Samsung SGH-A300 soldering accident - GSM-Forum

kevin03 · 11-04-2002, 09:47

Hi All,

I soldered out the eeprom from the phone and I removed by mistake a "little part" near the eeprom too. The "little part" fell down and I can't find it. Now the phone is restoring the factory settings after each turn-on.
I looked for this "little part" in the service manual and I found its name and value, but I don't know what kind of electronic device is.
Its name is: V619 (at the top-left position from the eeprom)
The value according with the part list: 5.6V 20A 1X0,5X0,6mm TP
Can anyboby tell me what type of electronic device is it?
Whit what can I replace it? (short-cut, etc...)
If not this "little part" is the cause for this behaviour, what is it?
Thank you in advance for your reply.
____Kevin____

brka1 · 11-04-2002, 10:39

it's a zener diode 5.6V

kevin03 · 11-04-2002, 12:04

Thanks for reply, but if it is a zenner diode than why are "ZD" marked parts in the part list (e.g. ZD400 UPS5817, 20V, 1A SMD, TP)? It is a "V" marked part (V619). What is it meaning? If it is a zenner, what is its polarity?
What is its function?
Thanks for answers.
____Kevin____

kevin03 · 11-04-2002, 17:10

I looked after it and I found that it is a VARISTOR!
Please tell me how is it working. Why needed it here?

Thx

____Kevin____

kevin03 · 11-04-2002, 17:56

I think my problem is not this "little part", because the Imei is 0000000000000/0. I think my eeprom is partialy out of order. Can be just a software problem, but I don't know how to solve it.

____Kevin____

doctorvatson · 11-05-2002, 06:44

imei 00000.... can be from bad soldering of eeprom or bad hex in eeprom. seem to be your eeprom without power

kevin03 · 11-06-2002, 00:07

All of the soldering are good. I didn't change the hex in the eeprom, I read it only. Can I repair the phone (with a new eeprom) if the eeprom died? I have the hex, but I don't sure it's not wrong...
____Kevin____

doctorvatson · 11-06-2002, 06:37

try to connect eeprom's pin 8 with "+" of batt contact with wire inside phone.

11-04-2002, 09:47	#1 (permalink)
kevin03 Freak Poster Join Date: Oct 2001 Location: Hungary Posts: 175 Member: 7005 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	Samsung SGH-A300 soldering accident Hi All, I soldered out the eeprom from the phone and I removed by mistake a "little part" near the eeprom too. The "little part" fell down and I can't find it. Now the phone is restoring the factory settings after each turn-on. I looked for this "little part" in the service manual and I found its name and value, but I don't know what kind of electronic device is. Its name is: V619 (at the top-left position from the eeprom) The value according with the part list: 5.6V 20A 1X0,5X0,6mm TP Can anyboby tell me what type of electronic device is it? Whit what can I replace it? (short-cut, etc...) If not this "little part" is the cause for this behaviour, what is it? Thank you in advance for your reply. ____Kevin____

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11-04-2002, 10:39	#2 (permalink)
brka1 No Life Poster Join Date: Apr 2001 Location: Bogatic , RS Age: 46 Posts: 641 Member: 4395 Status: Offline Thanks: 51 Thanked 158 Times in 63 Posts	it's a zener diode 5.6V

11-04-2002, 12:04	#3 (permalink)
kevin03 Freak Poster Join Date: Oct 2001 Location: Hungary Posts: 175 Member: 7005 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for reply, but if it is a zenner diode than why are "ZD" marked parts in the part list (e.g. ZD400 UPS5817, 20V, 1A SMD, TP)? It is a "V" marked part (V619). What is it meaning? If it is a zenner, what is its polarity? What is its function? Thanks for answers. ____Kevin____

11-04-2002, 17:10	#4 (permalink)
kevin03 Freak Poster Join Date: Oct 2001 Location: Hungary Posts: 175 Member: 7005 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	I looked after it and I found that it is a VARISTOR! Please tell me how is it working. Why needed it here? Thx ____Kevin____

11-04-2002, 17:56	#5 (permalink)
kevin03 Freak Poster Join Date: Oct 2001 Location: Hungary Posts: 175 Member: 7005 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	I think my problem is not this "little part", because the Imei is 0000000000000/0. I think my eeprom is partialy out of order. Can be just a software problem, but I don't know how to solve it. ____Kevin____

11-05-2002, 06:44	#6 (permalink)
doctorvatson No Life Poster Join Date: Aug 2001 Location: Russia Moscow Age: 35 Posts: 568 Member: 5889 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	imei 00000.... can be from bad soldering of eeprom or bad hex in eeprom. seem to be your eeprom without power

11-06-2002, 00:07	#7 (permalink)
kevin03 Freak Poster Join Date: Oct 2001 Location: Hungary Posts: 175 Member: 7005 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	All of the soldering are good. I didn't change the hex in the eeprom, I read it only. Can I repair the phone (with a new eeprom) if the eeprom died? I have the hex, but I don't sure it's not wrong... ____Kevin____

11-06-2002, 06:37	#8 (permalink)
doctorvatson No Life Poster Join Date: Aug 2001 Location: Russia Moscow Age: 35 Posts: 568 Member: 5889 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	try to connect eeprom's pin 8 with "+" of batt contact with wire inside phone.