Forum: Troubleshooting TVs and Video Sources
Today, 11:31 PM
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Replies: 2
Views: 51
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Forum: General Electronics Technical Discussion
Yesterday, 10:18 PM
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Replies: 9
Views: 158
Re: LED Resistor Calculations ...
I would run those LED's at 80% of rated current (spec of the LED based on 25c temperature).
You could have made the traces larger to help dissipate the heat from LED, you have lots of room for big...
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Forum: General Electronics Technical Discussion
04-17-2021, 12:45 PM
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Replies: 35
Views: 383
Re: Kind of a different question...
Use your AC Volt meter to measure the Voltage between AC outlet ground and the metal part of the Macbook.
Plug the Macbook power supply into the GFCI outlet then use your AC Amp meter between outlet...
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Forum: Troubleshooting TVs and Video Sources
04-15-2021, 09:25 PM
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Replies: 6
Views: 197
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Forum: Troubleshooting TVs and Video Sources
04-15-2021, 09:17 PM
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Replies: 15
Views: 231
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Forum: General Electronics Technical Discussion
04-14-2021, 11:09 PM
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Replies: 35
Views: 383
Re: Kind of a different question...
Bottom line, you need to ground the exposed metal of the computer to the AC safety ground, and to add safety, plug the AC adapter into GFCI outlet.
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Forum: Troubleshooting TVs and Video Sources
04-09-2021, 09:11 PM
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Replies: 8
Views: 539
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Forum: Troubleshooting TVs and Video Sources
04-09-2021, 09:02 PM
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Replies: 5
Views: 183
Re: Sony KDL 46HX900
How did you check each LED backlights strings? There are many LED strings on that panel based on many LED connectors on the driver board.
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Forum: General Electronics Technical Discussion
03-24-2021, 08:19 PM
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Replies: 118
Views: 1,669
Re: Meters and Microamps
The type of display has nothing to do with the precision, its the circuit and the precision of the components.
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Forum: General Electronics Technical Discussion
03-23-2021, 12:46 AM
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Replies: 118
Views: 1,669
Re: Meters and Microamps
Can we see more details spec about the spec of this meter? Make and brand?
As shown, it can read down to 000.1uA on 400uA scale with one decimal point resolution.
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Forum: Troubleshooting TVs and Video Sources
03-21-2021, 01:41 AM
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Replies: 7
Views: 262
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Forum: Troubleshooting TVs and Video Sources
03-19-2021, 04:37 PM
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Replies: 3
Views: 233
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Forum: Troubleshooting TVs and Video Sources
03-17-2021, 10:50 PM
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Replies: 14
Views: 370
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Forum: Troubleshooting TVs and Video Sources
03-13-2021, 04:29 PM
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Replies: 10
Views: 367
Re: LG 43UK6090 no image
Please attach the pictures of the whole backside of the TV showing all the boards and the screen shot of the panel when TV is turned on so we can see what we are dealing with.
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Forum: Troubleshooting TVs and Video Sources
03-13-2021, 04:25 PM
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Replies: 15
Views: 537
Re: No backlight but LEDs are fine
1) TV OFF, All the boards and connectors are back in place.
2) Keep DCV (set t0 200VDC scale) meter Black probe on the chassis.
3) Red probe on the 'ANODE' pin of the LED connector (LED connector...
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Forum: Troubleshooting TVs and Video Sources
03-02-2021, 12:21 AM
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Replies: 27
Views: 1,329
Re: No power on Vizio D32F-E1 TV
That test will only be applied to the power supply board that has pull-up resistors for the power supply control signal lines for self test purpose, your power supply board does not have pull-up...
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Forum: General Electronics Technical Discussion
03-01-2021, 12:29 AM
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Replies: 13
Views: 1,921
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Forum: Troubleshooting TVs and Video Sources
02-28-2021, 01:30 AM
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Replies: 10
Views: 465
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Forum: Troubleshooting TVs and Video Sources
02-28-2021, 01:24 AM
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Replies: 27
Views: 1,329
Re: No power on Vizio D32F-E1 TV
Please attach good clear pictures of the whole backside of the TV showing all the boards, and good clear straight shot of the whole power supply board so we can see what we are dealing with.
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Forum: General Electronics Technical Discussion
02-27-2021, 12:02 AM
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Replies: 13
Views: 1,921
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Forum: Troubleshooting Computer Displays
02-25-2021, 10:54 PM
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Replies: 31
Views: 2,866
Re: Need help hooking up LED back light strips.
Did you get any paper works that come with the LED driver board and the LED strip?
That LED driver board (constant current power supply) has the boost converter circuit that boost the 12VDC input to...
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Forum: General Electronics Technical Discussion
02-23-2021, 05:01 PM
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Replies: 7
Views: 456
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Forum: Troubleshooting TVs and Video Sources
02-21-2021, 02:45 PM
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Replies: 35
Views: 1,010
Re: sony kdl 40x 3500 no backlights
The 6.8 Ohm across the relay contact is for limiting inrush current when power is applies to the circuit, the relay is closed to bypass the resistor when TV is turned on.
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