Question about Insignia IS-LCDTV32 32 in. Television

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I have a insignia is-lcdtv32 when you plug it in the front light is red, then when you turn it on it just blinks red constantly and it does not reconize the on/off button anymore it just keeps blinking red. Also no picture or sound. I did look at the capacitors on the power supply and they did not look bad

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  • jimcweaver Oct 03, 2009

    Okay the problem is internal, I have a good mutlimeter to check the psu if you could tell me where to check the dc voltages outputs. The back of the psu showed +24, +22, +12, and +5 are these voltages fused?

  • jimcweaver Oct 03, 2009

    Mr Ginko,

    Are you able to tell me where to find the +24, +22, +12, and +5 output voltages on the power supply?

    I have a good multimeter and know how to use it, I was a hardware tech for 23 years at NCR.



    Thanks - Jim

  • jimcweaver Oct 03, 2009

    Mr. Ginko,

    Sorry for the last email I just saw the rest of your comments



    Jim

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  • Insignia Master
  • 19,396 Answers

Hi,
When the light is red on off position, and blinking on on position, that means that the TV is in protect mode.
Protect mode is a diagnostic mode that kicks in when a wrong voltage is detected. It can be caused by an internal fault or an external event like a power surge. The protection circuit will start, preventing the TV from turning on and keeping it in stand by, with the led blinking and no raster when TV is on.
If the problem is external, like a power surge, or a short on antenna or receiver connector contacts, for example, the problem is fixed simply leaving the power cord disconnected for one or two hours. On LCD even less, since LCD TVs do not have high voltage circuits, either than the inverter, 15 or twenty minutes are usually enough to drain power completely and reset the protection circuit when there is no internal fault.
If the TV does not reset, then there is an internal fault.
In that case testing will start from PSU, where after a a general observation, as you have already done, the technician will read voltages out using a multimeter. While checking the PSU, it is also worth giving a general look to see if everything is OK, checking connectors, ribbon cables etc. IF PSU is OK, next part to test is the inverter. A first test on the inverter is done reading DC voltages in, and reading high voltage out (with multimeter on AC). A complete test can be done only using an oscilloscope to test the AC section of the inverter circuit. If inverter is ok, the I/O connectors and touch buttons are tested. This is a simple test, using multimeter to check that there is no short on I/O ports, and that no button switch is stuck on close. If still nothing , what remains is the digital control board, that is the main board inside the TV. This is more complicate to test, and for this purpose usually service manual is used. Service manuals for this Insignia had never been distributed, therefore the only options are testing at component level, or replacing main board and taking a risk. Test and repairs must be done by an experienced person aware of the safety risk involved.
Regards.

Posted on Oct 03, 2009

  • Ginko
    Ginko Oct 03, 2009

    As I told you the schematics for this model are not available, therefore I will give you general indications that are valid for most LCD.
    As usual, I'll remind that if you decide to DIY you must be aware of the safety risk involved, and you must have technical training.

    There are resistors on each output that may will blow in case of over voltage. They must be tested checking continuity.
    On many LCD, when TV is in standby, only the +5V circuit is on, sometimes on of the other voltages. The higher voltages, like the +24 to main board toward inverter connector will be shut down.I must add that if there is no power on one of the PSU output, the PSU is not neccessarily faulty. The PSU is often controlled by the main board, that can turn on and off voltages.
    On standby there is usually +5V , if there is no 5V, PSU is faulty.
    Testing the PSU in full on an LCD is more complicate. To test other voltages you may need to jump wire the +5V line with the contact that activates the +22 and +24. That can be done only if you have schematics, or if you have enough experience.
    In your case, before testing PSU at component level, test the inverter.
    Rad DC in and AC out. If there is no DC on main board go back to PSU and test component near to +24V. AC out from LCD inverter may reach over 1KV , be aware of the high voltage.
    The alternative is testing at component level.
    Often the problem is a faulty inverter, or a blown component on PSU , and can be spotted easily, sometimes you may need schematics to be sure of the problem, but if you do not have schematics and you do not find anything else, you usually replace controller board.


    Regards.

  • Ginko
    Ginko Oct 03, 2009

    Hi,


    No problem. if I find schematics or any technical document for insignia I will post here. Apparently they do not distribute service manual.


    In case I will let you know.


    Bye.

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