Is the trigger circuit related information normal?
After the standby condition detection is normal, the trigger signal in the trigger circuit is detected whether the jump-off is normal or not. The common trigger signals are PWRBITN#, SLP_S3#, PSON#. Trigger circuit maintenance methods are as follows.
(1) First distinguish the main board trigger circuit working mode, common main board trigger circuit work as follows.
Intel, nVIDIA, AMD chipset motherboard: Switch, IO chip, south bridge chip, IO chip green wire.
VIA chipset motherboard: Switch south bridge chip transistor green wire.
SIS chipset motherboard: Switch South Bridge chip green cable.
Intel original motherboard: Switch South Bridge chip IO chip, detect CPU green cable.
IBM, DELL motherboard: Switch South Bridge chip IO chip green cable.
(2) Measuring the corresponding trigger signal.
a) Most of the motherboards are triggered by IO chips in the existing motherboard maintenance, so to measure the trigger signal you must measure the IO chip-related pins. Common IO chips trigger pin as follows.
Pin of IT8702, IT8712, IT8716, 1T8718, 1T8720, IT8721, 1T8726, 178728: 67 powered, 75 72 71 76 (GB plus 31).
IT8758 pin: 2, 31 power, 35 33 32 36.
Pin position of W83627: 61 Power, 68 67 73 72.
Pin position of F71872: 67 power, 75 72 71 76.
Pin position of F71862, 71882, 71883: 68 electricity, 80 81 82 83.
Pin position of F71889: 65 power supply, 76 77 78 79.
Note: IT8705, W83697, W83687 are not triggered.
b) The trigger circuit block diagram commonly composed of Huabang and Lianyang I 0 chips is shown in figure 3.
(a) Huabang (h) Lianyang
figure 3 IO chip trigger block diagram.
Huabang and Lianyang 1O chip corresponding to normal foot jump mode: trigger switch before triggering switch triggering switch after.
W83627 Series.
The 68 pin are high level low level high level.
The 67 pin are high level low level high level.
The 73-pin is low or high-level continuous high-level.
The 72-pin is high-level sustained low-level.
ITE series (except IT8711).
The 75-pin is high-level low-level high-level.
The 72-pin is high-level low-level high-level.
The 71-pin is low or high-level continuous high-level.
The 76-pin is high-level sustained low-level.
(3) Abnormal maintenance method of trigger signal.
Using W83627 series IO chip motherboard, trigger circuit maintenance ideas are as follows. a. if the switch does not have a high level, check the pull-up resistance, capacitance, and IO chip of the switch for damage.
b. if the switch has a high level, but presses the switch 68 pin without jumping, check the line (run) from the switch to 68 pin.
c. if the 67 pin in front of the switch do not have 3.3V, check first whether the power supply to the IO chip is normal or not. If normal first change the IO chip, and finally change the South Bridge chip.
XC95144XL-10TQG100C IC CPLD 144MC 10NS 100TQFPザイリンクス社の価格はいくらですか。
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Where can I order 5M160ZT100I5N IC CPLD 128MC 7.5NS 100TQFP Intel FPGAs/Altera?
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What are the applications of regulator?
1. Voltage regulator is introduced.
The commonly used voltage stabilizers on the main board are 1117 1084U 1085U 1086N 1087U EH11A3804 L1284N RT9164 and so on. The 1117 regulator (see figure 1) is the Low DropOut regulator, LDO, on the motherboard that adjusts the input voltage to a stable voltage output. This adjustment is a step-down adjustment, and the input voltage must be higher than the output voltage.
The 1117 regulator has two types of fixed output and adjustable output. The surface of the voltage stabilizer is marked by fixed output (see Fig. 1) and the unmarked one by adjustable output. In the actual circuit, it is also possible to detect whether there is a positive signal in the first pin of the regulator, if the resistor is connected between the one pin and the second pin, the output is adjustable, and the direct grounding of the pin without resistance is a fixed output.
