Need pinout on CPU for Motorola T205\T2688 - GSM-Forum

sed_alex · 11-20-2002, 21:29

Please help!

T205 not press any key (only Power on button, if phone OFF)

If who has pinout the Processor - > keyboard on Motorola T205 please help, I have found 2 short circuit buttons and now it is necessary to trace where exactly there is a short circuit, but to make it without the shem it is simply impossible.

Short circuit buttons - Pointers "UP" and "Down" ( The points at the centre of the button has come short among themselves)

Thank You....

Best regards,
Alex Sed

sed_alex · 11-24-2002, 17:18

I find one problem in T205 (from for hit of water there was a short circuit under the processor after removal it and washing by spirit the problem of short circuit 2õ of buttons left, but find next:
The normal resistance at the switched off device between GND and any conclusion of the processor going on the button (except for the button PWR ON) should be at a level 2mOm, at me resistance of an external rim of buttons "7", "0" concerning ground is equal 3kOm - and it not normally.
The microcircuits (CPU, Ram, Flash, RF-Interface ) were removed from a payment, the resistance and remained on level 3kOm.
Who that is what ideas in what can have problem?

Best regards and thank you,
Alex Sed

sed_alex · 12-08-2002, 17:18

Problem solved, after desolder LCD and wash PCB in Ultrasonic Clean Bath

Best Regards,
Alex Sed

11-20-2002, 21:29	#1 (permalink)
sed_alex Freak Poster Join Date: Dec 2001 Location: Russia Posts: 113 Member: 7928 Status: Offline Thanks Meter: 0	Need pinout on CPU for Motorola T205\T2688 Please help! T205 not press any key (only Power on button, if phone OFF) If who has pinout the Processor - > keyboard on Motorola T205 please help, I have found 2 short circuit buttons and now it is necessary to trace where exactly there is a short circuit, but to make it without the shem it is simply impossible. Short circuit buttons - Pointers "UP" and "Down" ( The points at the centre of the button has come short among themselves) Thank You.... Best regards, Alex Sed

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11-24-2002, 17:18	#2 (permalink)
sed_alex Freak Poster Join Date: Dec 2001 Location: Russia Posts: 113 Member: 7928 Status: Offline Thanks Meter: 0	I find one problem in T205 (from for hit of water there was a short circuit under the processor after removal it and washing by spirit the problem of short circuit 2õ of buttons left, but find next: The normal resistance at the switched off device between GND and any conclusion of the processor going on the button (except for the button PWR ON) should be at a level 2mOm, at me resistance of an external rim of buttons "7", "0" concerning ground is equal 3kOm - and it not normally. The microcircuits (CPU, Ram, Flash, RF-Interface ) were removed from a payment, the resistance and remained on level 3kOm. Who that is what ideas in what can have problem? Best regards and thank you, Alex Sed

12-08-2002, 17:18	#3 (permalink)
sed_alex Freak Poster Join Date: Dec 2001 Location: Russia Posts: 113 Member: 7928 Status: Offline Thanks Meter: 0	Problem solved, after desolder LCD and wash PCB in Ultrasonic Clean Bath Best Regards, Alex Sed