I2C monitor - GSM-Forum

microera · 09-15-2004, 08:39

Anybody know where is good forum (like this) for question about TV servis, I2C bus, electronic, .......

--------------------------- Here is question if anybody know:
My friend working on a TV which was struck by lightning. The damaged parts were power supply and processor SDA555 B002.

The power supply is now fixed and the processor replaced, but I still can
not get the picture via tuner.
The picture via SCART is OK, however without sound.
When I measure the voltage on I2C bus, the signals are continuously
changing. The voltage does not settle on 5V.

With disabling SDA, SLC and other individual ICs I achive nothing.

My guess is that the processor does not get the return info from an IC,
(which is constantly addressing it), presumably the tuner.

A few times I have noticed schematics (in Elektor) which enables technician
to monitor the state on the IC2 bus with the help of an PC.
Now I wonder if someone can help me get a Software with which I would be
able to analize what is going on on the I2C bus. I wish to find out, (on the address which is addressed by processor), which component does not answers processor's request. I think this would help me locate the problem.
Help would be greatly appreciated.
---------------------------

mister_e · 09-17-2004, 19:21

hi microera,
i got this problems a few times. in my cases some eeprom adresses was corrupted. try to find a tv with the same chassis board and copy eeprom to a new one. Try to find eeprom # begin by 93C or 24C. I don't know if will help but that was my results for my specific cases.

let me know.

many regards

Mister_e

09-15-2004, 08:39	#1 (permalink)
microera No Life Poster Join Date: Jun 2001 Location: www.microera.si Posts: 1,535 Member: 4923 Status: Offline Thanks Meter: 74	I2C monitor Anybody know where is good forum (like this) for question about TV servis, I2C bus, electronic, ....... --------------------------- Here is question if anybody know: My friend working on a TV which was struck by lightning. The damaged parts were power supply and processor SDA555 B002. The power supply is now fixed and the processor replaced, but I still can not get the picture via tuner. The picture via SCART is OK, however without sound. When I measure the voltage on I2C bus, the signals are continuously changing. The voltage does not settle on 5V. With disabling SDA, SLC and other individual ICs I achive nothing. My guess is that the processor does not get the return info from an IC, (which is constantly addressing it), presumably the tuner. A few times I have noticed schematics (in Elektor) which enables technician to monitor the state on the IC2 bus with the help of an PC. Now I wonder if someone can help me get a Software with which I would be able to analize what is going on on the I2C bus. I wish to find out, (on the address which is addressed by processor), which component does not answers processor's request. I think this would help me locate the problem. Help would be greatly appreciated. ---------------------------

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09-17-2004, 19:21	#2 (permalink)
mister_e Junior Member Join Date: Jun 2004 Age: 51 Posts: 33 Member: 70424 Status: Offline Thanks Meter: 0	hi microera, i got this problems a few times. in my cases some eeprom adresses was corrupted. try to find a tv with the same chassis board and copy eeprom to a new one. Try to find eeprom # begin by 93C or 24C. I don't know if will help but that was my results for my specific cases. let me know. many regards Mister_e