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Author Topic: F27 resistor value  (Read 1151 times)

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Offline montarboTopic starter

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F27 resistor value
« on: March 17, 2019, 08:24:18 pm »
Hello,
Thanks a head for help with SMD resistor value. A code F27 on the resistor itself.
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Offline shakalnokturn

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Re: F27 resistor value
« Reply #1 on: March 18, 2019, 08:10:48 am »
Size, circuit context  and maybe a photo would be helpful.
Any way it could be a fuse?
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Offline montarboTopic starter

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Re: F27 resistor value
« Reply #2 on: March 18, 2019, 11:41:06 am »
1812 package and its in PSU mains input to an industrial LED light, there are two of these in series with a TH (green, black, silver, gold, blue), ie
F27--TH as above--F27. Both the F27 are fried. 
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Offline montarboTopic starter

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Re: F27 resistor value
« Reply #3 on: March 20, 2019, 07:35:45 pm »
Any ideas???
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Offline shakalnokturn

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Re: F27 resistor value
« Reply #4 on: March 21, 2019, 06:28:58 pm »
Check if there is a fuse anywhere else.
Is TH a NTC thermistor? What power is the light?

With no better clues I'd throw in a couple of 27 \$\Omega\$ fusible resistors.
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Offline SiliconWizard

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Re: F27 resistor value
« Reply #5 on: March 21, 2019, 08:28:16 pm »
If this is indeed a resistor, this should be a 12Mohm, +/-5% resistor.

See here for SMD resistor marking:
http://www.marsport.org.uk/smd/res.htm
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Offline shakalnokturn

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Re: F27 resistor value
« Reply #6 on: March 21, 2019, 11:52:21 pm »
12M \$\Omega\$ on the power input that's not going to fit...

Maybe TH is trough-hole, in that case the TH would be an inductor.
An inductor and series resistor is a common setup on the input of cheap SMPSs. I'd still stick to 2x 27 \$\Omega\$ but check power consumption and size of bulk capacitor.
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