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Second part in the 3 part series of repairing a viewers BenQ W1070 that seemed to have a bad color wheel. Yet upon deeper investigation, the issue ended up being a bad HDMI chip. The chip was shorted internally. This pulled down the voltage regulator UQ1. After verifying UQ1 was OK, I removed the HDMI chip and the projector began to run correctly (but with no HDMI). The owner OK'd replacing the HDMI chip which will be part 3 of the series. The part number of the problem IC is ADV7612BSWZ.
Part 3 will be here once I record it(once the chip gets here).
If you need a lamp that definitely has a good IR coating: www.purelandsu...
The most important thing to get out of this series is don't get tunnel vision with an issue. The old adage of 'Thou Shalt Measure Voltages' holds as true today as it did when this term was coined.
Shotgunning parts by replacing until it works is expensive and wasteful. I could just replace the main-board, but cost (and partly my ego) say repairing the existing board is the way to go.
Here is the service manual. The site is Hungarian but has an English option. Great website. Donate to them if you use the service often. elektrotanya.c...
Part 1 • BenQ W1070 DLP Project...
Part 3 • BenQ W1070 DLP Project...
As always, thank you for watching!