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