good advice. ?But you need the service manual also. ?
Steve, W3AHL
Steve W3AHL