EEVblog 1603 - Sony Amplifier REPAIR

Repair of a Sony HCD-SBT20B Bluetooth Stereo. What it’s like to nail the repair and then, well come-a-gutsa and have to go down the rabbit hole to fix the fix all whilst battling bad design info. How VFD displays work: Forum: 00:00 - Sony HCD-SBT20B Bluetooth Stereo with a water ingress problem 01:17 - Water isn’t that bad actually, even mud. 02:49 - Comically long screwdriver time 04:09 - Vacuum Fluorescent display for all you VFD fanboys 05:10 - Annoying construction 06:14 - Logic level problem? Doesn’t seem to be the PSU. 07:57 - Yuck! 09:58 - PCB Cleaning time 12:11 - Did the cleaning work? 13:28 - Hang on, I think I see something... 14:36 - More corrosion 15:21 - Back to measuring voltages on the VFD 17:15 - Handy use of Auto Hold 18:00 - VFD dispaly under the microscope 19:33 - Cathode measurement 20:13 - Anode connection tracing 22:10 - I wouldn’t have designed it like this 23:08 - Sanity check 24:32 - What’s in the can? 28:16 - Schematic time. Sony service manuals are something else 33:22 - Don’t come-a-gutsa on dual diode pinouts 35:16 - Let’s power it up on the bench 37:19 - There’s something very strange about this... 40:04 - Oh FFS! 42:03 - Now it’ll work... If you find my videos useful you may consider supporting the EEVblog on Patreon: Or with crypto: BTC: 33BsprBQNBtHuVzVwDmqWkpDjYnCouwASM ETH: 0x68114e40ff4dcdd384750500501e20acf3875f8c BCH: 35n9KBPw9T7M3NGzpS3t4nUYEf9HbRmkm4 USDC: 0x68114e40ff4dcdd384750500501e20acf3875f8c LTC: MJfK57ujxy55su4XicVGQc9wcEJf6mAoXF Web Site: Store: Other channels: EEVblog2: EEVdiscover: T-Shirts: #ElectronicsCreators #Repair #Sony