In my notebook, 64-bit win7 will go down.

Dell vostro 1200 repair case-after-sales repair of Zhengzhou DELL notebook
2010 Zhengzhou Dell laptop repair after-sales service center is connected to a Dell vostro 1200 motherboard. The secondary repair board fault is that the boot board indicator light is on, and the current jumps to 0.16a south bridge for ironing, after the power failure, the inductance resistance of the entire board was tested. It was found that the pl16 was short-circuited to the ground. The Board was originally located in the south bridge, and the memory slot was also soldered. Repair method is very second-rate, welders do not pass, electric pl16 South Bridge is hot, on the BGA to remove the South Bridge, test pl16 to the ground resistance is normal, for a new HBM South Bridge, after power-on, the current stops at 0 and 26a. After careful inspection, we found the r242 shift on the board. After the power-on fault is corrected, the inductance voltage of the entire board is measured again, and the pl16 voltage is abnormal, only 0.77 V
. Obviously this is not normal, there is no drawing in the hand, so I directly changed a control chip tps12724. Vostro 1200 motherboard failure still
It seems to be slowly tested, in the knowledge base to find a LA-3821P drawings, repair began,
Dellvostro 1200 Power Supply chip 51124 test 51124 feedback pin vfb1, observed carefully found that due to the phenomenon that someone else welded the memory slot near the original shift, pr66 pr65 there are traces of welding, directly test the resistance of 2 resistors. pr66 is 0 euro. The problem is found. pr66 is supposed to be a resistance of KB, Which is stolen into a resistance of 0 ohm. Power-on Troubleshooting after replacement.
Installation test: the interfaces of the Dell vostro 1200 laptop are normal. After running 3 dmarks for 24 hours, there will be no crashes, black screens, flower screens, and other undesirable phenomena. The installation is delivered to the customer and the repair is complete.