Daes exist way how to chek cpu ram flash without remove from PCB? - GSM-Forum

stylius · 08-02-2006, 15:16

Daes anybody know diagram for Cx65, C65 and other siemens phone?

424owe · 08-05-2006, 11:39

long time ago -the JTAG interface was accessable - to execute a Boundary-Scan test - to test connections between different boundaryscanable parts. (E-GOLD, GAIM, Halfrate-CoPro, DSP) Also ram and Flash connections were tested tricky, becouse they have no Boundaryscan interface. They generated 0x00 , 0xFF and 0x55 on Data / Adressbus- this was readout via the boundaryscan interface. (in production on error message was "ram Adress 5555 has not value 0x55").

But JTAG is not really accessable anymore.
JTAG pins are : TDI (TestDataInput)- TDO(utput) - TMS(TestModeSelect) -
TCK (TestClock) - MON1 (Monitoring1) - MON2 (always named "TESTPOINT").

Note:
Its long time Ago that i've repaired phones... there is no guarantee.

greets from sunny Duisburg

stylius · 08-06-2006, 22:15

Thanks for you answer... But how to check cpu? without removing it from PCB?

vitpod · 08-07-2006, 04:50

only one problem of cpu i know for this phones - not working keyboard!
other problems are the broken wires of PCB under the CPU...
i think there is no problem to desolder flash and look under it... no reballing need to solder it back `cause of HUGE solder balls

stylius · 08-07-2006, 11:15

Yes, i agree with you... But sometimes i get dead phone, and dont know is cpu good or not.

kobolt · 08-07-2006, 11:40

if CPU is dead no power consumtion ! you can test it by power supply !

424owe · 08-12-2006, 07:46

Quote:

Originally Posted by kobolt

if CPU is dead no power consumtion ! you can test it by power supply !

thats wrong, there ist also power-consuption if the phone is dead or cpu is dead , the value can tell you something about the failure.

I've written some essays about it in this forum - use search button.

greets from rainy cold Duisburg

08-02-2006, 15:16	#1 (permalink)
stylius No Life Poster Join Date: Feb 2004 Location: Europe Age: 39 Posts: 1,057 Member: 51989 Status: Offline Sonork: 1575109 Thanks Meter: 145	Daes exist way how to chek cpu ram flash without remove from PCB? Daes anybody know diagram for Cx65, C65 and other siemens phone?

08-05-2006, 11:39	#2 (permalink)
424owe Major Poster Join Date: Apr 2005 Location: Duisburg - Germany Age: 48 Posts: 46 Member: 135968 Status: Offline Thanks Meter: 9	not really long time ago -the JTAG interface was accessable - to execute a Boundary-Scan test - to test connections between different boundaryscanable parts. (E-GOLD, GAIM, Halfrate-CoPro, DSP) Also ram and Flash connections were tested tricky, becouse they have no Boundaryscan interface. They generated 0x00 , 0xFF and 0x55 on Data / Adressbus- this was readout via the boundaryscan interface. (in production on error message was "ram Adress 5555 has not value 0x55"). But JTAG is not really accessable anymore. JTAG pins are : TDI (TestDataInput)- TDO(utput) - TMS(TestModeSelect) - TCK (TestClock) - MON1 (Monitoring1) - MON2 (always named "TESTPOINT"). Note: Its long time Ago that i've repaired phones... there is no guarantee. greets from sunny Duisburg

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08-06-2006, 22:15	#3 (permalink)
stylius No Life Poster Join Date: Feb 2004 Location: Europe Age: 39 Posts: 1,057 Member: 51989 Status: Offline Sonork: 1575109 Thanks Meter: 145	Thanks for you answer... But how to check cpu? without removing it from PCB?

08-07-2006, 04:50	#4 (permalink)
vitpod Freak Poster Join Date: Dec 2005 Location: RUSSIA Age: 40 Posts: 160 Member: 212944 Status: Offline Thanks Meter: 10	only one problem of cpu i know for this phones - not working keyboard! other problems are the broken wires of PCB under the CPU... i think there is no problem to desolder flash and look under it... no reballing need to solder it back `cause of HUGE solder balls

08-07-2006, 11:15	#5 (permalink)
stylius No Life Poster Join Date: Feb 2004 Location: Europe Age: 39 Posts: 1,057 Member: 51989 Status: Offline Sonork: 1575109 Thanks Meter: 145	Yes, i agree with you... But sometimes i get dead phone, and dont know is cpu good or not.

08-07-2006, 11:40	#6 (permalink)
kobolt Freak Poster Join Date: Apr 2003 Location: Dublin Age: 43 Posts: 363 Member: 25852 Status: Offline Thanks Meter: 31	if CPU is dead no power consumtion ! you can test it by power supply !