To replace the top panel and/or while playing surface, watch the following video chapters:

1) Remove top panel and playing surface
5) Install the playing surface and top panel
6) Test the panel screw tightness

To replace the touch sensor sheet, watch the following video chapters:

1) Remove top panel and playing surface
2) Remove the touch sensor sheet
4) Install the touch sensor sheet
5) Install the playing surface and top panel
6) Test the panel screw tightness
7) Calibrate the touch sensor
Also, please change a hidden setting called Touch Sensor Prescale to 75 (for LinnStrument) or 90 (for LinnStrument 128). To learn how to access this setting, open the Panel Settings page, Global Settings tab, and search for "prescale".

To replace the Main (larger) circuit board, watch all 7 video chapters:

1) Remove top panel and playing surface
2) Remove the touch sensor sheet
3) Replace one of the two circuit boards (to change the Main board)
4) Install the touch sensor sheet
5) Install the playing surface and top panel
6) Test the panel screw tightness
7) Calibrate the touch sensor (for the the new Main circuit board)
Also, please change a hidden setting called Touch Sensor Prescale to 75 (for LinnStrument) or 90 (for LinnStrument 128). To learn how to access this setting, open the Panel Settings page, Global Settings tab, and search for "prescale".

Or to replace the LED (smaller) circuit board, watch all these chapters:

1) Remove top panel and playing surface
3) Replace one of the two circuit boards (to change the LED board)
5) Install the playing surface and top panel
6) Test the panel screw tightness

First click the FAQs link at left/top, then click the "Problems" and read this FAQ:

"My USB jack appears to be physically damaged. For example, if I look closely into the jack, I see some bent pins. Or it has come loose inside the chassis. What can I do?"

If you choose option #1 ("You can have a local electronics repair shop replace the USB jack") and have a LinnStrument 128, or a LinnStrument 200 with serial LNL00700 or higher, watch these video chapters to remove the Main (larger) circuit board, which contains the USB jack:

1) Remove top panel and playing surface
2) Remove the touch sensor sheet (it's safer to remove the delicate sensor sheet before unsolder the USB jack)
3) Replace one of the two circuit boards

With the Main (larger) circuit board removed, follow the instructions in the FAQ to unsolder the damaged USB jack and install the new jack. Then following these video chapters to reassemble your LinnStrument:

3) Replace one of the two circuit boards
4) Install the touch sensor sheet
5) Install the playing surface and top panel
6) Test the panel screw tightness

This usually means that one of the panel screws near the problem column is too loose, perhaps because of insufficient tightening after replacing the top panel. This is because the screws also press the sensor’s contacts against the mating contacts on the circuit board. So if too loose, they may not make contact, so Y-axis won’t work on the nearby column.

To adjust the screw tightness and verify that the problem is solved, watch this video chapter:

6) Test the panel screw tightness

To correctly tighten the screws, here's a good guideline:

Loosen the screw, then slowly tighten it until you START to feel the increased resistance of the screw reaching the end of its travel, at which point the screw head should be level with the panel. Then tighten the screw by 1/4 turn and no more. Over-tightening will cause the silicone rubber to bulge out near the screw, and over-tightening the screws near the Per-Split Settings and Global Settings buttons will cause them to stick in the Pressed state.