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EEVblog 1603 - Sony Amplifier REPAIR

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EEVblog:
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.

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...

Muxr:
That was a fun one Dave! lol  :palm:

SiliconWizard:
Nice Futaba display though.

EEVblog:

--- Quote from: SiliconWizard on March 01, 2024, 05:23:50 am ---Nice Futaba display though.

--- End quote ---

Was interesting how it was basically backwards, so you don't see the grid and cathode wires.

elettrocecco:
Nice that you posted the "How VFD displays work" before!
Thanks

The inductor (L1 min 25:40) seems sealed with silicon to avoid buzzing. I have never seen any as nice as that.
Does any one know who could produce them?

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