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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 01-30-2003, 13:16   #1 (permalink)
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VBB and VCORE path Shorted to ground


In a 3310 phone,There is a short circut on VBB and vcore,both of them are connected to ground!
Should i check all capacitors between ground and VBB,VCORE lines????
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Old 01-30-2003, 13:39   #2 (permalink)
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Check PA and Charging IC.. some time cuase short.

Best Regards,
Wahab
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Old 01-30-2003, 15:19   #3 (permalink)
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so CPU hot?.if CPU hot from experience i thing CPU damage

Last edited by SE-THAILAND; 01-30-2003 at 15:25.
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Old 01-30-2003, 17:09   #4 (permalink)
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No CCONT HOT
there is 750 mA current follow.
No VCOBBA.I changed Cobba, Vcoba is ok now but ccont hot yet.
and 700mA current .
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Old 01-30-2003, 21:23   #5 (permalink)
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First: Bad soldered CCONT (short on power output lines).
Secod: CCONT itself.
Third: Many components are connected to CCONT's output voltages.May be one of those or two or more components can be
faulty.
Forth: Board.

Regards
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Old 01-30-2003, 23:20   #6 (permalink)
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Quote:
Originally posted by GSMLight
No CCONT HOT
there is 750 mA current follow.
No VCOBBA.I changed Cobba, Vcoba is ok now but ccont hot yet.
and 700mA current .
ok try this.remove ccont and clean PCB.set powersupply to 2.8v then connect to VBB if not consume your lucky.if still consume try remove N100,N400,D301,D302,N200 by step.if still not work this is last choice .........CPU............

see u on chat room or icq 177537555

goodluck

Last edited by SE-THAILAND; 01-30-2003 at 23:29.
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Old 02-01-2003, 07:04   #7 (permalink)
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thanks
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Old 02-06-2003, 09:38   #8 (permalink)
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With out any BGA on board there is still short VBB to ground!!
I think one of capacitors borned.
I discarded board and changed it with new one.
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Old 02-06-2003, 10:38   #9 (permalink)
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mad is faulty
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Old 02-08-2003, 11:55   #10 (permalink)
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It is OK.Mad was the problem
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Old 02-09-2003, 09:14   #11 (permalink)
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i can solve this success but stupid in vision of engineer
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Old 02-09-2003, 18:05   #12 (permalink)
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When VBB and Vcore are shorted to GND - for sure MAD2 is problem i have from 2 days 3 pcs with same fault - only one i was repair - all others - CPU lines are damaged when try to take out processor - uff - 33xx CPU is so hard to replace...

If someone have some easiest way to **** glue under MAD2 - let me know...
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Old 02-10-2003, 10:45   #13 (permalink)
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let me know too
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