Question about Televison & Video
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
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:
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
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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Posted on Jan 02, 2017
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