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Old 05-15-2020, 05:22 AM   #1
caspian
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Default Component with H Marking

Dear Forum Members,

I have a mainboard LA-6751P belonging to Lenovo G470.
It contains a component called PH902 in the schematics:
component name: PH902
component specs: 10K_0402_5% ERTJ0ER103J
What is this component? what are its properties?
Is there any reference to study?
It looks like a resistor but I do not know what are its differences compared to a resistor.

Thanks
Attached Images
File Type: jpg PH902-.jpg (124.6 KB, 9 views)

Last edited by caspian; 05-15-2020 at 06:14 AM..
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Old 05-15-2020, 05:26 AM   #2
SMDFlea
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Default Re: Component with H Marking

Just do a google search for the part number. Its a thermistor https://industrial.panasonic.com/ww/...ls/ERTJ0ER103J

https://www.ametherm.com/thermistor/...-a-thermistor/

Last edited by SMDFlea; 05-15-2020 at 05:31 AM..
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Old 05-15-2020, 05:26 AM   #3
diif
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Default Re: Component with H Marking

It's a thermistor.
Attached Files
File Type: pdf 2ERTJ0ER103J.pdf (713.5 KB, 4 views)
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Old 05-15-2020, 05:45 AM   #4
caspian
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Default Re: Component with H Marking

thank you
Is it right to solder a 10-KOhm resistor instead of PH902 in the circuit of the picture?
How can I measure specs of a thermistor from a donor board without schematics and boardview?

Last edited by caspian; 05-15-2020 at 06:02 AM..
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Old 05-15-2020, 06:07 AM   #5
kodox
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Default Re: Component with H Marking

i think, that thermistor is there for "heat-security" purposes. as i know, the value will change depend on surrounding temperature
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Old 05-15-2020, 06:19 AM   #6
caspian
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Default Re: Component with H Marking

what does happen to the +VGFX_Core voltage if I do not solder anything on PH902?
what is your recommendation?
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Old 05-15-2020, 06:26 AM   #7
SMDFlea
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Default Re: Component with H Marking

Do a google search you`ll see the same part on quite a few compal boards.Search "10K_0402_5% ERTJ0ER103J" without the quotes "" . What donor boards do you have, search through your schematics for it.
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Old 05-15-2020, 08:47 AM   #8
caspian
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Default Re: Component with H Marking

I have got an idea:
I solder a 10-KOhm resistor in place of PH902. Then, according to the datasheet of Post#3, it means the temperature is always low. Then, the controller thinks the temperature is fine.

is this a good idea for this circuit?
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