Weak current College】 【monitor troubleshooting simple recognition】.

<br> First, power corrupted judge <br> <br> For previously used knob adjusted 14 ", 15" the monitor power switch for hard switch. When you turn off the monitor power switch, the monitor's internal power supply is completely cut off .. And adopt digital monitor, its status is determined by the monitor's internal MCU control. When you turn off the power switch on the monitor, the monitor's power supply parts and MCU circuits Division is still in working condition. If you do not use the monitor .for a long time, it is best to unplug the monitor power plug. <br> <br> 1. power switch damage <br> <br> CNC panel power switch work in low-current status, their damaged very small rate. When .you insert the monitor's power plug, if you can hear a slight "crackling" sound, a description of the monitor's internal power supply is normal, and at the same time, the power supply fuse intact. If the monitor's power means no lights, most .cases are not bad, but the switch power circuit failed. 2. fuse of damage <br> <br> If the fuse is not damaged by replacing the fuse and fuse should be further identified the cause of the damage. The basic criteria are as .follows: <br> <br> ① clear transparent surface of the glass tube, internal fuse only a fuse. <br> <br> This is due to unexpected power circuit with surge voltage presence or because of frequent switching machines, there is also .possible that the working environment temperature is too low and unexpected fuse. Now you can directly replace the same model. Note: the monitor is in delay with color TV as insurance rather than ordinary fuse, 14, 15, 17 may use some of the 17 .3.15A to 5A fuse. For the use of ceramic package of the fuse, best use of the same model of substitution, to avoid frequent replacement of fuse. <br> <br> ② glassy tube surface yellow black sputtering of dirt, but to .be able to see the internal fuse fuse shape. <br> <br> This is usually the power circuit tube breakdown, breakdown of PWM control manifold. <br> <br> ③ glassy tube surface has a slight cracks, it is difficult to .see the internal situation. <br> <br> This is generally a 220V rectifier diode breakdown can be two, capacitance breakdown caused by short circuit. <br> <br> ④ glassy tube serious breakage. <br> <br> This is .generally less prone to many is powered directly caused by short circuit, you should carefully check the rectifier circuit, before degaussing coil. <br> <br> 3. the power cord is damaged <br> <br> Sometimes because of unexpected hard pull .or collision, power line or internal breakage when used to identify the substitution method. <br> <br> 4. plug the power cable from the monitor loose <br> <br> Some of the power cord plug because the specifications are not standards ., and monitors the power outlet is not tight, causing the anastomosis is bad, produces light is not lit when, on the surface, and monitor with no power. <br> <br> Second, whether there are abnormal sound <br> < .br> Monitor several inherent in the normal sound: degaussing circuit magnetizing voice (Bang Bang, and degaussing relay synchronization, sound close to overlap), internal degaussing relay voice (clicking twice in a row, interval 4S), the line circuit relay of sound .(a click of a sound or voice), high-pressure charge voice (squeaky voice of cheerleader for about 3 seconds). <br> <br> 1. definition of "pop pop" sound of high-pressure discharge <br> < .br> These are typically have ambient circuit FBT high pressure discharge phenomena. Return repair. <br> <br> Note: If the monitor has intermittent or continuous "pop pop" sound of high voltage discharge, this should be immediately shut down, or .because the high-voltage discharge, so that other components breakdown fault coverage, serious or even CRT scrap. <br> <br> 2. relay continuous action of "clicking" sound <br> <br> This is due to the mode fault .discriminant circuit or MCU. Return repair. <br> <br> Note: for CNC monitors, each boot, you have the "clicking" sound of degaussing pick-up sound, approximately four seconds after the interval, and then release. There are .also accompanied by S correction circuit of relays of closing sound, but this only in power-on time and change screen mode. <br> <br> 3. a slight "Squeak" sound <br> <br> Monitor internal slightly short circuit ., causing a power supply is overloaded. Return repair. <br> <br> Note: some display the monitor Panel switch, the monitor will have a comparison within the obvious "Squeak" sound, this is because the switch transformer to produce light, .itself. Have sustained a few seconds away, and some can always exists, unless you unplug the monitor power plug. However this is normal behavior. <br> <br> 4. weak weak "tapping" sound <br> <br> If .you have this kind of sound, sometimes accompanied by flashing power light and shade. This is because the power circuit have serious short circuit conditions. Return repair. <br> <br> 5. obvious "sand" sound <br> <br> .This typically monitor switch transformer grounding-loose. Return repair. <br> <br> Third, the smell of judgment <br> <br> For new purchases of the monitor, just post in a few days ago when used inside a plastic taste ., this is because the internal components of fixed using hot-melt adhesives or other glue classes and monitor internal switching power supply transformer windings and internal inner some inductance coil of insulating lacquer on the monitor when you distribute the work. <br> <br> .1. sour <br> <br> If