Recent Repair Case Studies
Real repairs from our workshop, demonstrating the depth of our diagnostic capability across the full Christie projector range. Every repair backed by our 90-day warranty.
Selected Repairs
Each case study includes the fault, diagnostic process, components replaced, and post-repair verification data.
Christie Griffyn 4K50-RGB
Diode Array Imbalance · London, UK
Fault Description
A major London exhibition venue reported severe colour shift on their primary presentation projector. The Griffyn 4K50-RGB displayed error L03 (RGB array imbalance) with visible magenta cast on white content. Spectroradiometer readings showed the red channel at 73% of nominal output while green and blue remained at 96% and 91% respectively.
Diagnostic Process
Thermal imaging revealed localised hotspotting on the red diode bank heat spreader, indicating TIM (thermal interface material) degradation. Individual diode testing on our precision current source identified three failing diodes in the red array with elevated forward voltage drop — classic end-of-life behaviour. The driver board current sense resistors showed signs of thermal stress.
Repair & Outcome
Replaced three matched red diodes, renewed TIM on all array interfaces, replaced aged current sense resistors, and performed full beam combiner realignment. Post-repair spectroradiometer verification: red 98.2%, green 97.8%, blue 98.1% of nominal. White point ΔE 0.3 from D65 target. Colour gamut 99.7% Rec. 2020.
Christie Roadster HD20K-J
Ballast Ripple Fault · Manchester, UK
Fault Description
A live event rental company reported intermittent lamp strikes and flickering output on a high-hour Roadster HD20K-J. The fault was temperature-dependent — worse after 30 minutes of operation. Error E07 (ballast communication fault) logged repeatedly.
Diagnostic Process
Oscilloscope analysis of the ballast output revealed excessive ripple at 120Hz (twice mains frequency), indicating failing reservoir capacitors. ESR measurements on the 450μF 450V capacitors showed values 8× above specification. Thermal imaging confirmed capacitor case heating to 78°C — well above the 65°C rated limit. The IGBT gate drive resistors had also drifted out of tolerance.
Repair & Outcome
Rebuilt the ballast power stage with new reservoir capacitors, replaced gate drive resistors, and re-tuned the resonant tank frequency. Post-repair: ripple reduced from 18% to 3.2% of DC output. Lamp strike reliability 100% over 48-hour burn-in. Luminance output restored to 96% of factory spec.
Christie Crimson WU31
Phosphor Wheel Sync · Dubai, AE
Fault Description
A Dubai-based corporate AV integrator reported colour breakup and flickering on a Crimson WU31 installed in an atrium with challenging ambient light conditions. The unit displayed E03 (phosphor wheel sync error) within 10 minutes of every cold start.
Diagnostic Process
Inspection revealed phosphor wheel contamination from fine desert dust penetrating the sealed optical path. The Hall effect sensor gap had widened due to bearing wear at 6,150 hours. IR thermal imaging showed uneven phosphor heating during rotation — confirming partial delamination of the phosphor coating in the green sector.
Repair & Outcome
Replaced the phosphor wheel assembly with genuine Christie part, cleaned the entire optical path including integrator rod and relay lenses, replaced the Hall sensor, and adjusted the air filtration system. Post-repair: zero sync errors over 72-hour stress test. Colour uniformity ΔE <1 across the full image area.
2,400+
Projectors repaired since 2010
97%
First-time fix rate
28
Countries served across EMEA
Christie D4K40-RGB
Thermal Shutdown · Dublin, IE
Fault Description
A Dublin cinema multiplex reported repeated thermal shutdowns on their flagship D4K40-RGB during peak summer operation. The unit would run for 45-60 minutes before displaying W02 and shutting down. Other identical units in the same projection booth operated normally, ruling out ambient temperature as the sole cause.
Diagnostic Process
Thermal imaging during operation showed the TEC cold plate for the green diode array running 12°C above the other two channels. Borescope inspection of the liquid cooling loop revealed significant algae and mineral deposit buildup in the micro-channel cold plate, restricting coolant flow to approximately 40% of design capacity. The coolant pump was also running 15% below rated RPM due to bearing wear.
Repair & Outcome
Flushed the entire liquid cooling system, replaced the micro-channel cold plate, installed new coolant pump, and refilled with manufacturer-specified coolant. Post-repair: all three channels within 2°C of each other at full output. 72-hour continuous burn-in passed without thermal events. Restored to full 40,000-lumen output.
Christie DWU2022-HS
Power Rail Undervoltage · Edinburgh, UK
Fault Description
A Scottish university's main lecture theatre projector began displaying intermittent horizontal banding before eventually refusing to start, showing E05 (power rail undervoltage). The unit had been showing occasional W06 (firmware mismatch) warnings for several weeks prior.
Diagnostic Process
Power supply board analysis identified the 12V rail sagging to 10.8V under load. The main switching regulator MOSFET showed gate threshold voltage drift consistent with thermal aging. Three aluminium electrolytic capacitors on the output stage had dried out (ESR 3× spec). The banding was traced to the DMD logic supply instability corrupting the bit-plane timing.
Repair & Outcome
Replaced the regulator MOSFET, all output stage capacitors with low-ESR replacements, and reflashed the firmware to the latest compatible version. Post-repair: all rails within ±2% of nominal under full load. No banding after 24-hour pattern test. Luminance output 98% of factory spec.
Christie M 4K25 RGB
Optical Degradation · Berlin, DE
Fault Description
A Berlin-based simulation facility reported progressive loss of contrast and visible colour non-uniformity across their M 4K25 RGB unit used in a multi-projector dome. The issue developed gradually over 6 months, with contrast ratio dropping from 2000:1 to approximately 800:1.
Diagnostic Process
Full optical path teardown revealed significant dust accumulation on the DMD heat sink fins causing thermal degradation of the micromirror surface coating. The integrator rod had micro-fractures from thermal cycling. All three colour filters showed UV-induced yellowing after 9,600 hours of high-brightness operation.
Repair & Outcome
Complete optical path rebuild: replaced DMD with new unit (matched die revision), installed new integrator rod, replaced all three colour filters, deep-cleaned the prism assembly, and realigned the optical engine. Post-repair: contrast ratio restored to 1850:1. Colour uniformity ΔE <0.5 across full image. Successfully re-blended into the existing dome array without visible seams.
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