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Electronics => Repair => Topic started by: lern01 on November 25, 2024, 11:42:10 am

Title: Rigol DG1022U repair help
Post by: lern01 on November 25, 2024, 11:42:10 am
Rigol DG1022U does not turn on. After checking, it was found that the power board U1 was damaged, with silk screen 00E0 (or 004W). Since it does not affect the circuit operation, after dismantling, the power output is normal, but the screen is not bright. The mainboard works normally. Using an oscilloscope to detect, CH1 and CH2 both have waveform output, but the square wave waveform of CH1 has ripples. Inspection found that the screen boost IC (silk screen JDVEC) is damaged. It only affects the LED+ and LED- voltages that do not meet the requirements, but if the display circuit is normal, the screen should also display. Suffering from the lack of a circuit diagram, there is no progress at present. Please give me some advice, and if you know the parameters of the two ICs, please let me know. Thank you very much!
Title: Re: Rigol DG1022U repair help
Post by: lern01 on November 25, 2024, 11:46:08 am
This is U1 on a good power supply board, different silkscreen, but should be the same model IC.
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 02, 2024, 06:43:44 am
The chip with JDVCE printed on it is printed as JDVAK on some DG1022 motherboards. Please help me. Thanks in advance!
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 02, 2024, 10:28:05 am
I drew the circuit diagram of the boost part, and I hope experts can analyze the chip model.
U1 is a digital potentiometer that controls the voltage boost of U2, that is, adjusts the brightness of the display.
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 02, 2024, 12:05:55 pm
I just borrowed a good 1022 from a friend. The waveforms output from pins 5 and 7 of U2 are as follows:（The U2 silkscreen here is JDVAK）
Title: Re: Rigol DG1022U repair help
Post by: adam7 on December 02, 2024, 07:33:17 pm
Check this on PIC10F200T-I/OT:
https://item.szlcsc.com/8716.html?fromZone=s_s__%2522PIC10F200T-I%2522
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 04, 2024, 02:49:45 pm
Quote from: adam7 on December 02, 2024, 07:33:17 pm
Check this on PIC10F200T-I/OT:
https://item.szlcsc.com/8716.html?fromZone=s_s__%2522PIC10F200T-I%2522


This is a tiny microcontroller.
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 08, 2024, 11:17:52 am
I have hand-drawn the schematic diagram of the power board and uploaded it for reference by those who need it. If there are any errors, please inform me in time. Once again, I would like to ask friends who know the models of these two chips to help me. Thank you very much!
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 10, 2024, 07:29:27 am
I’m happy that someone downloaded it and hope to get a reply.
Title: Re: Rigol DG1022U repair help
Post by: adam7 on December 10, 2024, 10:10:56 pm
Check this one:
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 13, 2024, 10:07:41 am
Thank you very much^-^
But the functions and pin arrangements are different. The boost IC on the DG1022 has two PWM outputs, which are boosted by capacitors and diodes.
Title: Re: Rigol DG1022U repair help
Post by: lern01 on December 28, 2024, 01:34:28 pm
It seems my DG1022 is dead and cannot be repaired.