DCDC Delta 292A0xxxxR P0852F1 repair operation manual #20250304165894

• Factory defect design
• Design flaw
• Shorted/Bad 12V Battery

• P0852F1,
• P085249,
• P085296,

• 292A01843R,

• 292A09205R,

VVDI Prog / Xprog
400V Lab supply ( This one )
Online firmware file editor
Weller soldering station
453EQ DCDCBOX ( EV Clinic product )

 1- First, troubleshoot and confirm that you have encountered errors from the list retrieved via the diagnostic OBD tool. These errors can lead to a permanent lock of the Battery Management System (BMS) if DCDC was on fire or shorted and then BMS will need repair to. This repair covers those DCDC errors and in some cases DCDC is not repairable. However, once unlocked operation manual is not refundable. In 50% cases it is mostly software defect and repair is easy, but in other cases there is HW and SW defect and repair is complex and deep troubleshooting on the bench is needed

 First step is to place DCDC inverter into DCDCBOX device to confirm you got same problem on the bench with 12V battery connected to simulated output

 Now connect 300V-400V powersupply with more than 1 Amp available power to the backside of DCDCBox. (It will work even on lower voltage 240V)
Consumption is 0.24A

 In this video is fully displayed how to perform test on repaired and on defect DCDC unit using our DCDCBox device. 300V power supply must be connected to the back of the device, and front is 13.7V input to the Aux battery

 Remove 12 screws marked on picture

 Remove those screws to release upper cover and PCB

 This is HV power board with MOSFET components and your zone of interest

 Example when it is...