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: Lithuania Vilnius Age: 28 Posts: 765 Member: 51989 Status: Offline Sonork: 1575109 Thanks: 12 Thanked 119 Times in 30 Posts	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: 37 Posts: 46 Member: 135968 Status: Offline Thanks: 0 Thanked 9 Times in 4 Posts	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: Lithuania Vilnius Age: 28 Posts: 765 Member: 51989 Status: Offline Sonork: 1575109 Thanks: 12 Thanked 119 Times in 30 Posts	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 Rostov on Don Age: 30 Posts: 131 Member: 212944 Status: Offline Thanks: 5 Thanked 7 Times in 1 Post	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: Lithuania Vilnius Age: 28 Posts: 765 Member: 51989 Status: Offline Sonork: 1575109 Thanks: 12 Thanked 119 Times in 30 Posts	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: 32 Posts: 323 Member: 25852 Status: Offline Thanks: 0 Thanked 18 Times in 11 Posts	if CPU is dead no power consumtion ! you can test it by power supply !