i9505 : Need a capacitor check - GSM-Forum

laptopmd · 03-10-2014, 21:59

Hi friends,

i am searching a short somewhere into a i9505 board.
The phone is working at 99%, everything apart wifi , but it heats very much (cpu and emmc).

It was dropped from the 4th floor of a building, and i have already removed 2 shorted caps, but i suspect a short inside cpu.

I need someone with a good Samsung S4 (i9505) board that can check for me the ohm value to ground of C854 (you can see it's position in the picture attached).

C854 versus ground. Mine board show 8.8ohm , but this is a cpu power line of 1.05 so maybe is correct... but i must compare and i don't have other boards.

Thanks !
Dave

roso · 04-02-2014, 10:33

Hi if you still need it, direct resistance (black to ground and red to capacitor) is 170 Ohm +-5 and inverted resistance is 280 Ohm

laptopmd · 04-02-2014, 10:37

Thank you roso !

Meanwhile, as i never received answer, i have bought a working S4 myself, to repair the other one...

So, my partial faulty board must have some other shorts, even if the phone is working..

(oh, ho visto ora che sei italiano, grazie mille per l'aiuto !)

laptopmd · 04-02-2014, 22:14

Ehy roso !! Good News !!

Thank you to your measurement, now i finally found the shorted cap !!
I have removed this cap and now i have 170ohm on this line !!!

PERFECT, FANTASTIC !! Thank you very very much !!!

HUM · 04-03-2014, 02:12

post here pic how u solved the problem

laptopmd · 04-03-2014, 07:53

@HUM : problem was C854 shorted.

psytr0nic · 12-16-2014, 13:35

I have one , I removed C854 and C838 ( both were shorted ) phone still heating .
can you tell which is the 3dnd Capacitor I removed too ?

04-02-2014, 10:33	#2 (permalink)
roso Freak Poster Join Date: Jul 2005 Location: Italy Age: 42 Posts: 146 Member: 164613 Status: Offline Thanks Meter: 11	Hi if you still need it, direct resistance (black to ground and red to capacitor) is 170 Ohm +-5 and inverted resistance is 280 Ohm

04-02-2014, 10:37	#3 (permalink)
laptopmd Freak Poster Join Date: Jan 2013 Location: Switzerland Age: 48 Posts: 408 Member: 1873863 Status: Offline Thanks Meter: 67	Thank you roso ! Meanwhile, as i never received answer, i have bought a working S4 myself, to repair the other one... So, my partial faulty board must have some other shorts, even if the phone is working.. (oh, ho visto ora che sei italiano, grazie mille per l'aiuto !)

04-02-2014, 22:14	#4 (permalink)
laptopmd Freak Poster Join Date: Jan 2013 Location: Switzerland Age: 48 Posts: 408 Member: 1873863 Status: Offline Thanks Meter: 67	Ehy roso !! Good News !! Thank you to your measurement, now i finally found the shorted cap !! I have removed this cap and now i have 170ohm on this line !!! PERFECT, FANTASTIC !! Thank you very very much !!!

04-03-2014, 02:12	#5 (permalink)
HUM No Life Poster Join Date: Jul 2005 Location: karachi Posts: 8,673 Member: 161728 Status: Offline Sonork: 100.1582708 Thanks Meter: 2,237	post here pic how u solved the problem

04-03-2014, 07:53	#6 (permalink)
laptopmd Freak Poster Join Date: Jan 2013 Location: Switzerland Age: 48 Posts: 408 Member: 1873863 Status: Offline Thanks Meter: 67	@HUM : problem was C854 shorted.

12-16-2014, 13:35	#7 (permalink)
psytr0nic No Life Poster Join Date: Oct 2010 Location: Abidjan Age: 38 Posts: 2,478 Member: 1418143 Status: Offline Thanks Meter: 353	I have one , I removed C854 and C838 ( both were shorted ) phone still heating . can you tell which is the 3dnd Capacitor I removed too ?