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Siemens Hardware Repair Area all about Hardware Repairing you can get if here. |
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08-02-2006, 15:16 | #1 (permalink) |
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? |
08-05-2006, 11:39 | #2 (permalink) |
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 |
08-07-2006, 04:50 | #4 (permalink) |
Freak Poster Join Date: Dec 2005 Location: RUSSIA Age: 41
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 |
08-12-2006, 07:46 | #7 (permalink) | |
Major Poster Join Date: Apr 2005 Location: Duisburg - Germany Age: 48
Posts: 46
Member: 135968 Status: Offline Thanks Meter: 9 | Quote:
I've written some essays about it in this forum - use search button. greets from rainy cold Duisburg | |
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