I have seen many attempts to illuminate the display of metaldetectors that were lacking.
Not all results were satisfactory, I have an explorer2 and I had an F75, not having the backlit display, even in daylight, it was really unpleasant.
I thought as backlighting my MXT and finally I got the right idea.
First you need to get an old laptop, which will detach from the display (not good external monitors) to its interior is a thick sheet of plexiglass tapered (wedge) going from 3.5 to 0.5 mm, plus a sheet of white plastic and two silver plastic on one side only has the characteristic of being biased, that the light passes from one direction only.
Of these sheets need to do a strip 16.5 mm wide, the plexiglass is cut with a knife and then bending the two sides along the score line is cut, how do I cut the glass.
The thicker side, it should be smooth with fine sand paper and polish to become transparent.
Below the display dell'mxt there are about 2 mm space between the PCB and the display, put on the three strips until they stop, one part is cut flush with the display, on the other, leaving about 3 mm more, except for the white stripe has to come flush with the PCB.
The second component that is found is a white LED with high brightness SMD format, the LED goes unsoldered but cut from the strip along the support.
The third material is a piece of fine wire recovered from the headphones of the Walkman, is unique because it consists of fine enamelled copper wire multiple, then it can be used to weld components such as miniature SMD LED.
Fourth component, a resistance of 470 ohms 1 / 8 watt.
At this point you remove the display dall'MXT unplugging the two connectors, then remove the second pcb card, it puts the white strip below the display leaving it flush with the printed side of VDI, the print is fixed with a strip of biadhesive tape, is thrusts plexiglass protrudes a few millimeters from VDI side, then the other side puts on the silver strip, plexiglass should be among the two strips and the silver must have the silver side of the plexiglass, I recommend the three components should not force the display when inserted!
Soldering the two wires to the LED and paste with little drop of Attak glue (put it on the LED) on the white strip in contact with the rim of Plexiglas (center), masking the top of the LED with a small piece of black ribbon.
Solder the other end of the positive resistance of the LED and solder the resistor to pin 1 of connector wires of the second five-card or pin + electrolytic capacitor C1 near them (see photos!) Solder the negative wire to the second pin connector pins or - the condenser C1.
If you did a good job turning the MXT will see the LED light, and try to close all dark.
Led current are 4.3 mA, for a reduced consumption so I preferred to leave it on.
The plexiglass is a plexiglass particular, as an optical fiber, so do not expect to replace it with a plexiglass normal because it does not work.
Photo 1
Two stripes, white and Silver.
Photo 2
The LED on the strip, cut and assembled with wires
Photo 3
The whole assembly
Photo 4
The wires led welded tab, you see the tube serves to cover the resistance once put it back the card
Photo 5
The two points where you can solder the wires, I prefer to the leads of the capacitor C1.
Foto 6-7
The result, except that the pictures are blurry, I could not do better, because it was half past midnight when do it this!
The backlight is perfectly uniform, a light blue color, almost like a F75
I hope it's an interesting project, I apologize for any translation errors.
Good hunting by night
(tnx Nancy)
Sergio
Not all results were satisfactory, I have an explorer2 and I had an F75, not having the backlit display, even in daylight, it was really unpleasant.
I thought as backlighting my MXT and finally I got the right idea.
First you need to get an old laptop, which will detach from the display (not good external monitors) to its interior is a thick sheet of plexiglass tapered (wedge) going from 3.5 to 0.5 mm, plus a sheet of white plastic and two silver plastic on one side only has the characteristic of being biased, that the light passes from one direction only.
Of these sheets need to do a strip 16.5 mm wide, the plexiglass is cut with a knife and then bending the two sides along the score line is cut, how do I cut the glass.
The thicker side, it should be smooth with fine sand paper and polish to become transparent.
Below the display dell'mxt there are about 2 mm space between the PCB and the display, put on the three strips until they stop, one part is cut flush with the display, on the other, leaving about 3 mm more, except for the white stripe has to come flush with the PCB.
The second component that is found is a white LED with high brightness SMD format, the LED goes unsoldered but cut from the strip along the support.
The third material is a piece of fine wire recovered from the headphones of the Walkman, is unique because it consists of fine enamelled copper wire multiple, then it can be used to weld components such as miniature SMD LED.
Fourth component, a resistance of 470 ohms 1 / 8 watt.
At this point you remove the display dall'MXT unplugging the two connectors, then remove the second pcb card, it puts the white strip below the display leaving it flush with the printed side of VDI, the print is fixed with a strip of biadhesive tape, is thrusts plexiglass protrudes a few millimeters from VDI side, then the other side puts on the silver strip, plexiglass should be among the two strips and the silver must have the silver side of the plexiglass, I recommend the three components should not force the display when inserted!
Soldering the two wires to the LED and paste with little drop of Attak glue (put it on the LED) on the white strip in contact with the rim of Plexiglas (center), masking the top of the LED with a small piece of black ribbon.
Solder the other end of the positive resistance of the LED and solder the resistor to pin 1 of connector wires of the second five-card or pin + electrolytic capacitor C1 near them (see photos!) Solder the negative wire to the second pin connector pins or - the condenser C1.
If you did a good job turning the MXT will see the LED light, and try to close all dark.
Led current are 4.3 mA, for a reduced consumption so I preferred to leave it on.
The plexiglass is a plexiglass particular, as an optical fiber, so do not expect to replace it with a plexiglass normal because it does not work.
Photo 1
Two stripes, white and Silver.
Photo 2
The LED on the strip, cut and assembled with wires
Photo 3
The whole assembly
Photo 4
The wires led welded tab, you see the tube serves to cover the resistance once put it back the card
Photo 5
The two points where you can solder the wires, I prefer to the leads of the capacitor C1.
Foto 6-7
The result, except that the pictures are blurry, I could not do better, because it was half past midnight when do it this!
The backlight is perfectly uniform, a light blue color, almost like a F75
I hope it's an interesting project, I apologize for any translation errors.
Good hunting by night
(tnx Nancy)
Sergio
That's cool. You put a lot into this Sergio. Thanks for the post and HH, Nancy
but it is a very cool mod and I'll save it in case someday I get the courage 
