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BGA maintenance experience
1.Judge BGA chip damage caused by power supply circuit:
5V, 3.3V, 3VSB, 1.8V power supply and GND short circuit, the general situation of the size of BGA have been
damaged, the 810W series and the 815 series of the main board is the most common.
1.8V, 3VSB power supply and GND short circuit, the general situation is small BGA chip damage, with more
than 810W series motherboard.
3.6V power supply and GND short circuit, the BX series is generally the most common.
P1, p2i series motherboards, if the VDDQ (1.5V) power to GND short circuits completely big BGA chip is
damaged, and if at the same time vid core voltage and GND short circuits completely. At this point it should
be attention to MOS tube is burnt out.
P4 series repair motherboard, 1.8V power supply to the GND completely short circuit, in general, is a large
BGA chip damage.
About P4, P1, P2 series motherboard repair fault without power, should check the power supply on the 1.8VSB
resistance pit about is getting smaller.
2.Cause analysis of BGA damage in power supply case:
P4, P1, P2 series motherboard, there are many big BGA chip blind before have not ruled out the mainboard
power fault causes damage to the motherboard power is more, at this time should be paid attention to in turn
on the juice before the main board of the MOS tube, if discover the MOS tube grid over the ground resistance
Keng Keng has become smaller or 12 v power supply to ground resistance is smaller. Should first after
troubleshooting to electrify, generally can avoid damage of BGA chip, eliminate the above situation, of course,
there are exceptions, in the above two normal conditions, there will be much damage of BGA chip, this basically
is DC_DC power management PMW conversion chip damage, and the proportion of the 12 v voltage stabilizing
circuit has a problem, everyone in the maintenance should be treated separately.
With a rubber hammer on the motherboard BGA chip to BGA fault diagnosis method:
Don't try to play the big plate C1 BGA significantly higher success rate of BX, AX, series; low success rate is
815, WX, P, series.
00 doesn't try to play big BGA success rate higher board type only P series; Don't try other plate type.
TAG:  BGA maintenance experience BGA chip