This is unreal. My posts earlier in this thread bemoaned the blotchy problem. Infocus service in the UK wanted to charge 100s of pounds to fix the problem - what a bunch of crooks
Turns out all you needed to enter the servuce menu and play with the color wheel index value and the blotchyness goes away.
[Can someone explain what is going on here?]
On every color wheel system (FP and RPTV), there is mark of some sort on or in the wheel. This is the color wheel index (CWI) mark. Elsewhere, there is a sensor that "sees" this mark once per revolution and passes a signal to the light engine. There is software in the light engine that keeps the wheel spinning at some multiplication factor of the displayed video by tweeking the color wheel motor controller. The idea is to keep the CWI mark signal at a specific time relationship to the vertical sync signal. Many of these CWI marks are applied to the color wheel by hand during color wheel manufacturing. As such, two specific CWI marks on two specific wheels may not be in the same location with respect to the color segments of the wheels.
The CWI adjustment allows the people in the factory to do fine adjustments to set the timing of the color segments of the wheel with the timing of the display video. That is, it allows them to adjust for someone putting the CWI mark in a slightly different location.
For others - the service code sequence is
5. Down arrowButton
6. Up Arrow button
Last edited by bigtartn; 12-02-2015 at 06:12 PM.