Samsung DMR78 Series Service Manual page 51

Error type Error mode
Display error None
Key input part error None
4-13
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Checking Method
2-3. Check the display LED. (the front display of
DMR57)
- Check the number of the part that operates
abnormally. Check the LED on that abnormal
point by inputting 5V to the S part through a
300Ω resistor and grounding the D part.
Nomral: The point lights up normally
➢
Ex) If the D1-a point operates abnormally,
check the connections between pin 1 of the 7-
pin connector and pin 1 of the 6-pin connector.
(See the figure on the right.)
3. Check the DC voltage of the Main PBA.
1. Check Power Key on state.
2. Check the connections for the Sub PBA connector
part.
3. Check the DC voltage of the Main PBA.
Corrective actions
- Faulty: Replace the Display LED.
1 2 3 4 5
a
6
f b
D 1 D 2 D 3
7 g 9
10
e c
8 d 11
- See the "Main PBA DC voltage error".
- Try to turn on the Power Key.
- Reconnect the Sub PBA connectors..
- See "Main PBA DC voltage error".
4. Troubleshooting