Samsung DMR57 Series, Service Manual

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4. Troubleshooting
4-13
Error type Error mode Checking Method Corrective actions
Display error None
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.)
- Faulty: Replace the Display LED.
1 2 3 4 5
6
7
8
D 1 D 2 D 3
9
10
11
a
b
c
d
e
f
g
3. Check the DC voltage of the Main PBA. - See the “Main PBA DC voltage error”.
Key input part error None
1. Check Power Key on state. - Try to turn on the Power Key.
2. Check the connections for the Sub PBA connector
part.
- Reconnect the Sub PBA connectors..
3. Check the DC voltage of the Main PBA. - See “Main PBA DC voltage error”.