Replacing the Touch Screen
or Touch Controller.
On most terminals the touch layer sits above the LCD, so both are reached through the same opening. What differs is what actually has to be replaced — the glass layer, the controller board, or both — and that depends entirely on why the touch failed.
Which Part Do You Actually Need to Replace?
The touch controller can be replaced on its own. This is the distinction that saves the most money, because the glass and the controller fail for different reasons and only one of them is usually at fault.
| Symptom | Replace | Action |
|---|---|---|
| Cracked touch glass, LCD still fine | Touch glass only | This guide |
| Touch works only in some areas | Touch layer | Localised damage to the conductive layer |
| Touch dead everywhere, glass intact | Controller first | Swap the controller; replace glass only if it is still dead |
| Touch offset, drifting, or registering the wrong spot | Neither | Not a hardware fault — see the touch calibration guide |
| Touch dies after a firmware or driver update | Neither | Driver issue — roll back or recover the OS |
| Works with a stylus but not a finger, or the reverse | Check the panel spec | Touch technology mismatch |
| Ghost touches, random inputs with nothing touching the screen | Controller or noise | Controller swap, or investigate electrical noise |
The distinction that matters
Cracked glass means replace the glass. Glass intact but unresponsive means replace the controller first.
Many touch failures are attributed to the panel and resolved by replacing the whole touch assembly, when the controller board alone would have been sufficient. On our terminals the controller is a separate board, which is precisely so that it can be changed on its own.
Touch Panel Specifications
These specifications apply across our POS terminals, kiosks and all-in-ones. One of them materially changes how much work a replacement involves.
| Specification | Detail |
|---|---|
| Touch technology | PCAP capacitive across the entire range — POS terminals, kiosks and all-in-ones alike |
| Controller form | A separate small circuit board, replaceable independently of the touch panel |
| Calibration after replacement | Not required. The driver is built into the operating system and recalibrates automatically on boot |
| Kiosk touch points | 10-point multi-touch |
| Gloved operation | Not supported by standard capacitive panels — relevant where staff work in gloves |
No calibration step, and that is deliberate
Because every panel in the range is driven by the operating system's built-in driver, fitting a replacement touch panel or controller does not require a calibration procedure. The unit recalibrates itself on the next boot.
Manual calibration exists, and we cover it in the touch calibration guide, but it is a remedy for a specific symptom — touch registering in the wrong place — rather than a step that follows a replacement. If touch works in the correct positions after a swap, there is nothing further to do.
Is Your Display Fully Bonded?
On a bonded display the touch layer is laminated to the LCD with no air gap. That layer cannot be separated, so the assembly has to be replaced as a whole. Across our range you can settle this from the model number alone, without opening anything.
| Model | Display construction | Touch layer separately? |
|---|---|---|
| SN-A10, A15, B10, B20, B30, C10, C20, C30, F10, F20, W50 | Non-bonded — an air gap separates the glass from the LCD | Yes — replace separately |
| SN-P10, P20, P30, P60, P90 series | Bonded — the touch layer is laminated to the LCD | No — replace the whole assembly |
| Self-service kiosks (all models) | Integrated display assembly | Generally no — replace the assembly |
The P-series models listed above also carry an IP54 rating for the display assembly. If your unit is a custom or unlisted model, use the field check below.
Field check for models not listed
Probe the edge with a plastic tool
With the terminal powered down and the rear cover removed, insert a plastic pry tool gently at the corner between the touch glass and the panel beneath it. Never use metal.
Read the resistance
- ✓ A single layer of glass lifts away smoothly — the display is not bonded, and the touch layer can be replaced on its own.
- ! There is firm resistance and the glass and LCD feel like one piece — the display is likely bonded. Stop here.
If unsure, stop and ask
Photograph the display edge and send the model number to your supplier for confirmation. A bonded assembly forced apart is destroyed, and it is not recoverable.
Ordering the right part
The model number is all you need to supply. Panels are not interchangeable between models even where the sizes appear similar, so quoting a model number gets the correct panel, whereas quoting a screen size does not.
On a bonded model — the P-series and kiosks — the part you order is the complete display assembly with the touch layer already laminated. There is no separate touch layer to order on its own.
