Electronics > Repair
Rigol DG1022U repair help
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lern01:
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.
lern01:
It seems my DG1022 is dead and cannot be repaired.
lern01:
It’s unexpected that I can’t search for the specific model of these two small chips. How sad!!!
Swake:
I have a simple brain and try to structure all this information so I understand what is going on as there are several symptoms here.


--- Quote from: lern01 on December 08, 2024, 11:17:52 am ---schematic diagram of the power board
--- End quote ---
Nice job, I'm certain this will help someone sooner or later.
Herewith some findings:
The chip on the left in the primary section is also marked as U1, you might want to rename it. If you know what it is please add to the schematic.
You might want to rename Transistors T2 and T3 into Q1 and 2
You might want to rename U7 to T1.
not very important as of now: Any information about the coils (L3; L8 ->12)? Size, number of windings, markings, anything)

Your Issues:
Issue A/
U1; known as 00E0 and as 004W; 6 pins
After removal the power supply works again. So I suspect it somehow pulls on the +5V in your schematic.
I think it does influence the power supply via pin3 and U2. Or LED and T of U2 are reversed in the schematic and it receives a 'power good' info.
What are the connectors J3 and J8 connected to?

Issue B/
Screen not bright. Screen boost IC damaged. known JDVEC and as JDVAK; 8 pins
It might be AAT3190 from another post about the Rigol DM3051: https://www.eevblog.com/forum/repair/rigol-dm3051-burned-ic-please-hd74lv2g08aushelp-to-identify/
See attached datasheet.

--- Quote ---I drew the circuit diagram of the boost part
--- End quote ---
Yes, it makes sense to me, I mean the AAT3190 in this part of the schematic.

Else these 2 companies on Alibaba reference JDVEC, you might want to contact them:
-  https://www.alibaba.com/product-detail/JE-17-JDVEC-JDM15-JD50K-JD3GB_1601227654975.html
-  https://www.alibaba.com/product-detail/Consult-and-negotiate-supply-Chip-and_1601263155383.html

Issue C/
Square waveform has ripples on CH1 output.
Let's first focus on the above 2 issues.



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