Re: UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt f
if the LED driver circuit on the PSU functions anything like my cheap LED tester then the open voltage of 280v would indicate open string... if the circuit were closed and current flowed, the voltage would drop based on what amperage the LED circuit wants to draw.
my LED tester will appear 320v when probes have no path to each other. when there is a path (through a single, or multiple LEDs) that voltage drops to whatever the forward voltage drop of the LED's is at whatever amps the thing is designed to provide...im not sure how it tells what the forward voltage drop should be so it doesnt burn out the LEDS...does this just happen automatically due to math of the constant current?
so this makes it look like my LED strips have open circuit according to the PSU
but according to my LED tester they have closed circuit. can the circuit open up that fast under "hot" condition (full power) that an LED wont even have time to flash? this is my gnawing question.
if the LED driver circuit on the PSU functions anything like my cheap LED tester then the open voltage of 280v would indicate open string... if the circuit were closed and current flowed, the voltage would drop based on what amperage the LED circuit wants to draw.
my LED tester will appear 320v when probes have no path to each other. when there is a path (through a single, or multiple LEDs) that voltage drops to whatever the forward voltage drop of the LED's is at whatever amps the thing is designed to provide...im not sure how it tells what the forward voltage drop should be so it doesnt burn out the LEDS...does this just happen automatically due to math of the constant current?
so this makes it look like my LED strips have open circuit according to the PSU
but according to my LED tester they have closed circuit. can the circuit open up that fast under "hot" condition (full power) that an LED wont even have time to flash? this is my gnawing question.
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