Samsung YP-U5 Service Manual page 28

4-1-8 Poor PC Connection
Faulty connection to PC
Is the MP3 player
recognized when it is directly connected
to the PC USB port?
No
Is a recovery
update possible?
No
1
When the MP3 player is
connected to the USB port, is the
voltage on IC7 Pin 5
approx. 5V?
Yes
Are R18 and R19 cold soldered?
No
2
Is D3 element Pin 1 or Pin 2
short-circuited to GND?
No
Replace the board
(Detailed inspection is required.)
Samsung Electronics
Yes
Yes
No
 Refer to wave pattern
image of Fig. 4-5.
Yes
Yes
 Refer to wave pattern
image of Fig. 4-6.
Complete
(Faulty user hub or faulty
extension wire)
Execute recovery update and then
check it again.
Check if C24,
C25, C36 or C40 are
short-circuited during the GND
short-circuit test.
No
Replace the faulty elements or re-
solder and then check again.
Replace D1, D2 and D3 (remove
them if they are not replaced), and
then check again.
Troubleshooting
Replace the faulty elements and
then check it again.
Yes
Replace IC7 and check the voltage
again.
4-15