TV, power failure: optocoupler 817 to be replaced?

[izentrop]

Yes, what is your method for testing with the only instrument, a multimeter, without desoldering anything?

In this case, you can only test the infrared led:
Red tip on the anode (marked by a dot), black tip on the cathode in diode position: reading between 900 and 1200 (off circuit)
infinity inverse measure

LTV817.gif (13.24 KiB) Viewed 2323 times

I don't think a power failure comes from that, it's more commonly a power transistor or capacitor failure. Have to see what is said about the forums specialists, giving the make and model of the TV.

[phil59]

As I said before, on 817, infinite resistance, whatever the direction, or the measurement points, 2 out of 5.

The other 3, that doesn't mean they're good, it's also based on what's in front, behind.