SOURCE: TV quits working, screen goes black and red light next to power green light flashes 4 quick flashes.
The Sony diagnostic routine for 4 blinks indicates it to be a vertical deflection problem.
Did you see a solid horizontal line in the center of the screen prior to it going out? If so, that is a tell tale sign for vertical problems.
basic sony reset below
The STANDBY light will flash if the television detects an issue within the television. Some of these issues can be resolved simply by following the steps below to reset the television.
If the issue is still unresolved after following all of the troubleshooting steps, service may be required. Please note the number of times the STANDBY light flashes and relay that information to the service center
SOURCE: LG 47LC7DF LCD TV problem:
powersupply going into shutdown to fix 1problem coldsolderjoint likely culprit fix go over solder jointc in powr supply mod first then hv circut pwe mod should come allway out tv reinstall should fix problem if not exp in elect just goto lg web site order new pwersupply should cost 60 115 bucks tip pts electronics.com save u money good luck shan
SOURCE: I have a Sharp lc-42d62u
Hi.
I do not think that a firmware or software update (if available) will make any difference. If the backlight starts and turns off, then it is either inverter, PSU or circuit controlling inverter (located on main controller board). The fact that you replaced the boards does not necessarily mean that everything is OK with newly replaced boards. I repair LCD TVs and I can tell you that the board swapping method is not effective or good with this kind of electronic. This is not a PC, if you replace all boards without testing, then you may get in more troubles than when you had the initial problem.
The T-con board is regulating the timing of signal to LCD. The T-Con board symptoms are in effect no picture and sound still going, but often the backlight does not go completely off, you usually get a faint flickering backlight. Before replacing the T-con, testing should be done reading voltage in the DC line that goes from PSU to inverter. If there is no DC voltage, then the problem is not the TCon. If there is DC voltage in to the inverter, but no high voltage out from the inverter, then the inverter is usually shot. For safety reasons testing with live power should be done by a trained person.
The other way to proceed is swapping TCon board. In this way there is also the chance that LCD panel failed, that is usually beyond repair.
Regards.
Ginko.
SOURCE: 42" lg lcd tv pitcher flickers then gos black
Since the audio is still working, the main power supply probably
wasn't at fault and you may be looking at more research and
possibly
more expense.
The problem is very likely on the largest board or with a failing
circuit that is part of the display.
You may be able to isolate it by using 'freeze spray' which you can
buy anywhere electronic parts are sold.
I suggest more than one can of it; ~ $7-8/can.
You will need to have the guts exposed and the set turned on.
Look around the edge of the display itself for chips (ICs) and give
any you see one brief shot of the spray, wait for ~1 minute for it
to
'soak' and then move on to the next one.
If the video comes back, even if only briefly, repeat the cool-down
until you are confident to have found the right one.
If you can isolate it, you still have a problem.
If the sick IC appears to be 'glued' (with solder) onto instead of
through the board, you may not be able to replace it successfully.
If you can see that it has pins going through the board, these can
be
replaced by anyone with a professional soldering tool and a steady
hand.
Remember, the problem can be on a board that is only connected to
the
display panel but if on the panel itself, you may not be able to buy
a
replacement for less money than a new set would cost.
SOURCE: Samsung TV goes Black but keeps sound
you will need to check weather the 24vdc supply for the inverter board is good no drop voltage. if no supply check the power supply board. then you should check if their is a inv_on signal at the power inverter board around 3v-4.4vdc . if goes out during power on tried to disconnect the supply going to the inverter board to ensure if their is a shorted parts in the inverter board. if the inverter_on signal also goes out even with out inverter board connected that was mean you have problem in the processor board.
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