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7" TFT monitors, white screen

 
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Oct 19, 2009 3:07 pm    Post subject: 7" TFT monitors, white screen Reply with quote

Now I have to repair a dozen of 7" TFT monitors (like automotive rear seat entertainment or truck rear view monitors), probably a chinese OEM brand, mainly manufactured in 2007-2008. So far, it seems impossible to get any technical documentation for them.

The TFT panel is a Hitachi part, TX18D11VM1CAA, and the driver circuitry is built up around a Pixelworks PW113 image processor and an AD9883A ADC.

The by far most common fault (about 70 %) is that they give a completely white screen, neither internal menus nor an input video signal can be displayed. So far, i have checked that all internal voltages (+5V, +3,3V, +1,8V etc) and checked that the clock oscillators are running at reasonable correct frequencies.

Any clues?
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