Faults And Corrective Actions - Samsung 400UX-2 Service Manual

4. Troubleshooting

4-9. Faults and Corrective Actions

Category
Model: 400PXn Beethoven 2
CPU Socket problem
- Symptoms: Various defects found in marketed products
- Causes: Poor contact occurred between the CPU and the CPU
Defect
correction
1) Structural problem in the CPU socket
history
2) Strain due to the gap pad's thickness between the CPU heat
sink and the instrument's shield cover.
- Actions taken:
1) Requested Foxconn, CPU socket manufacturer, to change
the shape of the socket's contact area: to lengthen the pin's
contact or to reshape the contact area into a hook shape.
2) The PBA line performed shock tests during a performance
test on the network board to sort out defective sockets
3) Changed the gap pad's thickness (from 3.2mm to 2.0mm)
Model: 400PXn Beethoven 2
Problems: Defects in Samhwa's 16V 100uF Caps and field
Symptoms: Sound noise when opening Caps
Actions taken: Took temporary measures
- Samhwa in Tianjin discontinued manufacturing 100uF/16V,
which was supplied by Samhwa in Korea instead. (Jan. 30)
Defect
- after an alternative was set up, manufacturing was carried
correction
out to successfully cover the production volume, which was
history
originally to be supplied by Tianjin, in December before Jan. 30
- Performed a comparative analysis of 100uF/16V M-Type (105
degree, 3000 hour) between Korea and Tianjin Samhwa
- Performed a comparative analysis of Tianjin's production
volume between July ~ Aug. and Dec. (Jan. 29)
- Established a dualization schedule - development evaluation
(Jan. 25)
- Set up alternative measures and notified results (parts
warranty) (notified later)
4-16
Defect symptoms and Actions taken
- Windows boot-up failure, Windows freeze-up,
Windows restart, Blue screen, Windows error
message, etc.
socket due to the CPU socket's structural problem
and strain.
defects in Japan for the Beethoven 2 model
(Japan, Dec. '07)/ BNC screen noise when opening
TSED PBA Caps (Jan. '08)
Remarks