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  #11  
Old 08-16-2018, 11:42 AM
John Lansford John Lansford is offline
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John Lansford Congratulations!  Your peers have given you enough reputation to put you into the fist level!

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You have to connect the oscilloscope to an isolation transformer.

Some circuits have floating grounds ( meaning a ground voltage that is not zero and not in any way connected to earth ground. The metal case or the third prong).

I grounded my circuit through the battery chargers ground connection.

Making Earth the ground point, subjected my Verus probe 300 volts above zero.

BOOM!!

Just a dumb mistake.

I picked the Verus because it was floating ( Like any battery powered Digital Multimeter as an example the Fluke 87V.

And then I made it non-floating by plugging in the charger.
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  #12  
Old 08-16-2018, 01:53 PM
kirkbarrow.garage kirkbarrow.garage is offline
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kirkbarrow.garage Congratulations!  Your peers have given you enough reputation to put you into the fist level!

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Quote:
Originally Posted by John Lansford View Post
You have to connect the oscilloscope to an isolation transformer.

Some circuits have floating grounds ( meaning a ground voltage that is not zero and not in any way connected to earth ground. The metal case or the third prong).

I grounded my circuit through the battery chargers ground connection.

Making Earth the ground point, subjected my Verus probe 300 volts above zero.

BOOM!!

Just a dumb mistake.

I picked the Verus because it was floating ( Like any battery powered Digital Multimeter as an example the Fluke 87V.

And then I made it non-floating by plugging in the charger.


I did the exact same thing with two televisions,

Had my main tv Bang & Olufsen on, and had repaired another one and took the aerial out of the B&O and connected to the repaired and then switched on and bang, one blown RCB and B&O tv too.

Not good at any time.
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  #13  
Old 08-17-2018, 10:53 AM
John Lansford John Lansford is offline
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John Lansford Congratulations!  Your peers have given you enough reputation to put you into the fist level!

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The bad parts circled: SOT-23 PIC

2- BAS4004E632 Shottky 40V 0.12 Automotive 3 Pin SOT-3

The bad parts are circled: INPUT Damage PIC

MBRD5H100T4g SHOTTKY DIODE 100v 5a 3-PIN DPAK
DIODE TVS Single UNI-Directional 23.1V 1500Watt 2 PIN SMC
MLC VARISTOR 42VAC/60VDC 250A 75V 2210 SMD


Special Thanks to one of your members ( and youtube poster) for helping me with the SOT-23 Diodes part numbers.
He was kind enough to take a picture of his board.
Attached Images
File Type: jpg Snap-On SOT-23 Diodes.jpg (317.3 KB, 55 views)
File Type: jpg Charger Input PCB.jpg (506.2 KB, 52 views)

Last edited by John Lansford; 08-18-2018 at 05:09 AM.. Reason: added comment
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  #14  
Old 08-17-2018, 12:34 PM
Witsend Witsend is online now
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Witsend Made it to level 2!  Looks like you are on your way to becoming famous

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Wow those 2 circled charred SOT-23s must of had a flame and smoke shooting out. Kinda looks like Charlie Brown wearing welding glasses. I think if the electronic board belonged to any device other than a Snap On Verus, it be set out on the curb
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  #15  
Old 08-17-2018, 12:46 PM
John Lansford John Lansford is offline
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Yes,
It vaporized the pads under those SOT-23 parts and just so you know those parts are only about 3mm across. Yikes, they are small!

I made new pads out of the leg of an 8 pin DIP IC.
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  #16  
Old 08-18-2018, 12:13 PM
John Lansford John Lansford is offline
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Do you think a lot of these are set out to the curb?

Maybe I should offer to purchase a few broken ones?

:-)
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  #17  
Old 08-18-2018, 04:03 PM
Turbo1dr Turbo1dr is offline
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Hey John,

Glad I could help out. It probably saved you at least $1000. Good to know you aren't afraid to take the repair into your own hands instead of going straight to the dealer.
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  #18  
Old 08-18-2018, 04:58 PM
John Lansford John Lansford is offline
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John Lansford Congratulations!  Your peers have given you enough reputation to put you into the fist level!

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Didn't want to call you out by name without asking.

I have nine oscilloscopes, five I repaired. Six Tektronix Curve Tracers.
Bench Digital Multimeters, Signal analyzers, Function Generators.
All sorts of tube testing equipment I have had to repair or bring back from the dead.

I am not afraid !!!

I keep buying broken equipment to learn about and repair and then use those to repair more complicated equipment.

Isn't that what all of us do on this forum?

We are technical problem solvers.

Last edited by John Lansford; 08-18-2018 at 05:03 PM.. Reason: Corrections
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