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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 08-23-2001, 07:36   #1 (permalink)
sat
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Post I have seen hundreds of Nok3210 with the same problems! let's discuss it!


everyday I get several Nokia 3210 with the same problem. While talking some of speech is heard like chewed, speech ends and comes occasionally. The same is when I use handsree. It's definitely not a h.speaker problem. Problem is too common and widespread to leave it without attention <img src="smile.gif" border="0">
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Old 08-23-2001, 16:28   #2 (permalink)
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Yes...

This is Bcos of not proper Filtering of Rx Frequency.

Check the Filter.

U will b Happy Guy...

Best of Luck...

<img src="smile.gif" border="0"> <img src="smile.gif" border="0"> <img src="smile.gif" border="0">
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Old 08-23-2001, 17:19   #3 (permalink)
sat
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thanks for reply. where is it? which filter? can you indicate exact location, name? Have you got such an experience, and have you ever tried this solution? does it help? could it be becouse of another hardware fault?
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Old 08-23-2001, 18:57   #4 (permalink)
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HI <br />The filter look like chocolate chip(black colour).Or reflow the cobba ic.<br />Enjoys. :-)

<img src="biggrin.gif" border="0"> <img src="biggrin.gif" border="0"> <img src="biggrin.gif" border="0">
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Old 08-23-2001, 22:13   #5 (permalink)
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Hi<br />If fillter is fault you can by pass it by sold direct two wire from pin 2 to pin 8 and pin 4 to pin 6. If it's not OK you must replace COBBA IC and re flash proggram.<br />rgds
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Old 08-24-2001, 09:13   #6 (permalink)
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Hi Quang..<br />I think you right, nut re flashing nokia and then it not correctly network and no signal.<br />Can you mail me detail and we will discuus more about this problem!<br />regards!<br /> [email protected] <br /> <img src="cool.gif" border="0"> <img src="cool.gif" border="0"> <img src="cool.gif" border="0">
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Old 08-24-2001, 09:18   #7 (permalink)
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[ 24 August 2001: Message edited by: FREINSHIP ]</p>
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Old 08-24-2001, 11:13   #8 (permalink)
sat
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there are many filters on component side of 3210.Please indicate exactly, which one should be replaced. is it Epcos B4693 SAW RF filter; Fc = 1842.5MHz, Bandwidth 90MHz, OR Ceramic filter 13MHz +/- 0.09MHz, OR EPCOS; SAW filter 71MHz +/- 90kHz, OR, SAW filter; 232MHz +/- 0.5MHz, OR Murata; SAW filter 947.5MHZ +/-12.5MHz, used in Rx path after the LNA output, OR Epcos SAW filter B4677 range 890-915MHz (fc = 902.50), used in Tx path before the Power amplifier input, OR, Epcos B4109; SAW filter 1747.5MHZ +/- 37.5MHz, OR Epcos B4409; SAW filter 1747.5MHZ +/- 37.5MHz.
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Old 08-24-2001, 15:38   #9 (permalink)
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Hi guys...3210 has a "sickness" with audio breaking up...i've done many by simply reflowing the COBBA only ...try it!!! <img src="wink.gif" border="0"> <img src="wink.gif" border="0"> <img src="wink.gif" border="0"> I only attempt filter IF reception bars r fluctuating & then causes audio prob. <img src="wink.gif" border="0"> <img src="wink.gif" border="0">
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Old 08-24-2001, 16:19   #10 (permalink)
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Hello Sat...

Sorry for make u in trouble.

The filter is Located Below Right most Side if u r putting yr Board as that it's antenna contacts Stays UP side... Seems Like a Black Chocolate Chip or normal Crystal.

But before doing this follow the Cells R Us and OTher Guys... Reflow the COBBA IC. (Don't try to change it... otherwise u'll b in trouble <img src="smile.gif" border="0"> ).

B carefull and Best of Luck

<img src="smile.gif" border="0"> <img src="smile.gif" border="0"> <img src="smile.gif" border="0">
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Old 08-24-2001, 19:59   #11 (permalink)
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Hi,

That's the trouble, if you have faulty Cobba or accidently damage it by reflow you can't do anything about this phone.

The value from inside ROM is used for the phone security routines and changing the chip will<br />require recalculating the default IMEI values - something could be done only in Nokia R&D department <img src="frown.gif" border="0"> .

Some people say that Dejan can do this, but this is not confirmed yet by someone we can trust and the prices for log's are really high, not iconomical for repair !

The good old way is to change Cobba from different phone ( bad water fault or inside crack), but you have to transfer eeprom content from the dead phone to the repaired together with<br />Cobba. After that need to reset Full Factory in <br />WinTesla.

If these two phones are different SW or PPM, need to update by Dejan 1.04.

I don't know for 3210 - too much hassle. In our service center such phones go to the rubish bin <img src="smile.gif" border="0">

Best Regards
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Old 08-25-2001, 01:09   #12 (permalink)
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How about fluctuating signal guy? What components could be faulty?
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Old 08-25-2001, 07:06   #13 (permalink)
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I have reflowed COBBA from the opposite side of board. I was afraid to damage it by wrong reflow. Then I tested the phone, - nothing changed. I let it stay for a while, and then tried again, and it worked! Voice heard very clearly! Thanks all for help!!! By the way, how to reflow COBBA right? How much time should it stay under hot air gun?
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Old 08-30-2001, 04:52   #14 (permalink)
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My friend, I guess that is a question of practice and experience. Let you gut feel dictate to you if enough reflow is enough. <img src="wink.gif" border="0">
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Old 08-30-2001, 08:09   #15 (permalink)
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I usually reflow about 10 sec, and it depends on model of phone. Some phones doesn't switch on after reflow (like T28 - there were several cases).
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