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Will not turn on - blue standby light is on - Televison & Video

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  • DaveMaple Sep 24, 2009

    Beko NR 21K129

  • DaveMaple Sep 24, 2009

    The television does not have a seperate power board - can you suggest which component may have failed - is it a common failure for this television?

  • DaveMaple Sep 24, 2009

    Very helpful thank you.

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  • Master
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The TV does not turn on, and the light stays on because protection circuit has started.
This is not a common problem, it is a fault state, and can be related to any kind of problem.
The protection circuit is started when a wrong voltage is detected. This can be caused by many different faults.
The first thing to do is leaving the set unplugged for a couple of hours. This will drain power completely and can reset protection if there is no real fault (eg. problems caused by power surge, or temporarily wrong voltage).
If TV is still in standby when you restart, with blue light on, then there is an internal fault.
In that case we take apart the TV and start testing the parts.
The first part being tested is the power board. A power board is an internal PSU unit. When it is external it is called power adapter or DC adapter. The essential difference is that an external DC adapter supplies only one DC voltage line, while the internal power board has lines at different voltages that are going to different boards and parts inside TV.
On power board, first test is a visual inspection, looking for bulged or leaking capacitors, or burnt areas. After that the technician will use a multimeter to read voltages and test components. If there is nothing in there, being this model a CRT, next common faults concern flyback converter. This is an high voltage part, first test is done looking for bad solder joint, and then reading voltages and testing contacts. After that the repairman will check vertical and horizontal aligment circuits. Convergence chips (reading ohms on the resistors at the base of STKs (convergence ICs), etc. If no common fault is found then we grab the service manual and test the chips on digital board and faults that are less common.
Many of this test are dangerous if not performed by a trained repairman. The TV must be left uinplugged for several hours to allow capacitors to discharge before servicing.
That is what must be done.
I think I have told you whatever I could from here. I am a technician specialized on LCD, but I also do CRT. I think I have done what I could from here.
Please do not forget to rate the solution appropriately.
Many thanks.
G.

Posted on Sep 24, 2009

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  • Master
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May i have your TV make and model number to provide assistance , please

Leave it as comment, and we will help you..

Posted on Sep 24, 2009

  • Vinod Kumar
    Vinod Kumar Sep 24, 2009

    HI,



    If standby light is ON in benk, it states that the power board has failed and you need to replace it



    Before confirming it, Perform a power drain once, by the following way:
    Unplug the product's power cable so the device is not grounded to the house, Press and HOLD the product's own power button for 1 minute to drain the capacitors, Plug the product back into a wall outlet and try to turn it on.



    If your TV doent come on after doing power drain, Ur power board is dead.U need a new one to replace it



    Please leave me comment, if you still need furthur assistance



    RNJ VINOD KUMAR

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