you have this kind of taste, usually internal capacitance is overheating or overvoltage burst, capacitance of acid gas overflow. <br> <br> 2. Paste odor <br> <br> Generally monitor .internal heat source of Dafa pieces such as power tube, 2Very high resistance, and so excessive heat caused by the burning Board. <br> <br> 3. odor <br> <br> This usually is due to the monitor's high pressure nozzle .moisture leakage due to air discharge. <br> <br> 4. image correctly <br> <br> 1. a horizontal line <br> <br> ① one or both of the faint horizontal lines (about 0.2mm width) < .br> <br> For Sony telilong monitor because it uses the grid-like mask, in order to prevent distortion and mask with damper wires, 15 "as a root, 17" for both. <br> <br> ② number cm wide .grey or dark grey bar <br> <br> If the monitor is in the course of a few centimeters wide and deep color interference bars can be moved up and down and patchy, then you can determine the monitor line circuit parts soldered. <br .> <br> 2. vertical bar <br> <br> ① very fine thin vertical lines not easily noticeable <br> <br> For Sony telilong monitor, it may be because the temperature is too low, the Trinitron slight deformation caused by .this situation, when the temperature is normal in General. <br> <br> ② number cm wide grey or dark grey bar <br> <br> This is usually a component damage field circuit or a virtual welding. <br> <br .> ③ a thin line on the left <br> <br> The monitor on the left near the edge of a small thin lines, this is due to the current production technologies, but there is obviously a bit of a monitor, it is not .obvious. As long as it does not affect normal use are qualified products. <br> <br> ④ sides have s-vertical bar for vertical movement <br> <br> This usually is due to the monitor's power supply circuit rectifier diode individual .tube is damaged or high-voltage capacitor capacity decrease. <br> <br> 3. black point <br> <br> ① 1 or 2-3 very small black point <br> <br> Due to the present production process with .no guarantee of each CRT phosphor are fully functional, so individual monitor has 1 or 2-3 very small black spots, this is normal. <br> <br> ② large black spots <br> <br> The black point generally appear in .the Center, this monitor is energy star circuit failure because, in the center of the phosphor premature ageing. This situation cannot be repaired. ③ irregular beat black spots <br> <br> This is usually a monitor internal interference. <br> < .br> 4. highlights <br> <br> ① tiny white highlights <br> <br> With the little black dot, is the result of the production process. <br> <br> ② color highlights <br> <br> .Is due to condensation or oil drop splash to CRT surface light scattering phenomena. Scrubbed clean. <br> <br> ③ irregular white block <br> <br> For surface coating of the monitor is off due to surface coatings. Cannot be repaired .. <br> <br> ④ irregular occurrences of beating white or white lines, approximately 1-2 mm in diameter <br> <br> This usually is due to external strong signal interference. But the internal circuit fault when this phenomenon occurs. .<br> <br> 5. water ripple <br> <br> The current production technology and process also does not completely eliminate the monitor water ripple (also called a moiré interference), can only be reduced. Some customers have water ripple serious .called "Vortex". Sometimes it seems like the wind from one end of the monitor to the other end. When the monitor was turned on, it will be very obvious, but more than half an hour, this situation should be reduced or eliminated. .As long as interference in the allowed range, are fine. Monitor image edges slightly water ripple is normal, and focusing more clear water. We want to note: If you want to monitor to work properly must be given in a standard working environment, otherwise .there will be very strange. <br> <br> 6. blinking generally is due to the refresh rate is too low. But if you put the monitor's refresh rate to 75HZ above, the image still blinking as before, this may be the monitor .internal circuits. <br> <br> 7. jitter <br> <br> ① the entire image at the top and bottom pieces of a whole. <br> <br> Field circuit performance is not good. <br> <br .> ② the entire image around the whole at the same time. <br> <br> Line circuit performance is not good. <br> <br> ③ CRT screen just part of the region around the image dithering. <br> <br .> ④ image shading obviously, sometimes accompanied by image size changes. <br> <br> 8. fuzzy <br> <br> ① beginning clear, with the use of time more and more blurred. <br> <br> This is .the display of line scan circuit problems, possibly FBT (FlyBackTransfer) leakage drift and line pipe, backward diode, backward capacitance is not good thermal stability. This failure can only be returned for repair. <br> <br> ② just starting to blur ., over a dozen minutes or half an hour after the clear and normal. <br> <br> This is usually a CRT tube socket with damp. Mostly because the monitor is working environment humidity too much, the monitor is not often used, pipe .saddle moisture resistance increases. Failure to monitor small runs continuously for several hours to resolve. If a failure is serious then need to replace CRT tube block. <br> <br> ③ the entire CRTtank screen image blur, illegible text and image detail. .