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UNKNOWN SM142
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of UNKNOWN SM142 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 16 (click to view)
PICTURE AND COLOUR DEFECTS

No picture Raster OK

Check video out signal at pin 38 of IC101

NO

Check the tuner pin voltages. Check the voltage 3.6-4.6 V at pin 18, 19 of IC101. Check and replace F101, IC101.

YES

Only white raster visible on screen

YES

Check CVBS signal with an oscilloscope. The video signal goes through R103, T104, R154, F104, T105, C150 to pin 40 of IC101

NO

There are flyback lines on the screen

YES

Check Hor. Flyback signal at pin 31 of IC101. Check and replace C129 which is connected to pin 11 of IC101.

NO

There are black drops on the screen.

YES

Check and replace C139

NO

No picture. There is a Red, Green or Blue raster on the screen

NO

Check and replace R167, R206, R118, R136, R137, R135, IC101.

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