Action By Symptom; When The Lcd Screen Does Not Come Out - Samsung MWR-WW10N Service Manual

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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
(DB92-04639A) due to 21V
(DB92-04639A) due to 21V
Backlight IC problem
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
(DB92-04639A)
(DB92-04639A)
4-2

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