Samsung YP-S2 Service Manual page 25

Troubleshooting
4-1-4 LCD Defect
Power On
Does the
3 colors LED turn on but operate
irregularly?
No
Does the 3 color LED
not turn on at all?
No
Does the green not turn on?
No
Does the blue not turn on?
No
Does the red not turn on?
4-12
Yes
Update the firmware
and recheck
Yes
Is the LED element
cold soldered? (LED1)
 Refer to wave pattern
image of Fig. 4-7.
Is the green LED
Yes
TR/resistance cold soldered?
 Refer to wave pattern
image of Fig. 4-7.
Is the blue LED
Yes
TR/resistance cold soldered?
 Refer to wave pattern
image of Fig. 4-7.
Is the red LED
Yes
TR/resistance cold soldered?
 Refer to wave pattern
image of Fig. 4-7.
Replace BOARD
(Requires close inspection)
Yes
No
Yes
(R2, Q2)
No
Yes
(R3, Q3)
No
Yes
(R1, Q1)
No
Add solder to LED and recheck
Add solder to green LED
element and recheck
Add solder to blue LED
element and recheck
Add solder to red LED
element and recheck
Samsung Electronics