Hello; I'm repairing/rebuilding a SMPS section of a TV and I'm a bit confused when I found a power sand-block resistor that says 5W 0.68 ohm
It is .68 ohm. Thats less than 1 ohm. Its just a ballast type resistor to absort power transients.
Perhaps not. It very well may be used as a current sensing resistor. In any even, he should not jumper it out.
Ed
Absolutely do not jumper it out. May still work briefly, then zap. I doubt it would be a current sensor componet considering where it is in circuit. But without any more info as to rest of circuit, who knows.
"James Thompson" wrote in news:a7b11$445d647e$471cd40a$ snipped-for-privacy@ALLTEL.NET:
Being in series with the regulated supply, it might be working with a capacitor as a filter. Similar things are done with 1 ohm resistors in simple constant current laser drivers, between the regulator and a capacitor across the laser diode, to protect against high speed transients. That isn't usually done in the ground line, but it would work the same.
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