iMac G3 CRT Convergence Ring Holder
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iMac G3 CRT Convergence Ring Holder for Chunghwa and LG CRTs
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- Creative Commons — Attribution — Noncommercial
The original iMac G3 DV CRT convergence ring holder is made of plastic, which is known to become brittle with age. Over time, exposure to heat and mechanical stress can cause the material to crack, crumble, or fail entirely—often during adjustment, but sometimes spontaneously. These replacement parts are designed to substitute the entire original assembly with a more durable solution.
Handling precautions
CRT assemblies contain high voltages—discharge procedures should be followed before servicing.Avoid applying force to aged components; surrounding plastics may also be fragile.
Symptoms of failure
Loose or misaligned convergence rings.
Loss of colour alignment (red/green/blue separation).
Physical fragments from degraded plastic.
Replacement approach
Entire holder assembly must be replaced; partial repair is generally not viable.
Ensure correct orientation and positioning during installation to avoid excessive recalibration effort.
Post-installation adjustment
Convergence must be recalibrated after replacement.
This can be performed in Mac OS 9 using the Screen Adjustment Utility.
Fine adjustments may still require manual tweaking of the rings for optimal results.