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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Scope from hell?
Thanks for sharing... I guess that takes one dso out of the options I've been thinking about... -
Re: Scope from hell?
You get what you pay for... cheap design and cheap software... doesn't surprise me.
Specifications on paper mean nothing!"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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This specification for the HP ProDesk 400 G2 Mini + 2x Pro Slate 8 Paper Folio can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the ProDesk 400 G2 Mini + 2x Pro Slate 8 Paper Folio boardview and ProDesk 400 G2 Mini + 2x Pro Slate 8 Paper Folio schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps...09-12-2024, 03:28 PM
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I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor.
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I'm getting frustrated troubleshooting a paper shredder. The way the shredder normally works is when you turn the power on, nothing happens until you insert a piece of paper. There is an IR shredder in the shredder and inserting the paper breaks the beam and starts the shredder motor. But now the motor runs constantly, even when no paper is inserted. I've replaced the photodiode and the IR emitter. Also the relay makes a nice clicking sound so I assume it is working too. I don't know what else to check. Here's a photo of the circuit board. The red and black wires marked IR - go to the... -
PROBLEM SOLVED
I DIDN'T REALISE MY SMALLEST SOLDERING TIP COULD JUST FIT BETWEEN THESE COMPONENTS.
I MANAGED TO REMOVE THEM WITH NO DAMAGE TO THE BOARD AND I HAVE MY INTENDED END RESULT.
On a Possio PM70 portable fax machine which has a scanner that detects when you push a piece of paper into the scanner slot.
It is these two small (3mm long) components that detect the paper and start the scanner feed motor which pulls the paper into the scanner.
(These are on the circuit board for the keypad and not the main board)
I want to disable these as... -
I have a 40 volt AC transformer that I put a bridge rectifier on, and I wanted to see the input signal and the output signal on the same screen on my scope, so I set one channel up with the test lead on one side of the input and the ground lead on the other side of the input, then I used another channel on the scope and clipped the test lead on the positive side of the output then the ground on the negative side of the output.
When I connected the transformer to power, the wire that was connected between the ground lead on the second channel and the negative side of the bridge rectifier...
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