Just use a dmm lol and for 5v leds a old pc psu with come bodged wires cheap but it works.
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I have tried this unit and a couple of comments about how it works------->
One thing I have seen with unit it works real good if it only has one row another words
Series string
But it dose not work as well if there are in parallel then LEDs do not get very bright you can see if all LEDs are working or not which is good thing
Are there any LED testers that would do parallel LED strings ---->>>> just asking
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
Can you show me the parallel connected LED strings? If they use more than one strings and they are not connected in series to form one big long string each string will have its own MOSFET and current sensor for each string so it this the case to you to locate the Cathode return side of the each string of LED so you can just light up just one string only, it will be very bad design to have the LED strings connected directly in parallel, if one goes open circuit the current on the working string will go up and it is also hard to get the match the total Vf of each string to get each string to have equal current flow.
Can you show me the parallel connected LED strings? If they use more than one strings and they are not connected in series to form one big long string each string will have its own MOSFET and current sensor for each string so it this the case to you to locate the Cathode return side of the each string of LED so you can just light up just one string only, it will be very bad design to have the LED strings connected directly in parallel, if one goes open circuit the current on the working string will go up and it is also hard to get the match the total Vf of each string to get each string to have equal current flow.
Here is the board in question as you can see there only drop down resistor
So is there any kind of tester that would work this kind of board
The way this board is set this see a lot of LED board set up
Attached Files
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
Those LEDS are not connected directly in parallel, each set has its own limiter resistors so this kind of the set the total current draw will be higher than that LED tester can deliver.
You will have to put the Red probe of the tester on the Anode of the second LED of the string you want to test, the black probe on the Cathode of the last LED in that string, then you can test the first LED of that string by itself.
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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