Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - MadBoy1979

Pages: [1]
1
Electronic Video Blog / Re: DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM
« on: January 08, 2016, 03:17:25 PM »
After disassembly of the unit is running which it was installed in the box for him - took chips from defective board and mount it on the workers.

http://i.ebayimg.com/images/g/lTMAAOSwjVVVw2hm/s-l1600.jpg for 8$

The problem is not bad jsoldering  -  in chip itself.
There were files on the network for this type of tester according to the chip and display. I will reprogram a chip and will have backup tester :)

2
Electronic Video Blog / Re: DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM
« on: January 07, 2016, 02:32:22 PM »
These days when I have more free time - I will replace defective chips from bad pcb to the working circuit board. If all is well - a significant problem in the board.It will remove all items, cleaning and re-soldering.

3
Electronic Video Blog / Re: DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM
« on: January 07, 2016, 01:23:07 AM »


Yesterday morning my package arrives commissioned by the first link - the approach was from ebay.
In the evening I put together - procedure was the same. Not even bothered to clean flux. After inserting and calibrating - I started to use it. I do not have the same problems as before.
The previous assembly kit that makes the problem - Install the new display - but displayed the same - obviously the problem is around the chip. But now I do not have time to do it now.

When measuring the resistance of 680 ohms - between 1 and 2, 1 and 3, 2 and 3 - reading is the same.

4
Electronic Video Blog / Re: DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM
« on: November 27, 2015, 06:11:45 AM »
just after the turn saw another high angle captions display - very difficult to see.
The program is in chips - apparently display problem.

n turn - the unit and placed no element which measure should be displayed:
No, unknown, or damaged part ?

but i see this :
No, unknown, or ty!aged empty!p ?

sometimes device without element to measure itself turn off after a few seconds, but sometimes characters disappear and the display is lit backlight with led over encoder

maybe the problem is a ribbon cable to the display board

Here are the latest to which came as a conclusion.
No problem in the display or the board.
The problem is that the program is recorded on the chip.
The contrast setting is 0 to 63.
At the moment I do 35 and see great.
After a known time contrast changes alone 0 and barely visible - go into setting change it with only one rotation of the encoder and immediately normalized.

just saw it
need Vcc = 5 v    -  but i have 4.94 v

after the change of voltage stabilizer  HT7550-1 - I'll see the difference

5
Electronic Video Blog / Re: DIY M12864 Graphics Version Transistor Tester Kit LCR ESR PWM
« on: November 26, 2015, 05:31:57 PM »
hello
once I assembled this tester calibration and rejoiced in the beginning. But after a few minutes use - display unit stopped showing any signs but the backlight works and does not want to exclude - if you pull the battery connector with a metal screwdriver - shorted battery short after left back to work machine - made the same problem.
Display no longer displays anything, but after I visited my friend programmer - we wanted to see whether an entry in chips - but only saw FFFF
you have the opportunity to send my file to program the chip

Pages: [1]