6210 after change cobba - GSM-Forum

tgsm · 02-11-2004, 21:45

Hi
Have problem : after change cobba, power on

nly led and black screen for a moment and beeping sound from speaker.
Without cobba shows "contact service" like normal !
Change 3 cobbas still the same,change hagar,ccont....still the same
NOT water damage!
please any help

Medz · 02-12-2004, 15:18

Really strange but it could be not IC problem it may be a shorted Capacitor pushing the cobba to get crazy oscillating !!
Also the capacitors of the smoothening of the voltages if not working gives instability and strays wich may leads to oscillation too.

tanmay · 02-12-2004, 18:46

@ tgsm
I thinks first of all to change C450 ,C451,C452 COMPONENTS. And If the problem is not solve THEN TRY TO REMOVE VOLUME BUTTONS and CHECK THE SHORTING ON VOL. BuTTONS, if there is any shorting then remove .........DEAR BEST OF LUCK

//Tanmay//

YamahaR1 · 02-12-2004, 19:04

1. Look for components missing around cobba where you worked.
2. Some of the green paint covering the pcb under the cobba is gone and
now the balls isn't a ball when you put it on again. (The solder runs
onto the tracks)
3. If this is the case no way to repair most of the time.

tgsm · 02-12-2004, 20:38

solved by myself It was bad program in the flash .Change and rework program All is OK
Very strange

02-11-2004, 21:45	#1 (permalink)
tgsm Freak Poster Join Date: Jul 2002 Location: Europe Age: 47 Posts: 351 Member: 13827 Status: Offline Thanks Meter: 16	6210 after change cobba Hi Have problem : after change cobba, power onnly led and black screen for a moment and beeping sound from speaker. Without cobba shows "contact service" like normal ! Change 3 cobbas still the same,change hagar,ccont....still the same NOT water damage! please any help

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02-12-2004, 15:18	#2 (permalink)
Medz No Life Poster Join Date: Sep 2003 Age: 66 Posts: 807 Member: 39601 Status: Offline Thanks Meter: 13	Really strange but it could be not IC problem it may be a shorted Capacitor pushing the cobba to get crazy oscillating !! Also the capacitors of the smoothening of the voltages if not working gives instability and strays wich may leads to oscillation too.

02-12-2004, 18:46	#3 (permalink)
tanmay Freak Poster Join Date: Nov 2003 Age: 45 Posts: 158 Member: 43545 Status: Offline Thanks Meter: 7	@ tgsm I thinks first of all to change C450 ,C451,C452 COMPONENTS. And If the problem is not solve THEN TRY TO REMOVE VOLUME BUTTONS and CHECK THE SHORTING ON VOL. BuTTONS, if there is any shorting then remove .........DEAR BEST OF LUCK //Tanmay//

02-12-2004, 19:04	#4 (permalink)
YamahaR1 Freak Poster Join Date: Feb 2002 Location: I am outside your house, I am armed Age: 56 Posts: 482 Member: 9698 Status: Offline Thanks Meter: 0	1. Look for components missing around cobba where you worked. 2. Some of the green paint covering the pcb under the cobba is gone and now the balls isn't a ball when you put it on again. (The solder runs onto the tracks) 3. If this is the case no way to repair most of the time.

02-12-2004, 20:38	#5 (permalink)
tgsm Freak Poster Join Date: Jul 2002 Location: Europe Age: 47 Posts: 351 Member: 13827 Status: Offline Thanks Meter: 16	solved by myself It was bad program in the flash .Change and rework program All is OK Very strange