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Message: <blockquote data-quote="laal" data-source="post: 10454657" data-attributes="member: 94459">Basic and Useful Info About China PhoneWhat is TX RX?tx rx is  type of connection which will help to you to connect your phone with pc  for software operation. its just a type of connection name.what is cpu?Central  processing unit. A parts of phone. its type a head of phone. all phone  have cpu but for china phone cpu is very important. china phone have  various type of cpu. why cpu is important for china phone?all phone  have cpu, uem. but for china phone cpu is very important because  various china phone cpu support various tool/device when it do software  operation in phone. so though not know which phone have which cpu face  problem when you repair it.How to know cpu type/model?now many  of device auto detect cpu type so no problem to know which cpu use in  this phone which you want to repair. also you can open the phone and can  see what cpu use in phone.MTK<img src="http://www.phones-china.com/images/MTK.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Spreadtrum<img src="http://www.52boda.com/1189849878/wind/zhanxun.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />Infineon<img src="http://www.phones-china.com/images/Infineon.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Sky/Skyworks<img src="http://www.phones-china.com/images/SKY.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />ADI/AD<img src="http://www.phones-china.com/images/ADI.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Philips<img src="http://www.phones-china.com/images/philips.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Agree<img src="http://www.phones-china.com/images/AGERE.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />TI / Power Management<img src="http://www.phones-china.com/images/TI.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> VIASAMSUNGalso come new CPU name is SI4904what is flash chip and RAM?flash  chip store phone software in it. and RAM is extra built in memory which  give space to phone and flash chip to extract phone software and  operating in his memory when phone is open/running. 99% china phone  flash chip and RAM include in one chip. so though your flash area or ram  area is damage in flash chip, you must need to change total chip.  useing many type of companies chip with under various model name, as  like Samsung, Toshiba, Intel, ST etcFlash chip name/model is important for china phone as like cpu?must. its  important as like cpu because when flash china phone though we not know  what flash chip use on it, we can find perfect flash file for it.  otherwise with wrong chip flash file phone is going dead.what problem with china phone model name?model  name is not a big matter for china phone. because with same name have  many many phone with deference pcb, pcb design, cpu, flash chip, gate  up, software etc. What need to know about a china phone when we repair?1. CPU Type2. Flash Chip model3. Original software/flash file version.4. Connector Type5. How pin have in connector.Flash file version is important for china phone?Must. its  very very important for china phone because though you lost your  original (when manufacture company published phone) flash version or not  know which file have in it first time, you got problem when you flash  your phone. for flashing with wrong version/model flash file you got  this type of problem-1. Flash done but phone dead2. white screen (no incoming/out going call)3. white screen (with incomeing/outgoing call)4. Keypad not work5. Sim not valid6. Sim blocked7. Phone hang after power on8. no network9. have network but show emergency (this problem also do for power ic or bad connect sim or sim connector problem)10. phone restart continuously.<img src="/styles/default/xenforo/smilies/default/rolleyes.gif"  class="smilie" loading="lazy" alt=":rolleyes:" title="Rolleyes    :rolleyes:" data-shortname=":rolleyes:" />etc. Which tool or device?many of  free tool published in market for mtk, infineon, ad, spreadtrum, sky  etc. but alwayes device give you a complete solution. </blockquote>

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