Electronic Engineer Discuss

Title: Led driver Hantek DSO5202P [Print this page]

Author: anton0456 Time: 2017-7-29 20:47
Title: Led driver Hantek DSO5202P
Edited by anton0456 at 2017-7-31 02:12

Hello! Couple years ago bought this scope. Now screen is blinks and half screen not lighting. Half leds in screen not working. And led driver on max brightness not working correctly. Led driver chip is uknown. Google doesn't know about this chip. I can buy leds, but i can't buy led driver. Can anybody say, what chip is using there? Or where i can buy new display?

Author: amy Time: 2017-7-31 09:26
Sir, please give us a video to study.

Author: anton0456 Time: 2017-7-31 13:11
Edited by anton0456 at 2017-7-31 13:27

video
one more video

Author: amy Time: 2017-7-31 14:28
Sir, this should be the LCD screen is broken.
Please disassemblethe scope, and check the model on a label on the LCD.
And purchase a new one on ebay to replace.
If you are not sure of the model, please upload a picture of the LCD.

Author: anton0456 Time: 2017-7-31 14:31
Edited by anton0456 at 2017-7-31 14:40

I can't find this screen anywhere.
https://cloud.mail.ru/public/xQxK/k845QXqGs - screen photo

Author: amy Time: 2017-8-1 10:03
Sir, the model of the LCD is AT070TN92.
Please purchase on ebay, such as: http://www.ebay.com/itm/7inch-TF ... b6864c5:g

Author: anton0456 Time: 2017-8-1 11:59
OK, but where is "LCD Adapter"? Led driver is broken too.

Author: amy Time: 2017-8-2 08:35
Sir, please tell how you make sure that the LED driver is broken.

Author: anton0456 Time: 2017-8-2 12:47
Edited by anton0456 at 2017-8-2 13:11

Instead of LEDs, I connected a resistance of 70 Ohms and measured the voltage - continues to jump, as with LEDs

Author: amy Time: 2017-8-3 11:02
Sorry, I can't understand.
Which one LED?

Author: anton0456 Time: 2017-8-3 12:24
Edited by anton0456 at 2017-8-3 15:12

The display has 15 LEDs. Five lines of 3 serial connected LEDs. Each LED consumes 30mA. Total result is 150mA. The maximum voltage that leddriver gives is -10.8V. To get a current of 150mA, we need to apply Ohm's law, which says: R = U / I. We substitute our values into the formula and get R = 10.8 / 0.15 = 72 Ohm. Disconnect the LEDs from the board and replace them with a 72 Ohm resistor. Measure the voltage across the resistor. Up to 9V, the voltage behaves normally, after 9V it starts to jump. Conclusion. It broke not only the light in the display, but the LedDriver installed on the "LCD Adapter" board. It's easy.

I just need to know what is LEDDRiver chip installed on "LCD ADAPTER" board. Or where I can buy this board. That's all.

Author: amy Time: 2017-8-10 09:45
Sir, please press "Utility->System information" and give us the sw version to study.

Author: amy Time: 2017-8-10 11:30
Edited by amy at 2017-8-10 11:32

Sir, please use the two firmwares to update.
[attach]1661[/attach]

Can one of them improve the screen flash problems?
Please tell me the result.

Author: anton0456 Time: 2017-8-10 12:08
Edited by anton0456 at 2017-8-10 12:35

Firmware doesn't slove the problem.

Author: amy Time: 2017-8-11 10:00
Sir, please send a message to me caiyijun@hantek.com

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