6AV2124-0QC02-0AX1 Replacement Guide — SIMATIC HMI Comfort Panel

In Short

The 6AV2124-0QC02-0AX1 is a TP1200 Comfort V2 — 12.1" widescreen color TFT, 1280×800, no function keys SIMATIC HMI Comfort Panel operator terminal, 24 V DC, with PROFINET (2-port switch), MPI/PROFIBUS DP, 2× USB, SD card. Direct replacement is another 6AV2124-0QC02-0AX1; the closest size-compatible alternates are 6AV2124-0UC02-0AX1 (TP1900 V2 step-up) and 6AV2124-0MC01-0AX0 (KTP900). PALM Parts Solution stocks tested units with a 1-year warranty and same-week dispatch worldwide.

Symptoms (when this unit needs replacement)

• Display backlight dark or flickering while the runtime is clearly executing (audible relay clicks, Ethernet LEDs blinking)
• Touchscreen unresponsive in defined zones or drifting calibration that returns after each power cycle
• Boot loop at the firmware splash, or FactoryTalk View ME / WinCC runtime fails to start
• USB / SD storage unmounts at random, corrupting the runtime image
• Lithium RTC battery low warning on every reboot

Causes

• CCFL/LED backlight aging — 50,000 hr typical at full brightness; first symptom is uneven brightness, then full failure
• Touch overlay separation from temperature cycling in enclosures without conditioning
• Compact-flash / SD wear when the application logs heavily to local storage
• Firmware / runtime version mismatch after a Studio 5000 or TIA Portal upgrade — the panel refuses to load the new image
• Power-supply electrolytic capacitor failure on the internal 24 V regulation board

Troubleshooting before you replace

1. Power-cycle while holding the Default / configuration combo (panel-specific) to enter the Maintenance menu.
2. Verify panel firmware version matches the Studio 5000 / TIA Portal project's runtime requirement.
3. Boot from a known-good USB recovery image to rule out a corrupted runtime.
4. Inspect the 24 V DC supply for ripple > 5 % under load — a sagging PSU mimics a dead panel.
5. Reseat ribbon cables to the LCD and touch overlay; check for capacitor venting on the inverter board.
6. If display works but touch fails, recalibrate from the Maintenance menu before condemning the touch panel.

Replacement Options

Related Products (internal links)

• All in-stock 6AV2124-0QC02-0AX1 units → /product/6av2124-0qc02-0ax1
• 6AV2124-0UC02-0AX1 (TP1900 V2 step-up) listings → /product/6av2124-0uc02-0ax1
• 6AV2124-0MC01-0AX0 (KTP900) listings → /product/6av2124-0mc01-0ax0
• Full SIMATIC HMI Comfort Panel catalog on PALM

Related Manufacturer Hub & Category

• Manufacturer hub: Siemens
• Category page: HMIs
• Family page: SIMATIC HMI Comfort Panel

FAQ (FAQPage schema)

Q: Is 6AV2124-0QC02-0AX1 still produced?
A: The SIMATIC HMI Comfort Panel family is in active production; individual catalog codes occasionally shift. PALM stocks 6AV2124-0QC02-0AX1 units (new, refurbished, surplus) to bridge planned and unplanned outages.

Q: What is a direct replacement for 6AV2124-0QC02-0AX1?
A: An identical 6AV2124-0QC02-0AX1 is the only zero-engineering swap — the bezel cut-out, mounting hardware, and runtime image all match. Closest functional alternates: 6AV2124-0UC02-0AX1 (TP1900 V2 step-up) (verify project resolution).

Q: Can I move my existing FactoryTalk View ME / WinCC project to the replacement?
A: Yes, when the panel firmware matches the runtime version the project was built against. Confirm the runtime version in the project file, flash matching firmware to the panel, then transfer via USB or Ethernet.

Q: What is the screen size and resolution of 6AV2124-0QC02-0AX1?
A: 6AV2124-0QC02-0AX1 is a TP1200 Comfort V2 — 12.1" widescreen color TFT, 1280×800, no function keys.

Q: What is the most common failure mode for 6AV2124-0QC02-0AX1?
A: Image transfer aborts on large WinCC RT — usually traced to backlight inverter aging or runtime/firmware mismatch. Bench-test the panel from a known-good 24 V supply before condemning it.

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