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Motherboard Troubleshooting







maintenance program: pin this phenomenon, according to the live experience, doubt can store enough power, the clock frequency is not, bad filter capacitor, motherboard, etc., causing cold solder joint.
process of elimination: In accordance with maintenance programs mentioned, the first measurement of deposit supply, 3.3V constant, the frequency measurement stored around the clock 44MHZ, million meter to measure the voltage of 0.9V, suspect a problem with the clock chip power supply, power supply was measured to 3.3 V often (this board does not supply 2.5V), then check deposit linked to exclusion of 22 ohms between the clock and its resistance is constant. Diode chip capacitors range measuring its connected, its only 6 ohms resistance at both ends, the clock chip has slightly hot, replace the capacitor, troubleshooting. Memory clock recovery 100MHZ, voltage 1.5V.


process of elimination: According to this is like, first check the power supply circuit board, in particular, the main CPU power, its range of 1.75V is often, and then test the memory and the motherboard chipset supply, there is no infrequent phenomenon . Frequency measurement points of the clock frequency,[link widoczny dla zalogowanych], without any problems. can reset some fault, measure reset switch is only 0.45V, was rarely to be 3.3V. This voltage is equivalent to short the reset button, reset until all lit.
to find along this rail link, connecting a 472 resistor, head into the 14 circuits, and the other connecting the first red line through the 472 resistance.
first determine whether good or bad gate, gate replacement, fault resistance is still .472 Another head 5V often, but that only 0.45V, the actual maintenance when such a bad little resistance, there can pull something, check carefully that the lines connecting the other lines also extremely transistor C, E grounded, B most 1.2V, . fault has been determined by the tube pulled. and then look down the pole B of this transistor, the transistor CPU Block B next to the pole and connected a transistor E pole. E very C by measuring the very breakdown, resulting in surface tension transistor through the reset button. troubleshooting replace this transistor.
Comments: Maintenance failure when the case of this, it is best to run the circuit side edge drawing, it is a good analysis of the problem. Buzhi Yu race side forgotten side.


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