Weak current College】 【memory failures, countermeasures and chip desoldering tips.

<br> <br> Memory in the computer hardware is important position in is obvious to us as a computer should grasp Diyer on memory stick the symptoms and solutions or even its chip desoldering tips. Then, by its fault caused by what its manifestations? .here's this problem for a specific elaboration. <br> First, the memory trigger symptoms and solutions <br> 1. power on the system without any display <br> This phenomenon is generally due to memory stick installation problems, such as the installation is .not in place, the memory stick and Memory Stick slot motherboard is bad or even physical deformation without contact. For this problem, reinstall, with drawing rubber surface of the memory of two clean, gold finger for deformation of contact collate after installed on it. .In General, such a failure will be built-in Speaker beep sound, but sometimes not. <br> 2. operating system often produce illegal operation errors <br> This failure is due to a memory chip quality, compatibility, software designing installation causes ., you can replace a memory stick or to reinstall the software a try. <br> 3, often without automatically when you start in safe mode <br> This is because memory stick compatibility, quality is not good, such as 133 of note to .does not support 133 of older motherboard, the solution only attempt to change the relevant option in CMOS (such as data read speed) or replace the memory stick. <br> 4, regardless of what happens in the use of environmental Stochasticity panic <br .> This phenomenon can be sure that the memory of poor quality, compatibility or the same type of different types of memory stick mix. You can modify the CMOS memory speed options, use the same type with the type of memory to improve; also in the .use of similar or the same brand of memory failure is the memory and motherboards incompatible, memory slot is oxidation causes bad; and then there is the replacement of a microcomputer-based switching power supply. <br> 5. start Windows operating system often requires .the registry check repair steps <br> This is largely due to the memory of the use of chip quality is not good, only the replacement of a solution. <br> 6, increase the memory, the system attribute instead of reducing the display performance .<br> Because the memory stick and use motherboard compatibility, generally only replaced. <br> 7, whether it is a DOS system or a Windows system in the implementation of the Himem.sys command have the same address of hint <br> The .cause of the malfunction occurred in absolute is the memory, only physical damage caused by address hint data through projections identifying damaged chip replacement or directly replace the memory problem. <br> 8, run some programs often prompt is not enough memory <br> This .need for separation situation: If your physical memory itself is very small (eg 16M or 32M), this problem occurs, only increase memory beyond reproach; if the physical memory itself is large enough (eg 64M, 128M or above) also receive this prompt ., you may be a system for the remaining space (virtual memory) or is not continuous, can be used to defragment the hard disk troubleshooting methods; there are also small memory when installing the software, the runtime will prompt, if you increase the memory .still does not resolve the problem, uninstall the software and large memory conditions to reinstall once, if I use "penis SE" Edition has encountered. <br> 9, the hard copy when you install the Windows operating system, for the detection of disk .space at the tip of memory <br> Such failures are often due to boot DOS system in the Config.sys file has joined the Emm386.exe command, the command line screen off. Also in this type of installation methods often cause Windows system cannot .find the CD-ROM drive or system properties cannot be set to the optimum state. <br> 10, install the Windows operating system is in the system configuration tips for producing illegal operation <br> The reason is simple - memory stick quality or damaged ., a replacement for system installation. <br> 11, the computer automatically repeat start times <br> This kind of trouble with memory stick related often memory stick quality problems. Also note that the power supply, CPU quality or thermal and thermal stability of .other hardware is working properly. <br> 12, different models of the same speed of memory stick hybrid insertion after reporting capacity is not correct or cannot startup behavior <br> Memory stick compatibility or electrical design, General report identifies capacity of half or even .less. I have a GP32M memory in the kylin M577 motherboard has reported 64M?!, and you cannot access the Windows System. Solution to the problem only two - swap memory, swap the motherboard. <br> 13, the machine boots often fails ., and the upper-left corner of the screen with "Windowsprotecterror" tips and some garbled English means "Windows protection error". This is because different brand, model, speed memory stick mix. Failures solved, swap specifications consistent memory stick can be. .<br> Second, the memory chip removal and welding techniques <br> When we know that a memory stick which chip damage on, might just have the same model of the chip to replace, it involves the issue of IC chip. Today's mainstream SDRAM .chip basically use 54 feet TSOP-II package, the entire chip thickness only about 1.2mm, pin diameter only 0.8mm. So I decided the welding tool is very sharp thin electric iron or private instrument, because the memory chip for CMOS structure, you .must give the welding tool is well grounded, avoid electrostatic damage other memory chips. <br> The following describes how to use sharp, PTC temperature soldering (has to be grounded good) to remove, welding methods and techniques of the chip. <br .> 1. chip removal <br> You need to prepare a high-strength, diameter 0.5mm paintEnvelope (best for gold), along the PIN, chip and PCB's gap between approximately 0.8mm in and out, press the operator easy direction will hold .electric iron hand side of the wire head fixed, then the thin tip try to ping the PIN and PCB solder joints, edge mobile soldering side along its direction of pull line, slender PIN to meekly left PCB solder. Remove finished side, let cool for .a minute and then remove the chip from the other side to avoid temperature through the PCB printed conductors to another chip. If skilled, demolition a chip just 30 ~ 40 seconds then PCB solder joints clean that up, it can be a new chip for welding .work. To sum up: it is important to note that soldering of placing, moving, speed and time. <br> 2, chip welding <br> PCB treatment: <br> First of all the relevant part of the PCB use absolute alcohol .wipe again, cool, dry with Rosin alcohol help welding solution will pad swipe, electric iron will pads tinned; then wiped with alcohol, then brush again help welding solution that will dry spare PCB. Report: rosin flux dispensing of alcohol, used a Rosin .on three ethanol, fully stirring to dissolve uniformly, its concentration can be adjusted, but not too sticky. <br> Memory chip processing: <br> First chip to face up to a thick book (to use its elasticity), use a ruler .to chip for each side of the PIN together down gently press it, and then use the appropriate size of watches gaizhui all deformations of pin arrangement in place, the last dip with xiaomao brush alcohol rosin flux brush PIN again and start the fastest Tin to pin .bright prevail (per foot cannot be more than 3 seconds). Upon completion of all pins can be the final step of welding repair work. <br> IC and PCB welding: <br> Carefully place the chip and the PCB in place, you .must note the direction of the chip-PCB Board all chips in the same direction as the logo you want, otherwise the consequences, Hei Hei ... Remove heavy welding and chip burned. First 1, 27, 28, 54 feet welding fine, .enabling it to be chip fixed, then you can leisurely welding other PIN, welded around the chip after using ethanol wiped dry. Eye hand pain for acid, how to test welding quality? General, just follow the above steps done, basically a successful! .we can gently twist the PCB, carefully listen "CHOW, CHOW" sound, and if so, you can use Magnifier to check and repair welding, until you hear noise (Note: be sure not to twist the excessive or at your own risk) .. <br> At this point, the memory of the basic maintenance work ended and finally to experimental and roast on the machine machine for a longer period of time can be officially used. <br>.