Roadstar DVD-5105, Service Manual

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- Use a universal wattmeter or an oscillator to test for 5V between Main Board J13 Pin 2,
3 and GND, if not, test if RX7 produces 5V, if so, go to the next step.
- Use an oscillator to test if Y2 creates 27MHz, if not, check C58 and C59 to see if its to
be 22P. Eliminate missing and cold welding. If X301 is NG, replace it.
- Check if U10 is in poor contact or F/W IC with problem.
- If none of the above steps works, replace MAIN BOARD.
2. DVD ROM (rare)
- If it does not work by replacing Main Board, replace DVD ROM.
T21 Video 1 No image/abnormal
1. Main Board
- Remove the top cover and check if the Flat Cables connected to the inside of the
device are properly plugged in the right position, or plug them correctly.
- Check J13 of Pin 2 for missing and cold welding, if yes, remove them.
- Check post CVBS RLC for missing welding or cold welding, wrong parts, short circuit
or interruption, if any, eliminate it.
- If none of the above steps works, check U15 for missing and cold welding, if any,
eliminate it.
- If none of the above steps works, replace MAIN BOARD.
T22 Video 2 No image/abnormal
2. Main Board
- Remove the top cover and check if the Flat Cables connected to the inside of the
device are properly plugged in the right position, or plug them correctly.
- Check J13 of Pin 2 for missing and cold welding, if yes, remove them.
- Check post CVBS 1 RLC for missing welding or cold welding, wrong parts, short
circuit or interruption, if any, eliminate it.
- If none of the above steps works, check U15 for missing and cold welding, if any,
eliminate it.
- If none of the above steps works, replace MAIN BOARD.
T23 S-Video No image/abnormal or B/W
1. Main Board
- Check post Y_OUT and C_OUT RLC for missing welding or cold welding, wrong
parts, short circuit or interruption, if any, remove it.
- If none of the above steps works, check U15 for missing and cold welding, if any,
eliminate it.
- If none of the above steps works, replace MAIN BOARD.
T24 VCD display abnormal