Electronics > Repair
Rigol DG1022U repair help
lern01:
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!
lern01:
This is U1 on a good power supply board, different silkscreen, but should be the same model IC.
lern01:
The chip with JDVCE printed on it is printed as JDVAK on some DG1022 motherboards. Please help me. Thanks in advance!
lern01:
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.
lern01:
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)
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