vom multimeter

debugging the camera, you can use an oscilloscope to measure the waveform based on this schematic to verify that the code is correct. It is also worth noting that it is best to use a multimeter to measure whether each pin of the camera is correctly connected to the chip before the development driver. Otherwise, the image will not be visible even if the code is correct. Mt9d111 is an image sensor chip with a CMOS interface. It can sense external visua

display internal synchronous circuit, or connect the interface pins and transmission cables above. Troubleshooting: In view of the LCD internal synchronous control circuit is generally set in an integrated circuit inside, and the possibility of damage to the integrated circuit is negligible. So the author will check the focus on the interface pins, transmission cables and synchronous circuit of the adjustable elements above. First, the shell of the liquid crystal display to open, exposing the

overhaul. 5, in addition, can also use the multimeter to detect the output voltage of the power box is normal, the laptop socket is loose, whether the switch has a role, or can be turned on but the light does not light, it may also be led aging. Second, the power supply light has been flashing 1, if refers to the notebook external power (adapter) on the power indicator light flashing, then the adapter is usually caused by internal instability, at

power supply interface, each test will be connected to the power supply, simply do not pick up the test once, unexpectedly started, and also passed the self-test into the desktop. After repeated tests found that, as long as the connection to the power supply, the computer can not start. Fault analysis: The author suspected that the auxiliary power supply circuit of the video card has short circuit. But there is no multimeter on hand and no second gr

welding, will make U disk plug into the computer without any reflection. Sometimes the U disk shake the computer can be identified, you can determine the USB socket contact bad. The problem can be solved simply by mending the weld. Voltage Regulator IC: Also known as Ldo, its input 5V, output 3V, some of the inferior u disk voltage Regulator IC is very small, easy to overheat and burned. There is also a USB power supply will also cause voltage regulator IC burned. The input voltage and output

, according to the fault phenomenon, deduce the nature of the fault, then according to this inference, using multimeter, logic pen, oscilloscope and other tools to check the hardware line on the corresponding signal whether there is random interference or timing drift, if there is to find the appropriate hardware for repair and replacement. First check to see if there is a contact failure. Remove various expansion cards from the shutdown state with th

monitor to make sure the monitor is fine. If the monitor is not a problem, see if the CPU fan is running, such as running, using a multimeter to measure the voltage output is normal for ±12v, ±15v, if not normal can be changed to a power supply to try. If the black screen still appears, remove the components installed in the computer, leaving only the CPU, video card, memory, you can limit the cause of the failure of the CPU, motherboard, memory

power supply pipe to the ground 0 ohms or nearly 0 ohms, this time must be said that the motherboard chip on the ground short-circuit phenomenon caused by ATX protection. For Yellow Line 12V short circuit is usually the power management itself and 12V filter capacitor short-circuit, for 12V short-circuit also may be a serial chip problem. For the Purple Line short circuit may be the South Bridge, I/O, Fet and gate circuits, as well as the Purple Line filter capacitor and violet line voltage re

the substitution method to replace the same specification of memory for inspection. Of course, if the apparentSave is integrated on the motherboard, we can only send repair. Six, capacitance issues Ramdac (Random Access Memory digital-to-analog Converter) and filter capacitors are two important factors that determine the quality of the graphics screen. And the entire filter circuit work quality and capacitance quality is mutually linked, when the use of inferior capacitance or due to the ca

alcohol cleaning, the deformation of the spring plate shape, and remove the oxide layer, under normal conditions can be restored. If the above processing is invalid, you must open the hard drive body. Choose a dust-less environment, unscrew the front cover of the hard drive screws (some with glue-bonded). When you remove the front cover of the hard drive, you can see the disk surface clearly. First, the digital multimeter is used to detect whethe

too large, will also lead to frequent host of the crash or restart. For this case, we use a multimeter to test its voltage is normal, it is best to replace a good power supply for replacement removal. solution: Now for high-quality high-power computer power. 4. Main engine switching power supply plug loose, bad contact, no tight this situation, most will appear in the DIY machine, the host power supply cable with no 3C certification, and power out

In some cases, our Soyo motherboard does not start, what should we do? Then the following from the study of small knitting to tell you that the Soyo motherboard does not start the solution it, hope can help you Oh! Soyo the motherboard does not start a workaround: 1, CPU aspects of the problem CPU does not have power: Use the multimeter to test the three (or one) field tube around the CPU and three (or one) rectifier diode, check the CPU is damaged

First, check that the monitor cable is securely plugged into the host interface, and then check that the video card is in good contact with the motherboard I/O slot. If necessary, please remove the graphics card and reseat it once to ensure that the placement is in place and the contact is good. Second, verify that the monitor is damaged If your monitor and video card are securely installed, try a different, confirmed monitor. If the screen is no longer black, the reason is that the monitor

check the 5V voltage is normal, because a/D driver Board MCU chip operating voltage is 5V, so find the failure of the machine, first use a multimeter to measure 5V voltage, If there is no 5V voltage or 5V voltage becomes very low, then one may be the power circuit input level problems, that is, 12V to 5V power supply part of the problem, this fault is very common, check 5-terminal voltage regulator block (common model 8050sd-lm2596-aic15-01, etc.) A

a stable power supply, the signal has the appropriate delay time. The performance of the power supply will not be provided, directly from the 5V signal power supply, this will lead to the motherboard CMOS memory failure. When the power is added, it will not be able to boot normally or produce intermittent reset action. When the above fault occurs, the most simple, intuitive diagnosis and solution is to use the "replacement method", and find a similar size, the type of power supply rod for the

the working state, backlight is always lit. In other words, the high-voltage generation circuit has not been controlled by the switch, that is, the motherboard to the High-voltage generator circuit issued by the switch signal lost control. Because the motherboard microprocessor sends out the switch signal generally to pass through several transistors to control, therefore the fault may be the control switch signal transistor damage. The thinking of fault maintenance for the screen of the boot

box is normal, also simply think is the power of things, just want to software aspects. Finally did not have, picks up the multimeter one to measure the voltage, does not have the +5v voltage. A check power cord, found that because of many times, the +5v red line has been broken, but in the outside but still can't see out. A little problem but the boss's strength. 4.IDE Interface Damage If the CD-ROM drive is missing and the optical drive is not av

., are likely to cause the above fault. Failure response: In order to ensure that the motherboard capacitance on the voltage is not too high, should ensure that the power supply through the regulator filter, do not let the computer long-term work, resulting in capacitor overheating; you can use the multimeter to detect the transistor around the CPU, diodes, whether the work is normal, in order to check whether the If there is a broken needle or fract

down. (6) Because at this time the battery temperature is high, should not be turned on immediately, let the battery cool for a while, plug in AC power. (7) Boot the computer with a floppy disk, the file will automatically run the Refresh program, and ask the user whether to proceed. (8) At this time, the refresh program began to refresh the battery, the process is very fast, when back to the DOS prompt a:>, indicates that the refresh has completed. (9) Turn off the computer and charge the

U disk's composition structure is relatively simple, mainly by USB plug, crystal oscillator, the main control chip, voltage regulator IC (LDO), PCB board, SMD resistor, capacitance, Flash (flash), light-emitting diodes (LED) and other components. Also some u disk will be in usb+5v and voltage regulator IC string a 0 ohm maintenance resistor, now voltage regulator IC no 5V input voltage is it bad. Today many master control will LDO integrated into the main control, so you will see many U disk hav