Model: DELL 700M
chipset: 82801DBM +855 GME
fault: power is not significant, the standby current of 0.19A is too high, there is short circuit.
Pick on a good price and customers, started working disassemble, visual board, have been found to repair the chip off standby, much better place to move, in line with conservative principles, found a MAX1999 for directly after the power is still the same current too high, measured 3,5 V standby did not come out. No response to the switch, the measured voltage did not come out the other. 1999 found that touch a hot, new chip is not bad ah. Where possible short. Only have 710M of the map will open to study under. First look at MAX1999 working conditions, 20PIN the V +19 V normal, 6PIN the SHDN # often. 3,4 PIN’s ON with 5V normal. 18PIN the LDO5 have 5V, 25PIN the LDO3 only 0.35V is not normal. If problems arose. Check LOD3 of 3D3V_AUX power, but also for the South Bridge, the D25, D26, BC146, to the South Bridge into
chipset: 82801DBM +855 GME
fault: power is not significant, the standby current of 0.19A is too high, there is short circuit.
Pick on a good price and customers, started working disassemble, visual board, have been found to repair the chip off standby, much better place to move, in line with conservative principles, found a MAX1999 for directly after the power is still the same current too high, measured 3,5 V standby did not come out. No response to the switch, the measured voltage did not come out the other. 1999 found that touch a hot, new chip is not bad ah. Where possible short. Only have 710M of the map will open to study under. First look at MAX1999 working conditions, 20PIN the V +19 V normal, 6PIN the SHDN # often. 3,4 PIN’s ON with 5V normal. 18PIN the LDO5 have 5V, 25PIN the LDO3 only 0.35V is not normal. If problems arose. Check LOD3 of 3D3V_AUX power, but also for the South Bridge, the D25, D26, BC146, to the South Bridge into
ICH_VBIAS power
Able to work under South Bridge in standby, the crystal can be started. Now 3D3V_AUX voltage is so low. Southbridge suspected short circuit caused no crystal measured with an oscilloscope waveform, Southbridge did not work. Remove the D25, while 3.3V, while 0. A few volts. Also measured MAX1999, LOD3 have 3D3V, also normal standby 3,5 V out. South Bridge appears to be really hung up, the machine straight for the South Bridge, the welding on the D25. Standby power 0.01, according to boot normally. Roast machine one hour no problem, haha money waiting
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