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I have a 42" Wall Mounted Plasma Screen TV Set have had it Now for aprox 5 Years with No problems at all. However this morning when I turned it on the Picture and sound was OK, and then the Picture Failed without any Warning or any previous Problems, I have the Sound but NO Picture at all. It is a LG and the Model No is MZ-42PZ17 what might this problem be, and how does one get repaired as is it expensive ?? and Could I oder the Part and install myself do you think ??

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  • nobby123 Jul 15, 2008

    Hi Many thanks for your advice on plasma Screen
    loss of Picture. I carried out your advice on the resetting. However on your point 5 Open the on-Screen Menu to Confirm that the TV si responding again (Nothing Happens) No Menu is
    comming up

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Most LCD faults are of two types:
1 Dead (Psu faults)
2 Display Panel Faults

Some have external power units, the ones with a 4pin plug are usually the fault even if they measure +12v coming out, test by substitution
The Psu are Just like any Psu using SMPS(chopper), so use normal PSU fault finding echniques
Start with , Any power from secondary of chopper transformer, at the diodes) usual PSU voltages are 5v,3.3v 12v (the 12v feeds the CCF tubes power generators)
If yes the psu ok, If no check for 320v across mains smoothing capacitor If 320v ok but no output, check for shorts on the output lines (schottly diodes)

Posted on Jul 15, 2008

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  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 15, 2008

    If the PSU is running and there are any leds glowing on the front
    check to see it the flurecent tubes (on each side) are glowing
    they usually have their own supply generators powered by 12v from PSU

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 15, 2008

    2 Display Panel faults

    All faults that are within the panel aren't repairable (Specialist repairs are possible , But the COST)

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jul 15, 2008

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If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:

NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time.
Figure 1: Example of the reset button labeling on the LC2600N
I have a 42" Wall - clip_image001.jpg
1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.

Posted on Jul 15, 2008

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