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Re: dead mother board
The problem with power surges, or low power (brownouts) causing excessive current draw can cause multiple problems to motherboards. Even if you were to pinpoint and repair one problem that appeared to fix the fault, several other components on the board may have been weakened, and prone to fail.
If you are certain that the power supply is 100% ok, then replace the MB.
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You must have meant MOTHER BOARD . but if there is no display then it is possible that the main powerr supply hasa failed. So check this SMPS unit before you can think that the mother board/display panel is faulty ONLY if there is correct voltage supply to the board.
I would first double-check the "known good" power supply. If there is something bad wrong with the MB, it could have blown the fuse in the power supply. I have seen very few fuses on motherboards, they are normally in the power supply. If the power supply checks out OK, then double check the connectors between the power supply and the MB.
ELECTRIC SHOK OR IMPROPER EARTHING IS DAMAGE POWER SUPPLY,MOTHERBOARD,PROCESSOR,RAM
HOW TO CHECK IT.
(WHEN CHECKING KEEP CAUTION :- REMOVE HARD DISK DRIVE POWER SUPPLY SOCKET)
1. check power supply watt 400/450 and same another power supply install and check it. if power supply change and system is working ok so problem in your power supply.
2. check CMOS cell on motherboard,(3 volt)
3. Bfore power supply changing check on mother board any capasitor is like as damaged or not.
OR check main chipset ic is marked as intel.whenpower on it is very hitting or
normal)if very hitting require to repair your motherboard.(intel chipset ic near cmos cell or pci slot,)
4. checking of ram on other pc (working or not)(one beeps coming or not,if one beep coming ram is working ok)
Does the device do anything? Is it completely dead? If it is, then there is a good chance the power supplies have failed. Power supplies use electrical devices called "capacitors" to filter out voltage variations which are created during the process of converting alternating current to direct current. If the capacitors have shorted out, they should have caused a fuse to blow.
The manual you need will be on the board manufacturers web page, howevr I will bet you have the case power switch and perhaps the reset switch on the wrong pins on the mother board. To check this, remove the switch leads from the mother board, then use a small screw driver and bridge the pins on the mother board a pair at a time. All of these leads plug on to the board in a line and not across the two lines of pins. when you get the mother board to fire up by this method geet a torch and look closely alongside the pins you will see the letters PWR SW or RS SW. It does not matter what polarity these two sets of leads are plugged onto both will work. The LED lights on the case front will only work if the polarity is correct but it will not do any harm if they are backwords. On the board you should se two sets of pins marked HDD and PWR these are the led light pins you will know you have them right when the usual red and green lights are working at the front of your tower.