Samsung SGH-A300 soldering accident

[kevin03]

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]

it's a zener diode 5.6V

[kevin03]

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]

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]

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]

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

[kevin03]

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]

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