There are two white dome shaped plastic caps placed on the top edges of the display unit. At first I thought they were some warning light. But after a little bit of power the current was relatively high so I stopped the test. After finding out the display intensity is automatically regulated according to the amount of light in the environment, it's rather logical that the two caps contain light sensors. I measures the electrical resistance and the resistance changes at changing light conditions. In low light conditions the resistance of the two parallel connected light sensors are 476 ohms. If there's a lot of light, the resistance increases to 511 Ohms. Hopefully I didn't destroy the light sensors with my 'DC voltage test'... I'll validate the correct working as soon as the device is functional again. Some images of the light sensors are shown below.
Here are the two light sensors shown.
After removing the green glass panel, the wiring of the sensors are visible.
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algemeen
