EEVblog 1603 - Sony Amplifier REPAIR - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 29, 2024, 10:08:33 pm
content: 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 problem01:17 - Water isn't that bad actually, even mud.02:49 - Comically long screwdriver time04:09 - Vacuum Fluorescent display for all you VFD fanboys05:10 - Annoying construction06:14 - Logic level problem? Doesn't seem to be the PSU.07:57 - Yuck!09:58 - PCB Cleaning time12:11 - Did the cleaning work?13:28 - Hang on, I think I see something...14:36 - More corrosion15:21 - Back to measuring voltages on the VFD17:15 - Handy use of Auto Hold18:00 - VFD dispaly under the microscope19:33 - Cathode measurement20:13 - Anode connection tracing22:10 - I wouldn't have designed it like this23:08 - Sanity check24:32 - What's in the can?28:16 - Schematic time. Sony service manuals are something else33:22 - Don't come-a-gutsa on dual diode pinouts35:16 - Let's power it up on the bench37:19 - There's something very strange about this...40:04 - Oh FFS!42:03 - Now it'll work...

author: Muxr
author_rank: Super Contributor
timestamp: February 29, 2024, 11:39:50 pm
content: That was a fun one Dave! lol

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 01, 2024, 05:23:50 am
content: Nice Futaba display though.

author: EEVblog
author_rank: Unknown
timestamp: March 01, 2024, 06:26:56 am
content: Quote from: SiliconWizard on March 01, 2024, 05:23:50 amWas interesting how it was basically backwards, so you don't see the grid and cathode wires.

author: elettrocecco
author_rank: Newbie
timestamp: March 01, 2024, 08:34:13 am
content: Nice that you posted the "How VFD displays work" before!ThanksThe 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?

author: EEVblog
author_rank: Unknown
timestamp: March 02, 2024, 02:49:55 am
content: Quote from: elettrocecco on March 01, 2024, 08:34:13 amOff hand I don't know.

author: ksio89
author_rank: Contributor
timestamp: March 04, 2024, 07:32:29 pm
content: Great job Dave! Murphy is indeed a tricky bastard lol. Re-checking your steps is yet another stuff that I learnt by watching your repair videos. And kudos to Sony for making such detailed service manuals, they are amazing.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 04, 2024, 09:09:23 pm
content: It's easy to get misled during a "debugging" session, being hardware or software. And often we tend to focus on things that we think must be the most reasonable culprit, and spend a bit too much time on these.The key is the following:- Be systematic. Test every little thing that is a possible cause of failure, however silly it seems, one by one. As long as it's factually a possible cause.- Don't run in circles.

author: isometrik
author_rank: Regular Contributor
timestamp: March 08, 2024, 03:11:49 am
content: I guess Murphy showing up this time was payback for all those repair videos that turned out to be easy fixes.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: March 09, 2024, 02:18:23 pm
content: FPC cable! It's gotta be the FPC cable! Come on, check the FPC cable! I've never felt so frustrated by waiting for a you, Dave, to figure it out in my life.On the plus side, I guessed correctly.Thanks for the repair vid!

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 11, 2024, 04:07:17 am
content: Quote from: ballsystemlord on March 09, 2024, 02:18:23 pmDid it feel like watching "who wants to be a millionaire" and knowing the answer to the last question?

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: March 12, 2024, 10:44:48 pm
content: Quote from: SiliconWizard on March 11, 2024, 04:07:17 amVery much so!