Carlos,
As far as I can tell from pulling the phone apart I don't see an EEPROM. There is one chip that could be an EEPROM (has a sticker on it with the MAC address). But from the shape I believe it is a NVRAM type chip (just a guess though). (Probably is a boot ROM though.) Could be an electrical problem but I doubt it since the problem happens across multiple different phones with different power supplies and different outlets on different electrical circuits.
Anyway... inside the 12sp+ there are two circuit boards. One board made by Intecom (model # ITE-12 / part # 73-4144-01). This is the board that handles the keypad and most likely the basic phone display and functionality. That board is connected to a second board produced by Selsius Systems through a 10 pin connector. This board has the network controller on it (Smsc LAN91C94), a DC-DC converter, an Altera Flex 6000 logic gate chip, some flash & ram chips, a DSP chip, an Intel 386EX processor, the chip that has the MAC address on it and a small (basically) square chip with a Cisco label on it.
I'm not an electronics expert or even novice really but if I was to bet on it I would say that the key to making these phones work again is in the chip with the MAC address on it and the small square Cisco chip. BTW... those are the only 2 chips that can be removed without soldering. Also as someone mentioned in a previous post on the mailing list there is a debug port (10 pin connector) and a WDTOUT 2 pin connector. I have NO idea what those connectors are used for or what each pin is used for. Most likely... hook a PC up to the DEBUG port ... send some special commands and COM a replacement image to the chips and off you go. Just need the procedure.
Thanks,
Mike
On Aug 11, 2004, at 12:00 AM, Carlos Hernandez wrote:
With the description you give, the first thing I think of is..
Some of those chips may be EEPROM memories, and they get erased with the light..well infrared light to be more precise, and only if you remove the cover stickers I am just guessing though, I have little information on what actual chipsets you're working with.. or if these phones use EEPROMS at all...
Other thing is you're not using static electricity grounding, and the electronics of the equipment has been damaged, but again, I might be wrong. You might be an expert (or knowledgeable or carefull) in handling the chipsets...
Carlos
Mike Coakley wrote:
I've searched high and lo and googled to I can't google no more... I knew that Cisco bought Selsius to get their VoIP solution but what I didn't know was that the 12sp+ is based upon an ITE-12 product that is apparently used at universities. I've taken two of the phones apart and started swapping parts and have looked up the IC's on the Internet...
Anyway... After using the phones with chan_sccp the phones die for no apparent reason. No LCD. No nothing. About the only thing the phones do is make a static sound when the handset is lifted or speaker is pressed. Can't get the phones to work again. I've tried everything I've found. I've even blew the dust off my CallManager 2.4 CD's and loaded the phone images on my TFTP server. But once the phones go dead there is no more IP traffic from them.
Normally I would assume that the phone is beyond repair but nothing is happening to the phones. They just stop working. Last one that stopped working happened today. Left it on overnight and this morning it was dead.
Anyone have any ideas.
Mike
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