手机开机后定屏白屏)（The phone is switched on and the screen is white.）.doc

手机开机后定屏白屏)（The phone is switched on and the screen is white.） The maintenance method of the screen white screen and fixed screen green screen after the mt phone is turned on The 2010-06-17 and The maintenance method of screen black screen and black screen is determined after the mobile phone is turned on 1 boot not maintain maintenance First to see if the power 6305 33 feet 2.8 maintain voltage, if you have it in the power supply, if not the CPU to tear open come down to see the power of 33 feet CPUC3 have foot bolt... And you cant exclude software... 2. If a MT cell phone is just a CPU bad morning, it can be determined that there is a difference between 32.768 points 3 -- CPU6218, power supply 6305 -- 4. The following voltage is not turned on, and the 7 feet of the power supply to B + have a 0 o resistance, and the short answer is OK. Its near the power supply The 4MT cell phone does not recognize the card 100% of the power supply of 8 and 27 5 the MTK.. Hear echo spreadtrum. Make a phone call to each other, kill a call each other hear echo, - many new, maintenance train of thought as follows, 1. When take off the receiver. Echo, 2. JingJian space turns out to be two of the receiver loop inductance, inductance is low. (location: and the receiver first black series inductance, one on each side. Remember not grounding the) 3. Solve, to remove them directly, instead of the resistance of the 18 to 25, too little resistance will have echo, too large the receiver will be in a low voice. 6305 power supply machine for MTK series. Because its platform is general and special, the screen light is not bright can be repaired this way. Whether or not the original machine is in parallel or in series, it is changed to parallel, and then the anode is connected to b +, and the negative pole is connected to the power of IC41 #. You can fix all the MTK screen lights. The principle is that 6305 is a screen light that signals the signal, and B + goes by the light to the 41st of 6305. Wh