EEVblog on Odysee

Repair of a Keithley 2302 battery simulator with junk bin parts. But it did put up a fight!

Teardown video: https://www.youtube.com/watch?v=5LK8wduZsy0

Forum: https://www.eevblog.com/forum/blog/eevblog-1664-repair-with-junk-bin-parts!-keithley-2302/

00:00 - Faulty VFD display in a Keithley 2302 Battery Simulator
01:22 - Teardown
03:14 - The Display driver PCB
04:30 - Solder Sucking Sucks
05:26 - The VFD display module, a Newhaven Display VFM162SDAR8
06:50 - Probing Pro Tip
07:28 - Probing the VFD signals on the oscilloscope
09:42 - Searching for a replacement 16x2 VFD display
15:03 - Potential replacement LCD
16:38 - Identical replacement found
17:44 - Lets check the junk bin...
18:33 - Pinout trap for young players
19:25 - First test FAIL, but hold on a second, lets try something...
21:09 - Winner Winner Chicken Dinner
22:12 - WOAH, now it's not working?
24:09 - Lets try THIS...

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#ElectronicsCreators #Repair #keithley
...
https://www.youtube.com/watch?v=D3c3UVDSKTg

I'd really appreciate if you could fill in the 2025 viewer survey and tell me what you like and don't like about the channel, and what changes I can make. It is ANONYMOUS unless you want to enter the giveaway.
LINK:
https://docs.google.com/forms/d/e/1FAIpQLSdLeQRdLRmbwyLT4yn4d9BZU3kzxjOoFAq-XpqS4g8VL1hXpw/viewform?usp=dialog

I will be giving away three new BM2257 multimeters to random people who fill it out. Thanks.

Forum: https://www.eevblog.com/forum/blog/2025-eevblog-viewer-survey-and-giveaway/

Web Site: http://www.eevblog.com
Hardware Store: https://eevblog.store/
Merch Store: https://www.teepublic.com/stores/eevblog?ref_id=37825

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog
Or with crypto:
BTC: 33BsprBQNBtHuVzVwDmqWkpDjYnCouwASM
ETH: 0x68114e40ff4dcdd384750500501e20acf3875f8c
BCH: 35n9KBPw9T7M3NGzpS3t4nUYEf9HbRmkm4
USDC: 0x68114e40ff4dcdd384750500501e20acf3875f8c
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#ElectronicsCreators #Survey
...
https://www.youtube.com/watch?v=9lXCqePhJ4g

Repairing a customers Brymen BM786 multimeter, and investigating the cause of the InEr error message on the input jack alert feature.
Plus a giveaway to a local youngster.

Keysight OLED meter repair: https://www.youtube.com/watch?v=CKdeqqo2diI

00:00 - A returned BM786 Multimeter with InEr error message
03:23 - Split jacks and input alert circuit
05:19 - In-Circuit probing TIP and Low Ohms mode.
07:19 - A clue?
08:05 - A need a new desoldering gun. Removing the input jacks
10:30 - Bodge testing of the input detection threshold
12:38 - Not one but TWO failed Megger Insulation meters!
13:50 - Megger testing the connectors at 500V
15:19 - Testing a 2nd failed InEr error meter
17:00 - Cleaning the input jacks
19:11 - Heating up the input jacks
20:18 - Getting desperate, removing the input jacks
21:49 - Getting really desparate, removing the input resistors
22:38 - Reassembling the original repaired unit
24:26 - Repaired BM786 GIVEAWAY

Forum: https://www.eevblog.com/forum/blog/eevblog-1663-bm786-multimeter-repair-iner-error-investigation/

Web Site: http://www.eevblog.com
Hardware Store: https://eevblog.store/
Merch Store: https://www.teepublic.com/stores/eevblog?ref_id=37825

Repairing a customers Brymen BM786 multimeter, and investigating the cause of the InEr error message on the input jack alert feature.
Plus a giveaway to a local youngster.

Keysight OLED meter repair: https://www.youtube.com/watch?v=CKdeqqo2diI

00:00 - A returned BM786 Multimeter with InEr error message
03:23 - Split jacks and input alert circuit
05:19 - In-Circuit probing TIP and Low Ohms mode.
07:19 - A clue?
08:05 - A need a new desoldering gun. Removing the input jacks
10:30 - Bodge testing of the input detection threshold
12:38 - Not one but TWO failed Megger Insulation meters!
13:50 - Megger testing the connectors at 500V
15:19 - Testing a 2nd failed InEr error meter
17:00 - Cleaning the input jacks
19:11 - Heating up the input jacks
20:18 - Getting desperate, removing the input jacks
21:49 - Getting really desparate, removing the input resistors
22:38 - Reassembling the original repaired unit
24:26 - Repaired BM786 GIVEAWAY

Forum: https://www.eevblog.com/forum/blog/eevblog-1663-bm786-multimeter-repair-iner-error-investigation/

Web Site: http://www.eevblog.com
Hardware Store: https://eevblog.store/
Merch Store: https://www.teepublic.com/stores/eevblog?ref_id=37825

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog
Or with crypto:
BTC: 33BsprBQNBtHuVzVwDmqWkpDjYnCouwASM
ETH: 0x68114e40ff4dcdd384750500501e20acf3875f8c
BCH: 35n9KBPw9T7M3NGzpS3t4nUYEf9HbRmkm4
USDC: 0x68114e40ff4dcdd384750500501e20acf3875f8c
LTC: MJfK57ujxy55su4XicVGQc9wcEJf6mAoXF

Other channels:
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#ElectronicsCreators #Repair #Brymen
...
https://www.youtube.com/watch?v=ETopbGankfo

This was going to be a repair of a vintage Tandy 200 Portable Computer...

Forum: https://www.eevblog.com/forum/blog/eevblog-1662-vintage-tandy-200-portable-computer-claytons-repairteardown/

00:00 - I sear this Tandy 200 had a problem...
02:54 - Teardown
03:57 - The new BM2257 Multimeter
05:25 - I think it's the buzzer
08:06 - Microscope teardown
16:20 - They don't make service manuals like they used to
25:57 - Try to reproduce the fault

This was going to be a repair of a vintage Tandy 200 Portable Computer...

Forum: https://www.eevblog.com/forum/blog/eevblog-1662-vintage-tandy-200-portable-computer-claytons-repairteardown/

00:00 - I sear this Tandy 200 had a problem...
02:54 - Teardown
03:57 - The new BM2257 Multimeter
05:25 - I think it's the buzzer
08:06 - Microscope teardown
16:20 - They don't make service manuals like they used to
25:57 - Try to reproduce the fault

Web Site: http://www.eevblog.com
Hardware Store: https://eevblog.store/
Merch Store: https://www.teepublic.com/stores/eevblog?ref_id=37825

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog
Or with crypto:
BTC: 33BsprBQNBtHuVzVwDmqWkpDjYnCouwASM
ETH: 0x68114e40ff4dcdd384750500501e20acf3875f8c
BCH: 35n9KBPw9T7M3NGzpS3t4nUYEf9HbRmkm4
USDC: 0x68114e40ff4dcdd384750500501e20acf3875f8c
LTC: MJfK57ujxy55su4XicVGQc9wcEJf6mAoXF

Other channels:
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#ElectronicsCreators #Tandy #VintageComputer
...
https://www.youtube.com/watch?v=pD0dVebSZMs