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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Nokia > Nokia Hardware & Hardware Repair

Nokia Hardware & Hardware Repair all what you need for Hardware Repairing for Nokia Phones. Before writing any thread here try to check the Frequently Asked Questions Section.

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Old 03-30-2011, 22:24   #1 (permalink)
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Thumbs up basic way nokia short circuit find out


basic way nokia short circuit find out

you have to collect same model schematic..(if available)


sometime parts conected with bat +ve (due to many reason) get short ...then multimeter show(reading) short. some parts are directly conected with bat +ve terminal and some parts are conected via some small coils(+ve supply/).also some coils(+ve supply series coil) are conected throuh +ve supply coils. here i am show you the coils conected with bat +ve terminal..

here is my sample with 6303i rm-638...

OPEN SCHEMATIC......



click at zoom....





click next again...




now the coils are marked...(red circle)



here is the fbr vbat conected part....
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now find the part(s) which directly conected with vbat +ve

here is my sample with 6303i rm-638...

some pert(s) are directly conected with vbat +ve....

see the image...the green and blue marked part(s) are directly conect with vbat +ve terminal....





remove or open L2080...if short remain in battery +ve terminal check all capacitors(change if short)in green mark. if capacitors are ok then finally need to change one after N5702 or N5701 mark in blue.


now the part(s) are marked....

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Old 03-30-2011, 22:25   #2 (permalink)
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now find the short part(s) or section....

if you have doubt with any particular section!!!

here is my sample with 6303i rm-638...

see the image..



1.open or remove L1400(+ve supply coil)... if short remain in battery terminal it mean this section is clear(no short in the section).
so we have to go another part or section.
2.open or remove L1400(+ve supply coil)...if found short between L1452(+ve supply series coil) to grownd 1st you have to check
the green mark capacitors(replace if short).if capacitors are ok then finally need to change N1450.

now the part(s) are marked...



by this trick i check short circuit in PCB
----------------------------------------------------------------------------------

NOW FIND THE PART IN PCB

here is my sample with 6303i rm-638...

i am going to find location of coil L2130 in pcb..

SEE THE IMAGE..



the block C4 is the cross section of the graph(for L2130)



here is the my fbr find the part...
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Old 05-24-2014, 11:44   #3 (permalink)
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Please help my nokia n900 short in battery connector. And now the vbat- point in the pcb not work and vbat+ is work in vbat- or vbat+ .where is the short?Please HELP!!
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Old 05-26-2014, 11:38   #4 (permalink)
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cheack and remove


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Old 05-26-2014, 21:07   #5 (permalink)
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thanx nice post

Thank u for sharing,but i like to ask is these the same method to check short on other brands,like samsung ,lg,sony or is the method for nokia only thanx
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