<br> <br> This is generally the focus potentiometer FBT mobile, or FBT leakage. If this is a fairly old CRT monitors are mostly caused by the aging defocus. If the potentiometer move by adjusting the resolution, if FBTLeakage can only replace the .FBT. <br> <br> ④ the CRT screen as an image like the wind moves in one direction. <br> <br> Now you can compare the OSD menu is also the same phenomenon. If not, this may be a faulty .video card. If Yes, this is the monitor's color processing circuit fault. <br> <br> ⑤ CRT screen areas with color banding. <br> <br> This is normally static and convergence performance of the monitor. When the monitor is .part of the magnetization is also the phenomenon. The need to adjust the player. <br> <br> 9. deformation <br> <br> ① just this post screen is small, a few minutes after the basic normal. <br> .<br> This is the display typical "respiration" is just too obvious. Normally the monitor at work, the image should not be significantly larger or smaller, if there is such a description of some components inside the monitor thermal stability. <br> .<br> ② image distortion. <br> <br> Image seriously distorted, adjust the OSD menu is still unable to return to normal or adjust normal after missing after shutdown, this shows the monitor's memory or MCU control circuit. <br> < .br> ③ When the monitor switch different work mode, the image changes significantly or 640 * 480 is also man screen, but in 800 * 600 with visible screen smaller, at 1024 * 768 down into a narrow strip, but the image content is complete .and clear. This is to monitor internal B + voltage automatically track circuit problems, typically line scan manifold problems or damage to the MCU partial functionality. <br> <br> 10. stain <br> <br> Screen with irregular palettes or in .part regional obvious bias one color or Dim, this is because monitors magnetized. If slightly magnetized, through the monitor itself degaussing circuit (Note: do not duplicate degaussing within half an hour.), If the monitor cannot itself, you can try degaussing rods .can be solved. But if they are monitor internal eruption bezel magnetized or its deformation, the artifacts are not removed. <br> <br> 11. partial color <br> <br> ① If display obvious lack a basic colors (R, .G, BTANK), this is the monitor signal pathway problems. Please check the 15-pin D-type connectors, see 1, 2, 3-pin is crippled. If you do not have the signal line internal breakage or tailgate circuit. < .br> <br> ② If the monitor screen and constant r or G, or B, and the adjustment is not valid, this is because the CRT internal pengji or tailgate circuit failure. ③ If you are the image of background obviously biased towards one .color, then you can try through the OSD menu of RGB adjust back to normal. If not, is the picture tube aging. <br> <br> 12. the monitor screen is too dark and brightness to the maximum <br> <br .> If the display brightness too dark but brightness adjustment is 100, you can enter the factory pattern to adjust the brightness of the Deputy. Because the monitor each mode in the display's memory has user data and standard data, when a user adjusts the monitor's MCU .to hold the current data and standard data to prevent monitor circuit protection. If the monitor's standard data from accidental changes, then the display too dark or too light. <br> <br> 13. monitor circuit too light and does not Dim <br .> <br> If the display brightness too light, even if the brightness is 0, the image is very light, this is the brightness of the control circuit automatically (ABL or ABC circuit) out. Such failure shall be the player for repair. .<br> <br> 14. shutdown after the screen has a bright spot, after about 3-5 seconds disappears <br> <br> This is because the monitor of highlights caused by breakdowns, shutdown cannot effectively block is still in the high .temperature of cathode to launch electronic screens, because no deflection circuits, electronic play on the screen, and a diameter of approximately 3-5 mm. If this situation occurs for a long time, will cause the screen center of phosphor premature ageing, produces screen .Center has a distinct dark spots. Such failure shall be the player for repair. <br> <br> 15. the monitor power light is on, but no image <br> <br> ① power with high pressure charging of sound, while .the power led is green, about 5-10 seconds after the led changes to Orange, and accompanied by loss of hypertension "squeaky La La" sound. You probably can tell whether the monitor's 15-core cable lines or line-of-field synchronous .signal (13 or 14 pin) has a broken line, so that the monitor is not mistaken for a host, sent signals over 4-5 seconds to automatically enter low power-saving state. <br> <br> ② power without the voice .of high-pressure charge, even if you remove the signal line, the power led remains green. This situation typically line scan circuit failure, no pressure. <br> <br> ③ power with high pressure charging of sound, there is no picture .on the screen, remove the signal line, the power led turns orange later, accompanied by high pressure venting of the voice. This is a circuit failure, usually a working voltage of CRT is not added, then you can see, the CRT of filament .is lit. Also possible is the gate voltage is not added. <br> <br> 16. the monitor menu settings cannot be stored <br> <br> After each post needs readjust the settings, the adjustment of the monitor to normal use ., but shut down after data loss. This is the monitor's memory is faulty, you cannot save the current setup information. When the monitor storage circuit failure, there are other strange symptoms, such as image cannot brighten (dark) and cannot be transferred full .screen, partial color, etc. <br>.