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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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09-26-2011, 11:56 | #1 (permalink) |
Insane Poster Join Date: Jan 2011 Location: Romania Age: 34
Posts: 69
Member: 1499154 Status: Offline Thanks Meter: 0 | N97 dead I have a problem with a n97 that wont turn on after i changed the micro-USB conector... i removed the sim tray with the hot air gun and resoldert the broken micro-USB afther that i had a short on VBAT so i traced the problem to N4402 witch was overheating (i mesured a 0.89A curent from the battery) i removed the chip (N4402) and now the phone dosent have the short anymore but when i press power on the current jumps to 0.011A and stays that way for ever... Anyone can help me? |
09-26-2011, 13:06 | #2 (permalink) | |
No Life Poster Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 38
Posts: 3,473
Member: 1017374 Status: Offline Thanks Meter: 2,594 | Quote:
If yes then reball N4402 & solder back. If no replace it with an working one. | |
09-26-2011, 17:00 | #6 (permalink) |
No Life Poster Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 38
Posts: 3,473
Member: 1017374 Status: Offline Thanks Meter: 2,594 | Ok phone must work without this led driver,i found part number LP5521 CSP-20 of it you can Google a little. See on board maybe some component is missing it may fall when you heated. Or problem might be that when shorted Led Driver to Vbat it burn Power Management ic. |
09-26-2011, 19:04 | #7 (permalink) |
Insane Poster Join Date: Jan 2011 Location: Romania Age: 34
Posts: 69
Member: 1499154 Status: Offline Thanks Meter: 0 | well the ideea is that the RAP comunicates with the LED driver through i2c interface... after the RAP sends the comand it waits for a ACK (acknowledge) from the LED driver... i am not sure that is the case here, anyway i will try to mesure some tensions on the board... Tanks for the help! multumesc |
09-26-2011, 19:09 | #8 (permalink) | |
No Life Poster Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 38
Posts: 3,473
Member: 1017374 Status: Offline Thanks Meter: 2,594 | Quote:
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03-10-2012, 22:06 | #9 (permalink) |
Junior Member Join Date: Apr 2009
Posts: 5
Member: 1008395 Status: Offline Thanks Meter: 0 | Initially I had a Nokia n97 The phone fell into the water with shock. Later Bad worked Touch I opened my phone and the phone became switched off and not power. Please help me. Please So necessary |
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