Laptop Model: Lenovo Y500
Fault : Short Circuit
Repair Process:
Generally, the common point is
short-circuited. Then check the drawing and the common point is B+.
Use B+ to follow the
node and find that the short circuit position is PJ6.
In order to narrow down the scope, the N-channel MOSFET of PQ16 was
removed. The test leads still showed a short circuit, so it is obvious that the
five capacitors from PJ6 to PQ16 are the "culprits". Observe with a
microscope to see if there are cracks or blackening.
Sure enough, there were
cracks, and the "real culprit" appeared. The air gun was slightly
heated and deducted, and the value was normal again.
The test run is OK, and
the Repairs are completed.
Happy Repairing !!
No comments:
Post a Comment