Model: HP 511
Failure: the water and being struck by lightningD7 L4 + _ “T” Z1 ^ + l, W
Customer statements: the machine on the window at the rain did not forget the windows, sun dried on its own, and that with a few days! Yesterday was a lightning strike had not boot. Ado, go directly to the question!“Y8 [7 c +] J * I2 i6 h4 _5 a
Open the machine visually see the board has a lot of corrosion, the most serious to calculate EC chip. EC model for the SMSC KBC1070 chip has been the connection pins are corrosion is not clear cut, do not say two words thrown into the ultrasonic cleaner directly to the board cleaning machine, dry cleaning after completing the motherboard. Take a look at some pins to remove the chip wash clean, slowly cleaning up, washing clean scrub brush for a good chip.9 {E0! I)-O% G & S
Not directly after the chip for power, all under the first measurement of inductance there is no short circuit, but measured it was found to prevent low 3V is certainly short-circuited.
Welding under this node, also observed TPS51125G pin corrosion, regardless of the direct replacement of a new up in the 3V to measure the short side has not, but 3V load or short circuit, where the nodes see the figure:
Direct replacement of the South Bridge, after the replacement of the South Bridge can not see the point in the measurement circuit, and has been measured at various points where there is no obvious short-circuit, rest assured power, plus the electric current to jump 0.18 stopped, is certainly where there does not short circuit, they did not touch a hot place, touch the marked U6 chip hot plug:
Removed the waste board to find a press on the standby voltage immediately jump to 0.07 from the 0.18 is no longer hot, and 0.07 in the normal standby does not touch the next thought this machine was struck by lightning, and South Bridge are hung up, see look at the chip card, chip card touched very hot ah! Up immediately dismantled by a standby voltage of 0.01 to normal! A plug adapter will automatically start, because I do BGA remove the battery. I knew it all automatically open question is to see the follow-up. Voltage jump from 0.14 to 0.01 stopped, the voltage should be no CPU voltage, CPU voltage under measurement results go I did not to.* O2 z. `! “E
Check under the timing diagram it!. |8 B/ @. x* {$ b3 r$ S3 t
Fancy figure, the machine must be opened first card for the voltage, then send a video signal on pG CPU voltage, the machine can work!
Key issues have been identified under the TPS51511 to check the chip, measuring 1 foot under a 1.8V output.
This voltage measurement + VDD_CORE no output, no output measurement VGA_PG13 feet. Should determine the chip is broken. Needless to say, to find a direct replacement of the chip. Replaced immediately after power-measurement. Voltage immediately jumped up. Finally returning to the HP screen came out. . . .
See no problem. Directly mounted machine tests did not find any problems, tested one hour. Customer calls that fix it? Let him look more anxious to take the machine. He is less than an hour to get back on and back, this machine also has the problem, said plug adapter will automatically start, and he installed directly under the system automatically shut down half as long as the installation, I thought hot graphics caused. Check immediately disassemble the machine! Under test is causing the shutdown temperature is hot. The result is not under temperature test to see how high the temperature, carefully check it!& Z), C3, p # z & f0 b. S $ v3 W
This machine is lightning, I used to repair to this machine, will not be a bad network card detection MOS pipe, ah. This common problem, but HP’s it, basically as long as the chip will be broken by lightning, and faults are shown; a plug adapter is automatically turned on, but battery power is normal. Regardless of the tubes under the first measure is good or bad. See below:5 s. q” T9 W” e1 B- x
| Is the tube, this tube really test the next bad, on the replacement of a MOS. After testing the replacement does not automatically boot up the machine. Auto power off problems are solved. Installed test machine for several hours without any problems, call the client machine has been repaired. . . Pick-up. . . . Summary: a machine like this, when a check carefully, especially the water machine. Most important is to look at the customer’s statements and see how bad the sort ideas to repair! Little experience want to help novice! Friends want to read the top of the next post, let the novice to see more helpful. My attitude is to help more friends, anyone to Rose, a shop unless. . . . . . . Follow-up. . . .) B7 L: T4 O / j /] |
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