REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Saturday, 9 February 2019

NOKIA - 6230 _ 6320B RH-12_RH-28 _ TROUBLESHOOTING _ REPAIR HELP

NOKIA - 6230 _ 6320B RH-12_RH-28 _ TROUBLESHOOTING _ Repair Help





PHONE IS DEAD

  • This means that the phone doesn't use any current at all when supply is connected and/ or power key is pressed.
  • It is assumed that the voltage supplied is 3,9Vdc. UEME will prevent any functionality at battery/supply levels below 2,9Vdc and the software will shut the phone down at 3,1Vdc.
Phone is dead


Yes



Measure voltage on L260, L261,
L262, L263, L264, L265 and L206.
Should be ~3,9V
No
Failure in VBAT line:
Check X100, L260, L261, L262,
L263, L264, L265, L206, C260,
C261, C262, C283 and pwb
Yes



Measure voltages on both sides of
R302 when power key is pressed.
Should be ~0V.
No
Check R302, S323 (power key) and pwb
Yes


Sleep clock on J401:
~32,768kHz, 1,8Vpp
No
Check:
B200, C209, C210, D200 and
PWB
Yes


Measure voltage on PURX =
1,8Vdc on J404 or N131 pin 3
~1sec after power key is pressed
No
Check D200 and pwb
Yes


Measure voltage on VR3=2,78Vdc
on C295 pin1
No
Check D200, C295 and pwb
Yes


Verify that system clock is @
~26MHz, min 300mVACpp on
C422 pin2 towards D400 (TIKU)
with regular probe Cin ~10-13pF /
10M

Yes

Check:
D400 (TIKU) and D450, D451
(Flashes) and D455 SDRAM
No
Check C422, R420, C514, C515, L515,
N500 (Helgo), G501 (26MHZ
XTAL) and pwb.
PHONE DOESN'T STAY ON, OR PHONE JAMMED
  • If this kind of a failure is presenting itself immediately after FLALI, it is most likely caused by ASICs missing contact with PWB.
  • If the MCU doesn’t service the watchdog register within the UEME, the operations watchdog will run out after approximately 32 seconds. It is not possible to measure this service routine.
Phone doesn't stay on or phone is
jammed


Yes


Sleep clock on J401:
~32,768kHz, 1,8Vpp
No
Check:
B200, C209, C210, D200 and
PWB
Yes


Verify that system clock is @
~26MHz, min 300mVACpp on
C422 pin2 towards D400 (TIKU)
with regular probe Cin ~10-13pF /
10M
No
Check:
C422, R420, C514, C515, L515,
N500 (Helgo), G501 (26MHZ
XTAL) and pwb.
Yes


Measure voltage on PURX =
1,8Vdc on J404 or N131 pin 3
~1sec after power key is pressed
No
Check D200 and pwb
Yes


UI functionality and keys react to
pressure
No
Check:
D400, D450, D451, Z300, Z301,
UI-board, keymat, lightguide and
Pwb
Yes


Is everything working until phone
shuts down after ~32sec
Yes
Change D200 (UEME
No


Retest and if phone still doesn't
work change whole engine board





FLASH PROGRAMMING DOESN'T WORK.

The flash programming on RH-12/RH-28 boards is only possible via the pads on the PWB.
In case of Flash failure in production (FLALI station), problem is most likely related to SMD problems. Possible failures could be Short-circuiting of balls under μBGAs (e.g. UEME, TIKUEDGE, SDRAM, FLASH), missing or misaligned components.  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, NAND flash or SDRAM

SIM FAILURE

The hardware of the SIM interface from the UEME (D200) to the SIM connector (X386) can be tested without a SIM card. When the power is switched on, the phone first checks for a 1,8V SIM card and then a 3V SIM card. The phone will try this four times, where after it will display "Insert SIM card".
The error ”SIM card rejected” means that the ATR message received from the SIM card is corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent from card to phone.

DISPLAY FAILURE

Is display
working?


No


Measure Vflash1 @
L302 towards X302
(display connector).
Should be ~2,78Vdc
No
Check:
X302, C311, L302, C310,
D200 (UEME) and PWB
Yes


Measure VIO @ L301
towards X302 (display
connector). Should be
~1,8Vdc
No
Check:
X302, C309, L301, C308,
R307, D200 (UEME) and
PWB
Yes


Are LED's working?
Measure Vout on
C304 = ~13,5V
No
Check:
N300, C304, R308, R312,
R306, X302, R305, X300, pwb
and UI board
Yes


Measure RESX on
X302 - pin 24. Should
be ~1,8V
No
Check D400 (TIKU) and pwb
Yes


Phone should work. If
not change engine
board
Posted By: FRANK at 04:27
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