Disassembly
Everything up to the touch layer is identical to replacing the LCD panel: same opening, same seal, same connector discipline. The steps below begin at the point where the two procedures diverge.
Before the divergence point
Power down and disconnect. Work grounded. Remove the rear housing screws and lift the housing. Handle the old waterproof seal and disconnect the panel cable. Those steps are covered in full in the LCD replacement guide, and the procedure is the same here.
Step 1 — Establish the stacking order
The usual structure, from the outside in, is: housing, touch glass, LCD, backlight, mainboard. Establish where your model diverges from that before removing anything.
On a bonded display the touch layer is laminated to the LCD and cannot be separated, so the whole assembly is replaced and the procedure is a supplier job. On a non-bonded display there is an air gap between the touch glass and the LCD, and each can be replaced separately.
Step 2 — Separate the touch glass
-
1
Disconnect the touch ribbon cable. It is finer than the LCD ribbon and the connector is smaller, so take it slowly and never pull on the cable itself.
-
2
Lift the touch glass away from the edge, working slowly around the perimeter rather than from a single point.
-
3
Handle the replacement panel by its edges only. The conductive layer is on the underside and marks are not always visible.
Step 3 — Replace the touch controller
-
1
Locate the touch controller — a separate small board, usually fixed to the edge of the panel frame.
-
2
Disconnect its two interfaces: one to the touch glass, one to the mainboard.
-
3
Fit the replacement controller and reconnect both interfaces in the original positions.
Only where the glass is intact and the touch remains dead after a controller swap is the glass itself the fault.
Reassembly and Touch Verification
Reassembly follows the LCD procedure: a fresh waterproof seal and screws tightened in a diagonal pattern. Verification is where the two procedures differ, because a touch panel can be fitted correctly and still fail at the edges.
Reassembly
Fit a new waterproof seal — the old one cannot be reused once the housing is opened — and tighten the housing screws diagonally and progressively rather than fully torquing each screw in turn.
Touch verification
Work through every item below before the terminal goes back into service. The corners are where fitting problems show up first.
Power on and reach the operating system. No calibration step is required — the built-in driver recalibrates on boot.
Run a nine-point tap test: four corners, the midpoint of each edge, and the center.
Draw a diagonal line and confirm the trace is continuous with no breaks.
Test multi-touch with a pinch gesture — our panels support up to 10 points.
Run for ten minutes and confirm there are no ghost touches.
If staff operate the unit in gloves, test accordingly — standard capacitive panels may not respond.
If the touch is offset or drifting
Offset touch that is otherwise responsive is not a fitting fault. On Windows, open Control Panel → Tablet PC Settings → Display → Calibrate, or search for “calibrate the screen for pen or touch input”. This is a remedy for that symptom rather than a routine step after a replacement.
Boundaries
Touch panels are the most static-sensitive assembly in the terminal, which is what sets the boundary here. If the housing has to come open, finish with resealing the POS after service, or browse the full troubleshooting index.
✓ You can do this
- · Replace the touch glass on a non-bonded display
- · Replace the touch controller
- · Reseat the touch ribbon cable
- · Run manual calibration where touch is offset
! Supplier
- · Whole-assembly replacement on a bonded display
- · Mainboard touch interface faults
- · Touch IC soldering
Safety boundaries
- · Touch panels are the most static-sensitive part in the terminal. Always ground yourself and handle by the edges only.
- · Never bend a touch panel to test it. The conductive layer cracks invisibly and fails days later.
- · Confirm whether your model uses a bonded display before ordering parts. On bonded units the touch layer cannot be separated.
- · Disconnect power before removing the rear housing, and let the panel cool if the unit has been running.
Related Troubleshooting Guides
The LCD and the touch layer share one opening, and the same seal protects both.
Replacing a Cracked or Damaged POS Screen
The LCD procedure, including the shared steps above the touch layer.
Touch Screen Unresponsive or Inaccurate
Diagnosing touch faults before deciding which part to replace.
Resealing a POS Terminal After Screen Service
The seal specification and the correct reassembly sequence.