My compaq presario f500 laptop notebook has a north bridge failure how do i fix this without sending it to repair guy and spending the moneyIve done many ways, first by holding down the power button for 10 secs without the battery and the ac charger in it and then plugged in the ac charger but didnt workThen i tried it with battery and still nothing:( what should i do! Its a very old piece of s hit.
Chemical bond: force which combines elements to form new compounds; forming a bond · Always combine positive and negative charges · Usually involves a metal and a nonmetal ex,AlCl3, where Al3 loses 3 electrons to give 1 electron each to 1 atom of Cl (Cl-1-Cl-Cl-1Cl3) Bonding involves a chemical change, which involves different substances being formed with new properties; these changes also involve the release or absorption of energy, light, gas exchange and precipitation production · Always an energy change o Endothermic (absorbs), Exothermic (releases), or both · Ionic - always exothermic Ways to use valence electrons · Transfer of electrons: valence electrons are transferred from on atom’s outer electron shell to another atom’s outer shell o This implies that electrons are gained or lost, forming ions (atoms with a positive or negative charge) o The bond that is formed when electrons are transferred is an ionic bondo Examples of ionic bonds: FeS, NaCl, CaCO3 Why atoms combine are: · To achieve chemical stability · To achieve the same outside electron configuration to that of a noble gas (an octet) o Octet Rule: all atoms want to achieve a full valence shell containing 8 valence electrons Ionic Bond Characteristics · Chemical bond where electrons are transferred from one outer shell to another atom’s outer shell · Electrons are either lost or gained causing the atom to gain a charge How to show electron transfer · Use orbital diagrams of elements involved; electrons transferred are the valence electrons · Use arrows to show transfer · Shows that o Metals are LOSERS: metals always lose their outside electrons forming positive ions o Nonmetals gain electrons and add these to their valence shell forming negative ions · Example 1: 2Na + Cl2 - 2NaCl
What do you mean ? How many electrons used in the covalent bonding or how many unpaired electron left to do coordinate bond ?
a million.a)Ionic - ok ionises an electron and Cl has a extreme 'Electron Affinity'b)Covalent - comparable electronegativity so as that they share electronsc)Polar Covalent- Oxygen has a greater robust electronegativity and so has a bent to tug electrons interior the covalent bond in the direction of itself3 a)Trigonal planarthe three Cl's connect with the Alby way of fact of 'electron pair repulsion concept' the Cl's will push one yet another as some distance aside as accessible, with out bond breakingfor this reason any perspective Cl - Al - Cl is one hundred twenty levelsb) Tetrahedral - The 4 H's connect directly to Si, and lower back will repel one yet another as some distance a accessible giving an perspective H - Si - H of roughly 109.forty seven levelsc)Trigonal bipyramidal - each and each Cl is rapidly bonded to Pthere's a important trigonal airplane have been 3 Cl's repel one yet another via one hundred twenty levelsthe different 2 Cl's enhance orthogonally above and under the airplanegiving and perspective Cl - P - Cl of ninety levels.
I think I told you to do that yesterday? Here's the way you fix the motherboardIf you feel confidenthowever you may break it worseTake out all the screws from the bottomEssentially take out every screw you seeIts typically between 30-100 screwsNow you should be down to just the motherboardDon't let any plastic touch the motherboardYou should see a Fan on top of the CPUAnd likely a copper rod sticking to another piece that looks like another CPUIts the second largest Processor on the computerThats the north bridgeYou now need to use a heat gun that can get up to the point of heating all the solder to a moltent state againIts somewhere between 250-400 degreesThe guns are typically 60+ at leastReally a thermal heat shooting machine is what you needits accurate and also tells the temperatureYou'll also need a thermal gun to check the temperatureHome depot has them for under 40 dollars At this point you should probably have brought it somewhereI really know my stuff and I want to help but this is such a tricky procedureIf you bump it just a little during this procedure it'll allow some of the balls of solder to touch and you'll now have to reball the north bridge (take it offtake all the solder offand add more solderthen reattach it)Which is wicked expensive and time consuming.
