Source Selection - Philips 29PT6441/85 Service Manual

Source Selection

Set is not able to go into AV or any missing AV is encountered
E.g. AV1 is available but not able to enter to AV1: Check if the option setting is correct.
Set is able to go to AV, but no audio is heard.
1. Check that continuity of signal is there from the SCART/Cinch input to the input
of the Hercules.
2. If continuity is there and still no audio, check that option settings are correct.
3. If logic setting is correct and still no audio, proceed to Audio Decoder/Processor
troubleshooting section.
Set is able to go into AV but no video is available:
1. Check continuity from AV input to Hercules depending on the input.
2. If continuity is available and yet no video, proceed to Video Processor
troubleshooting section.
Tuner and IF
No Picture
1. Check that the Option settings are correct.
2. If correct, check that supply voltages are there.
3. If supply voltages are present, check whether picture is present in AV.
4. If picture is present in AV, check with the scope the Tuner IF output signal by
manual storage to a known channel.
5. If IF output is present, Tuner is working fine. If no IF output, I2C data lines may
be open, check continuity of I2C lines. If I2C lines are ok, Tuner may be defect,
replaced Tuner.