MD380 screen backlight hack

The screen backlight of the Tytera MD380 utomatically adjusts to ambient light.
It's just 2 resistors and LDR but it's a expert hack.

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  Open the MD380
On the front Board, between two connectors, you have a little group electronic components.
Remove a 2,2k SMD resistor which is located between the two transistors.

This is for example a totally black screen when it is in the complete night.
220k = Slight attenuation of the screen
270k= attenuation of the screen perfect for me
330k= Black screen on the night (see nothing, on the night) 

Solder 270k smd resistor instead of the 2,2k

 Add 2,2k resistor

 And wire. LDR and 2,2k in serial. 

 Make a 4,5mm hole for the LDR near Speaker and mike

 push the LDR on the hole, glue

 This is the front board with 270k // (2,2k + LDR)

2,2k in serial with LDR

Couple 2,2k and LDR in paralelle with 270k.

 

Add black adhesive on back side of the LDR (very important)!

MD380 Tytera picture, on the night, with a bad camera.

I have buy Japanese LDR on ebay: 170591651013
Part number is P1241-05
http://www.alldatasheet.com/datasheet-pdf/pdf/62672/HAMAMATSU/P1241-05.html

Hacks électroniques et radioamateurs par Nicolas F4EGX
Here are all the details of the MD380 screen backlight hack
http://f4egx.blogspot.ca/2016/08/md380-screen-backlight-hack.html

Digital Ham Radio / Amateur Radio
https://groups.io/g/DigitalHamRADIO

Amateur Radio Users Support Group
https://groups.io/g/AmateurRadio 

North America - USA 🇺🇸 / Canada 🇨🇦 Amateur Frequencies
A shared discussion about North America Frequencies.
https://groups.io/g/Frequency


Radio Scanners
https://groups.io/g/Scanners
Whistler Scanners [Whistler, Uniden]