BK Precision 879B Err E02 Repair (BK Precision 879B Data Sheet)
While performing in-circuit ESR testing, I took a break for a cup of coffee. Upon returning to the project, I encountered an issue. As soon as I hooked it up, there was a sudden discharge, and I realized I had inadvertently taken out my LCR meter, the infamous BK Precision 879B displaying an Err E02. A quick Google search, including guidance from the EEVBlog and BK Precision’s page, suggested checking Fuse 200. Fortunately, Fuse 200 was intact. The EEV Blog post further directed me to inspect the -5V rail, and sure enough, it was shorted. This LCR meter is made for BK Precision by Tonghui share similar hardware and Specs as the Tonghui TH2822A
Err E02 this is what happens when you connect a cap that was not discharged.
Firmware Version (When Off HOLD USB then Push Power Button)
Display model (When Off Push and Hold Power Button)
BK Precision 879B Opened Up.
BK precision 879B Compared to the Tonghui TH2822A (Thanks radioFlash eevblog)
Now the Quick Repair..
The Voltage Inverter U603 a TPS60400DBVT was the problem.
I ordered some then I got distracted with other jobs not requiring the LCR Meter and I misplaced them so had to order more this time I got right to it so i would not misplace the small pack again. so now it was time Remove the TPS60400DBVT
Clean Up The Flux, and tin the small SOT23-5 pads of U603
Installed New TPS60400DBVT in U603 Chewcked the -5V TPO and checked good no short.
Install a fresh 9v and Power it on for a Function Check all Done. LCR Meter is Back to Working Order! Total time for fix about 10min waiting for parts 2 weeks.
Next weeks control boards that will be in will be a fast fix now the LCR is up and running will prob cut 3-4 days off my Repair Queue.
Update Jan 24th 2026 X-Ray Images of the Circuit Board.
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Here is the Full X-ray Image of the BK Precision 879B at 1X
Some Zoomed In 1.45X Shot had to do it in 3 i have not learned how to resize/scale and stitch the images together yet no time to dedicate to it.
Last Updated on January 24, 2026 by Steven Rhine