Re: Samsung PN59D550C1FXZA, X-sustain, shorted fets from bad panel?
To answer this specific question... It depends.
The capacitors themselves should show open circuit but you also need to consider what else they are connected to on the board to possibly account for the 723 ohms. (As an example, a capacitor placed directly across a coil to form a parallel resonant circuit will measure virtually 0 ohms resistance like a direct short because the coil is across it, even if the capacitor is perfectly fine.) If you suspect any of the capacitors themselves and you cannot isolate the rest of the circuit, you would need to test them out of circuit by lifting at least one leg of each one to test across.
You need to investigate where the flash came from and really closely trace out what is connected there because something is seriously wrong if there has been a visible flash. Something has failed catastrophically if there is arcing like that. Something is very fried and there will likely be failures in associated components in the circuit, especially "upstream" towards low energy logic control and driver circuits when you're looking at faults in more energetic "power" circuits.
This is the puzzle part that makes repair "fun".
Originally posted by DXseekerMO
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The capacitors themselves should show open circuit but you also need to consider what else they are connected to on the board to possibly account for the 723 ohms. (As an example, a capacitor placed directly across a coil to form a parallel resonant circuit will measure virtually 0 ohms resistance like a direct short because the coil is across it, even if the capacitor is perfectly fine.) If you suspect any of the capacitors themselves and you cannot isolate the rest of the circuit, you would need to test them out of circuit by lifting at least one leg of each one to test across.
You need to investigate where the flash came from and really closely trace out what is connected there because something is seriously wrong if there has been a visible flash. Something has failed catastrophically if there is arcing like that. Something is very fried and there will likely be failures in associated components in the circuit, especially "upstream" towards low energy logic control and driver circuits when you're looking at faults in more energetic "power" circuits.
This is the puzzle part that makes repair "fun".
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