0914: TOUGH REPAIR (PART 2) TDK LAMBDA 48V 10A POWER SUPPLY
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🎬Episode 1: • 0904: GUASTI A CATENA SU ALIMENTATORE TDK ...
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I'm resuming the repair of the TDK Lambda 48V 10A power supply, started in the first episode. ( • 0904: GUASTI A CATENA SU ALIMENTATORE TDK ... ) where I had detected problems with the PFC board. I started with this board, verifying that the many replaced components are still allowing it to work properly. Even though the board has been repaired, the power supply still won't start. I run some tests without the PFC board to determine the problem. I narrow the analysis to the main switching circuit and then to the secondary switching circuit. I check the signals present on the PWM controller during startup; it's known that after a correct initial phase, the voltage drops. I narrow the search to a secondary switching circuit and perform a thorough visual inspection of the circuit board. I notice something suspicious, but at this point I'll let you watch the video to see how it turns out. Enjoy!
⏰ Index:
0:00 Prologue and Theme
1:11 Introduction
2:41 Episode 1 Recap
3:52 Rectifier Bridge Replacement
4:10 PFC Board Bypass Test
8:20 Discharge Tool in Action
8:40 Hard-to-See Fault
10:00 SMD PTH Matching for the PWM Controller
11:20 Testing the New PWM Controller
12:00 Electrolytic Waveform
13:35 Control Board Disassembly and Inspection
16:00 Controller Startup Curve
16:40 Secondary Switching Analysis
18:50 PCB Visual Analysis
21:00 The Moment of Truth
23:10 In-Depth Analysis
23:30 Testing with an Electronic Load
29:00 PFC Signal Analysis
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