living light, coupled with recently addicted to online games, are the eight children of long time did not repair the machine, the past few days received a DV2000 Machine Head , but after two days of efforts to finally fix the machine model DV2403TX as a typical graphics card door machine North Bridge 945PM Graphics 7200 customers sent is sometimes point does not shine, sometimes light can also use a normal / w B ( |; O # U. j2 y. o “@ Then boot test, for the first time did not light up, the second light testing one hour, in order to exclude the graphics card failure with 3DMAKE pagers, computer display normal, do not see a little, put the first two days of a night boot test is still able to load * s4 x * z- T; A8 o-] 3 A & E because I have indeed seen failure, so in order to allow fault decided to disassemble the test, then the tragedy began to machine Chai Wan, does not shine directly point to the current to 0.8A blocking, not any transition r-; d * a3, b: b; – the COMS discharge, replace the memory, replacing CPU test results, check the appearance of the motherboard to see the graphics card before welding, and the fan was turned into a long turn, other places they have taken. 6 i-z0 B: V! T ‘q) a repair in accordance with previous do not run the code experience, this type of machine is not running code, is likely to be the South Bridge – a! the K8 @ S% E; w4,] 0 [3 Y with an oscilloscope and played under the South Bridge, 32.768 crystal hit the straight line of the two voltage played this motherboard, playing less than a normal waveform, waveform flash just in the beginning, and then into two straight lines. The feel of Southbridge crystal is normal. Have to start from scratch, with an oscilloscope hit the BIOS, a foot and 16 foot
NND next difficult to repair this machine seems to slowly check the CPU and memory lampholders test, the lights came also normal $ e9 N! a $ c) T / {5 v) E. Y with a fake load to test the CPU to the Northbridge memory to the Northbridge value, the normal CPU power supply, reset, voltage reference, clock and so everything is normal, the memory power supply, the reference voltage, SPD-Voltage Clock, system bus anyway, can be measured are measured, normal thought since the CPU and memory is no problem, then is not the graphics a local short-circuit the Northbridge does not run the code? so graphics under, power transition, current 0.8 stopped without any response -?, b0 _ (of i2 S + e “a3? 3 o)% IK e4 U9 v The next head no ideas, is this the machine like this? got up this morning, did not do the other invited half a day off at home eating a morning of 5 l *?, W4, b8 o;] ‘P insufficient good complement to fill 3 W4, O: A Lile of L0 @ 1 W-F7 on e3 p # M # j After reading the information to their own ideas ; i # `5} 1 m9 V- computer starts, it will follow the power-on timing, the output from various quarters voltage, only in various each device reset the clock to meet after the normal circuit voltage, CPU only through the FSB to the Northbridge by DMI to the southbridge through the LPC bus to the EC, then the X-BUS to the BIOS, only CPU reads the BIOS will initialize device memory in the CPU to the BIOS is playing less than exclusion waveform of the machine, Northbridge, Southbridge, to replaced, the CPU can also be changed, memory and video cards there is no short circuit result in Northbridge job. ADS # for switching machine to play again to play a sometimes waveform, and sometimes do not see the waveform, sometimes continued waveform, a bit puzzled. Find a piece of plate to find the DMI bus in Northbridge to Southbridge DMI_RXN0
when you plug in two memory without, or after replacing the CPU does not show the P (h-~ 9 A! f-y “{0 R
sometimes reseat the CPU, it seems that this is the first fail
ure * m S9 the U7 R4, Q1 is the G
washer water to wash the CPU socket, not dry in the washer water insert CPU locking transition $ D0 M ‘S $ u l * p
washer water evaporates again to replace the CPU power without transition, to determine the CPU is good it seems failure is very clear, is the seat child contact does not shine a result of the CPU does not run code [8 O * R / Y / b plus welding the CPU socket, re-test failure is not the emergence of this machine repair supplementary content (2012-5-9 06:42): 6 ^ / A% n2 H-u $ g5 z “R + U0 v6 G reply to those who felt this machine repair custody have, first of all, this machine with dummy load, and CPU lampholders test is normal, followed by unlike desktop by hand pressure as the heat sink will be able to run code, if it is as good repair, followed by your light eyes and look at welding the CPU socket before I pulled down what D; U # C1, to 5 of f8 ` D & Y $ K complement (2012-5-9 06:43): . v9 P & z-R + d; k0 ^ trouble you with bulging look, would like to see in reply to * F; T6, ^ 9 U ‘p2 c4 N) J # h supplementary content (2012-5-9 6:45): 5 u; F * m + o)] / q machine consists of two failures, the first is a PCI device to cause the machine does not run code, after the demolition of point normal run code, the second meeting electricity sometimes do not run the code, sometimes indeed run the code, is caused by the CPU socket, only repaired the first fault in order to repair the two fault