2. Application of regulator.
Adjustable output voltage regulator 1117 as shown in figure 2, 3-pin input, 2-pin output, 1-pin grounding. IN is the input pin, OUT is the output pin, and ADJ is the voltage adjusting pin, which is grounded by resistance and connected with the output pin through a resistor. When used on the motherboard, the output voltage of the two pins is adjusted by the magnitude of the R1 and R2 resistances connected by the one pin. The output voltage of LM1117 is adjustable at 1.2V and the input voltage is up to 12V.
3. Precision regulator 431, 432.
The 431 is an internal device with a 2.5V precision reference source, while the 432 is an internal integrated 1.24V precision voltage stabilizer. The common 431 has three pins: cathode, anode, and ref, as shown in figure 3.
Working buried: cathode and anode conduction when the reference pin voltage is higher than 2.5 V, and anode cutoff when the reference pin voltage is less than 2.5 V.
LM431 is used to generate 2.5V reference voltage on the motherboard. As shown in figure 4, VCC3 outputs a 2.5 V VREF25 reference voltage after passing through R166 current limitation through 431 stable output.
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What is the application of crystal oscillator?
1. Introduction of crystal oscillator.
The function of crystal oscillator is to produce the original clock frequency. The crystal oscillator frequency is doubled by the frequency generator and becomes a variety of clock frequencies in the computer. It is sent to each device on the main board to make the equipment work normally.
2. Crystal oscillator code.
The crystal oscillator is represented by the letter X or Y. For example, X 2 represents the second crystal oscillator on the motherboard.
3. Crystal oscillator circuit symbol.
The symbols used in circuit diagrams are shown in figure 1.
4. Crystal oscillator common model.
32.768kHz crystal oscillator is used to provide reference frequency for RTC (Real Time Clock) circuit in Nanqiao chip. If the 32.768kHz crystal vibration damage will result in no boot, no reset, no running code and so on, the failure will not be the same in different motherboards. The 14.318MHz crystal oscillator is used to generate the reference frequency of the clock chip, which causes the whole board to have no clock signal when damaged. The 25MHz crystal oscillator is used to provide the reference frequency for the network card and some South Bridge chips. The three common crystal oscillations on the motherboard are shown in figure 2.
5. The quality of crystal oscillation is judged.
The results are as follows:
(1) using oscilloscope to measure the waveform and frequency of crystal oscillator, the frequency is the same and the difference is bad. (2) the method of substitution is used to judge the quality of crystal oscillator. 6. Crystal oscillator application circuit.
For example, the principle of crystal oscillator is shown in figure 3. Intel-NH82801GB Nanqiao chip is supplied with VCCRTC real time clock power supply and RTCRST# real time clock reset, and 32.768kHz crystal oscillator is supplied with 32.768kHz frequency from crystal oscillator to real time clock circuit of south bridge chip. Let the real-time clock circuit work to save CMOS settings (e.g. time, date, startup item, etc.).
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What are the characteristics and shape and measuring range of digital multimeter?
1.Characteristics of panel shape, measuring range and polarity of watch pen.
Digital multimeter has the advantages of small volume, high precision, visual display, moderate price and so on. It has been widely used in electrical and electronic measurement.
2.Panel shape and measuring range.
At present, the digital multimeter is mostly used in DT-890. The DT-890 digital multimeter panel is shown in figure 1.It can automatically display the units and symbols of the measured values, such as Ω, kΩ, MΩ, mV, V, mA, A, μ F, etc. In addition to DC voltage (200mV~1000V), DC current (2mA~20A), AC voltage (2V ~ 700V) and HFE, additional test blocks such as AC current (200mA~20A) and capacitance (2000pF~20 μF) have been added.
3.Characteristics of pen polarity.
The red meter pen of the digital multimeter is the positive pole of the power output, and the black meter pen is the negative polarity of the power supply, contrary to the polarity of the pointer multimeter, this must be fully noted.
This article is from Allicdata Electronics Limited which offers a varity of digital multimeter for selecting.
