Action By Symptom; When The Lcd Screen Does Not Come Out - Samsung MWR-WG00JN Service Manual

Troubleshooting

4-2. Action by symptom

4-2-1. When the LCD screen does not come out

21V GND
5V GND
Start Start
Yes
Is the connection to the Is the connection to the
F3F4 terminal block OK? F3F4 terminal block OK?
Yes
Is the voltage across the Is the voltage across the
F3F4 terminal 9 ~ 12V? F3F4 terminal 9 ~ 12V?
Yes
C108 Is the voltage C108 Is the voltage
between 18 ~ 24V? between 18 ~ 24V?
Yes
C115 Is the voltage between C115 Is the voltage between
both ends 5V? both ends 5V?
Is the LCD connector Is the LCD connector
connected properly? connected properly?
ASSY DISPLAY (LCD) Replacement ASSY DISPLAY (LCD) Replacement
(DB93-16995A) (DB93-16995A)
Yes
Does it work normally Does it work normally
after replacing? after replacing?
End
No
Check the connection between Check the connection between
F3 F4 cable and terminal block F3 F4 cable and terminal block
No
Check indoor power Check indoor power
Replacement of Assy PCB Replacement of Assy PCB
No
(DB92-04639B(JN)/C(KN)/E(UN)) (DB92-04639B(JN)/C(KN)/E(UN))
due to 21V Backlight IC problem due to 21V Backlight IC problem
No
Replace Assy PCB due to 5V DC DC Replace Assy PCB due to 5V DC DC
Converter problem Converter problem
LCD connector reconnect LCD connector reconnect
No
(LCD cable white line / (LCD cable white line /
PCB black line match) PCB black line match)
No
Replacing Assy PCB Replacing Assy PCB
(DB92-04639B(JN)/C(KN)/E(UN)) (DB92-04639B(JN)/C(KN)/E(UN))
4-2