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Rank Arena 32" LCD TV Repair TL3291

Discussion in 'Troubleshooting and Repair' started by grasshopper, Mar 24, 2013.

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  1. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    Hi All,
    The project is a model TL3291.
    The red LED light comes on on power up / standby mode but when the TV on button is pressed nothing happens.
    I have confirmed mains voltage to the power supply board and checked the power supply fuse on the board which appears sound.
    Visually I have lookes at both boards for any signs of swollen or damaged electrolitic capacitors but can see no obvious damage.
    The TV is about 4 years old but has had little use.
    What is the next stage of diagnosis please?
    Is it checking all the electrolitic capacitors on both boards wih an ESR tester?
    Checking voltages where marked on the boards?
    Some other approach?
    Any advice and wisdom would be greatly appreciated please?
    Thanks
    grasshopper:confused:
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
    2,837
    Jan 21, 2010
    Do you have a service manual for this set?
     
  3. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    Schematic

    Hi Steve,

    I have only managed to source a schematic so far which I have attached. I have yet to confirm this matches the board I have.

    Thanks
    Grasshopper
     

    Attached Files:

  4. sheldonstv

    sheldonstv

    68
    0
    Jul 17, 2007
    what you need to do is check the supply is giving you the correct dc voltages -as its an lcd start by pulling the lead to the inverter board and see if the set powers up with sound but no picture-at this point you can also check the 24v supply is present for the inverter too-another possibility may be that the inverter is ok but you have a fault with your ssb panel ....post pics of your set if you can
     
  5. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    board photos 1

    Board photos
     

    Attached Files:

  6. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    Board Photos 2

    Photos 2
     

    Attached Files:

  7. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    Hi Sheldon,
    Board photos as requested.
    Kind regards
    grasshopper
     
  8. sheldonstv

    sheldonstv

    68
    0
    Jul 17, 2007
    yes i know this set have had a few of these im looking for the manual,this set also turns up as a badged bush set or hitachi .....do you not have any voltage to the inverter board at all-24 v not present?no standby supplies present?are the voltages not marked by each socket on that board? if i remember rightly there was a psu repair kit available for one of the bush models
     
  9. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    G'day Sheldon,
    On the Power supply board there are voltages and grounds marked beside the connector. I have measured these and will post the results later tonight.
    I have not measured the Inverter board supply and I am not sure which connector it is as yet? I think the connector shown top left in photo 2236 (two white and one black cable) has Inverter etched on the board beside it and I will check that out as soon as I can , probably tomorrow night and post the results here.
    Many thanks
    Kind regards
    Grasshopper
     
  10. grasshopper

    grasshopper

    26
    0
    Mar 24, 2013
    Voltages Measured

    Hi Sheldon,

    Below are the voltages measured with the power on and the red standby LED illuminated:

    Cable Colour Voltage Etched on Board Voltage Measured
    White 12V 0.9mV
    White 12V 1.0mV
    Not used Gnd
    Black Gnd
    Not used Gnd
    Not used +5V
    White +5V
    White +5V SB 5.16V
    White PS-ON 3.63V
    Not used +5V
    White +5V 0.69V
    Black Gnd
    Black Gnd

    This is the connector located top right in photo 2336 of the power supply board.
    I am not sure what the voltages measred so far tell me as the circuits are not loaded?
    any wisdom would be appreciated.

    grasshopper :confused:
     
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