giftiger_wunsch
New Member
Hi,
Very simple question: what's a definitive way of testing if I've heat-damaged these components through poor desoldering technique?
I removed 3 inductors from a VCR board and tested the resistance between the leads: showed 0.08Ω for two of them (brown marking on side) and 118.3Ω for the third (orange marking on side). I'm guessing that since it's just a coil of wire that this means they're not damaged; is the coloured marking indicative of its inductance?
I (accidentally ) removed a PNP STS733 transistor (**broken link removed**) from the same VCR board, and tested the impedance between collector-base to be ~4.1MΩ and between emitter-base to be ~3.7MΩ. These seem unusually high to me, and when I tried the same test with a store-bought transistor before, I seem to remember the value fluctuated, whereas it's remaining constant with this one. Have I burned out the transistor?
By the way, in case anyone's wondering how I "accidentally" desoldered a transistor, I was soldering two inductors from nearby and I picked the wrong solder joints; desoldered half of each inductor and 2/3 of the transistor . The extra time spent trying to clear the specks of solder I thought were still holding the inductors on probably made it even more likely that I damaged the transistor.
Thanks.
Very simple question: what's a definitive way of testing if I've heat-damaged these components through poor desoldering technique?
I removed 3 inductors from a VCR board and tested the resistance between the leads: showed 0.08Ω for two of them (brown marking on side) and 118.3Ω for the third (orange marking on side). I'm guessing that since it's just a coil of wire that this means they're not damaged; is the coloured marking indicative of its inductance?
I (accidentally ) removed a PNP STS733 transistor (**broken link removed**) from the same VCR board, and tested the impedance between collector-base to be ~4.1MΩ and between emitter-base to be ~3.7MΩ. These seem unusually high to me, and when I tried the same test with a store-bought transistor before, I seem to remember the value fluctuated, whereas it's remaining constant with this one. Have I burned out the transistor?
By the way, in case anyone's wondering how I "accidentally" desoldered a transistor, I was soldering two inductors from nearby and I picked the wrong solder joints; desoldered half of each inductor and 2/3 of the transistor . The extra time spent trying to clear the specks of solder I thought were still holding the inductors on probably made it even more likely that I damaged the transistor.
Thanks.
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