Motorola V998 mobile phone display control and power supply is the stand is connected by soft cable with the motherboard interface, the display section by the liquid crystal display and cable, due to the reason of its design, the liquid crystal display less damage, general questions and more, including row online, some on certain routes open, and some short-circuit between the line and the line, resulting in the display is not normal or even does not boot. If it is caused by poor contact, after reinstalling the general troubleshooting. Nokia phone displays the maintenance of the circuit. Nokia mobile phone?s display circuit is relatively simple, display interface uses a serial manner, the negative pressure generating circuit described below to the Nokia 8210 mobile phone for example. More details and requirements will be described for production of??? ? cell phone jammer .
Nokia 8210 mobile phone display circuit by microprocessor D200, LCD H300 and other components, the display using the serial interface, which the VDD pin of the display for the positive voltage input, SCLK for serial clock signal input, SDIN The serial data signal side, the D / C for the control signal terminal, the SCE-chip select terminal, VSS is the ground, VOUT is the negative pressure side, the RES is reset side. Displays the circuit shown in Figure 10-3. Fault the general performance of the LCD does not display, such as display light. The screen does not display or display of light, first we should distinguish between the poor display and display interface or circuit is bad, generally speaking, the display circuit failure rate is relatively low, indicating non-performing multi-display conductive rubber caused by poor contact. Carry out the incoming test and inspection of raw material of producing? ? cell phone jammers strictly.
Fell a machine or machine water, no display fault most of the damage to the display. If the circuit failure, the application of multimeter measurement display interface circuit voltage to determine belonging to supply the normal cause, or caused by the transmission of data and control signals is not normal. In addition, the software failure will cause the display is not normal, but the repairs are few and far between. Ericsson phone displays the overhaul of the circuit. Ericsson series mobile phone shows the circuit using the serial interface, and the contrast control circuit is more special, introduced following the Ericsson T28 mobile phone, for example, the display part of the circuit shown in Figure 10-4. The display then H 1 foot display control side VLCD. The working instruction of? ?? phone jammer also should be renewed as necessary to meet needs of the times.
Is mainly used to adjust the display contrast of the display, the D600 unit (CPU) of M13, B14, pin output pulse width modulated signal (PWM) by C634, C635, C636 sent to dual-diode V611, V608 is rectified to produce the VLCD, the voltage by R807, R808 partial pressure, the output sampling the signal sent to the multi-mode converter is the N800, the sampled signal into a digital signal, and then return to the CPU, the CPU output duty cycle of the PWM signal to adjust, to produce the correct the VLCD VLCD voltage is too high, the screen display darker, and vice versa shallow. Under normal circumstances, the display then of El 2 the foot VDIG supply terminal voltage of 2.8V, 3 feet of data end DAT and 5-foot clock terminal CLK voltage is 2.8V.? ?? cellphone jammer has the high quality and performance of palm and mini size and high portability.
One foot the VLCD side of voltage to 6V. Display interface shown in Figure 10-5. It can be seen from the above analysis, regardless of the display is bad, bad or display of display interface circuit problems are caused not displayed correctly or do not show the failure. In addition, the software failure may cause the phone is not displayed. Samsung phone displays the maintenance of the circuit. Display circuit of the Samsung mobile phones are generally more complex, Samsung A188, A288 mobile phone, for example, described below. Samsung A188 display connection diagram shown in Figure 10-6. Maintenance, should focus on examination of the relevant circuit of CN603 display row header to connect the seat, LCD monitors and U201 unit (CPU). CN603 of 21 and 22 feet the BATT (3.7V), CN603 the ugly, two feet 3V voltage, will cause no display fault. The manufacturer should purchase the raw material of???? cell phone blocker from the qualified supplier.
When The CN603 the 5 to 12 feet missing 3V pulse heart may cause the display to lack of line failure. Display software, cable, capacitor C1, C3, C4, C5, C6 ~ C10, C13 to leakage, failure, there will be no display fault. LCD assembly shown in Figure 10-7. Samsung A288 with dual display, the addition of a small round screen on the phone outside the board, thus breaking the conventional folding mobile phone caused by the built-in screen to view information, the receiving phone is not convenient phenomenon. A288 uses two LCD modules, one large and one small, one main and one auxiliary. The main display (screen) resolution of 128?64 pixels, high resolution LCD; auxiliary display (screen) resolution of 64?64 like rate. For the antenna of???? cell phone jammer?? is built in.
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