RX TX Find
FIND OUT RX & TX BY FOLLOWING METHODS FOR CHINA MOBILES+
- It is tasted and also you can test it.
- 1= step is, we need to find GND from phone.
- 2 =step is, we should power on phone (operation with dead phone:
- phone must be 100% dead by software)and take multimater put it to voltage.
- 3= multimeter (-) line put it GND and with (+) line check each connectors
- , and usually Tx= 1.8v or 2.8v and Rx=1.7v or 2.7v
- it will be change by processor but strongly 1.7v or 2.8v not 3v or 4v)
- This way is too easy and you will save a more time.
- For example!
- You have got new brand China miracle phone with USB cable. It has got
- 12 pin. You must find (Infinity team give good Idea 1.2.3 punkts):
- = GND usually it has got 2 GND. (now we have got 10 pins)
- = We will uncheck USB + and USB- (VSS) just with checking by USB cable (now we have 8 pins)
- =By USB cable we also uncheck V bat+, ac adaptor + polarization (now we have 7 pins)
- =Now from this 7 pins you will find 1 or 3 not used pins (last operation we have 3 or 6 pins to find Rx Tx signals)
- = Now at last operation you should use good multimeter just to find Rx Tx with 1.7v-2.7v or 1.8v-2.8v
- WHEN PHONE IS POWERD OFF TX AND GND WITH MULTIMETER MAKING BEEEEEP
- (DIOD TEST OPERATION), WHEN PHONE POWERED ON IT WILL SHOW LIKE DIOD
- RESISTANS 600-700 OHM BETWIN TX AND GND.
- I think I have give for every body more information’s. Just try to
- find. If you find 2-3 phone signals and you will be profi mobile Tx and
- Rx signals finder.
- Some times you will not find with this method some phones, but why we have forum?
- This instruction will helpful for people who works in GSM repairing industry minimum 3-5 years.
- How to find pinout for unknown model:
- In most cases you need to know Gnd, Rx, Tx pins for flash/unlock
- operations. What do do if you don't have cable or you have new phone
- model:
ONE MORE
- 1. find Gnd pin (it's required step, you can't continue until
- you will know Gnd pin location)
- 2. find Charge pins (it's optional step, just to save your
- time during future research)
- 3. find +Battery pins (it's optional step, just to save your time
- during future research)
- 4. connect cable Gnd to phone Gnd
- 5. try to connect cable Rx/Tx wires to all phone contacts one by
- one (except Gnd, Charge, +Battery pins) and try to read flash from phone
- 6. if flash read procedure can start this means that pinout found Ok
- and you can make other operations
- Note about "Chinese models": a lot of different phones with the same
- name exist on market (as well as many different name phones with the
- same pinouts), so, if you see in our "cable selector" wrong pinout for
- "Chinese models"it's good idea to find correct pinout acording to above
- instruction and send found pinout information with full text from phone
- back label to.
No comments