Question about Daewoo DTQ-20U4SC 20" TV

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DAEWOO DTQ-20V8SSFG Shows one Channel only

Unable to program the unit to accept additional channels. The TV shows one channel only. The same channel is seen on all stations from channel 7 upwards. From ch2 to ch6 I get only the raster. It goes through the programming sequence, but at the end only the same channel is seen. I have adjusted those parameters that were out of specification in the service mode adjustments. Still no change. I have tried to add the channels one by one, but no success. Every other aspects of the set appears to be working fine except the auto channeling.
Grateful your assistance.

C Riley

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  • clif7455 Oct 29, 2008

    The advice received is noted, but the unit does not have a separate tuning board, so changing it probably means changing the entire circuit board. Could the loss of some voltage from the power supply contribute to this problem?

    Best Regards
    C Riley

  • clif7455 Oct 29, 2008

    I will accept this solution as it offers another way to tackle the problem. I will comment on it further once the necessary checks are done.



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  • 19,396 Answers

First ensure that you are performing the auto channelling procedure correctly.

If you are sure you have done everything in the proper way, and channel tuning still does not work, than that means that the tuning board inside your TV is faulty, and is not storing channels in memory, therefore should be replaced.

Posted on Oct 29, 2008

  • 1 more comment 
  • Ginko
    Ginko Oct 29, 2008

    A defective power supply can cause the unit to shut down, and cause the tv to turn down, but it is rather unlikey that a fault in the power unit can cause problem with channels storage.

    If this is not a setting problem (ensure you are performing tuning procedure correctly), it is related to the tuner circuit, that stores channel information on an eeprom.

  • Ginko
    Ginko Oct 29, 2008

    On your TV there is no separate tuner board, the tuner is managed by an U102 circuit, however, if channels search is being performed, and channel scanned but not stored, the problem may concern the main 1701 microcomputer circuits, and the eeprom 1703, in which the main computer chip is storing information.

    The eeprom must get 5v power on power pin, or it won't store the information, also SDA and SCL pins should tested.
    The technician will need to test the power to U102 tuner, this should read 5V and 33V, otherwise that is the problem.Also check output to SAW filter on tuner circuit.
    On main CPU you need to check pins to eeprom and to the saw filter, also check the crystal connected to pins 10/11 of the CPU.

    Here is a broad diagram, if you want to do it yourself I suggest ordering the service manual from Daewoo:

  • Ginko
    Ginko Oct 29, 2008

    Here is service manual for a different model, circuits are slightly different , but structure and main components are the same.



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