Nokia 7270 Service Manual

Issue 2 03/2005

Nokia Customer Care

COMPANY CONFIDENTIAL

Issue 2 03/2005

In flash programming error cases the flash prommer (via Phoenix or Darium) can give some
information about the fault. The fault information messages could be:

• Phone doesn't set Flashbus TXD line high after VCC is switch on.

• External RAM test failed.

These errors are some of the most common errors and based on this, a fault finding diagram
for flash programming is shown below. Various errors can appear from the prommer when
flashing the phone - not all of them can be directly linked to the HW or phone.

Because of the use of uBGA components, it is not possible to verify on the diagram, if there is
a short circuit in control and address/data lines on TIKUEDGE, NOR flash or SDRAM.

Figure 2: Flash programming doesn’t work

Flash programming does not work

Prommer information is:

External RAM test failed.

(C108)

Prommer information is:

Phone does not set Flashbus TXD

line high after VCC is switched on.

Check SDRAM orientation and

placement. OK?

Re-solder/Replace

component

Check PWB (if possible) and

power lines. Connections OK?

Fix the connections

if possible. Else

scrap the phone

Replace the SDRAM

Flash again

Check J3401, R3400, R3403,

R3405. Connections OK?

Try reading MCU ID with

Phoenix. Reading OK?

Try reading flash ID with

Phoenix. Reading OK?

Re-solder/Replace

component

Replace UEMEK

or TIKU

Replace NOR

flash

Yes