I had a similar problem where the TV would turn on then shutoff when bumped or over time. The clue was a "tick" sound when it shutoff. Unplugging and reconnecting the power cord go it going again for a few minutes anyway.
I took the unit apart and found the solder connection on the power supply unit was cracked where the main transformer attaches. The solder connection joins the PC board. I suspect the weight causes the joint to stress crack. This is easy to fix by removing the power supply and touching up the solder connections around the transformer. I'd check this first as it is very difficult to locate power supplies and other parts.
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HI, By three blink it means the B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is because there is problem in the power supply circuit. Check for any dry soldering in the power supply side. If the tv is working properly for 20 minutes then its sure that there is some dry soldering joints in the power supply side. You have to resolder suspected soldering contacts using soldering ion and solder. The dry soldering joints will look like on in the picture.
your TV is having a power problem. The power supply board is defective that's why the TV won't power up. Its receiving power but it cannot transfer the current to the necessary part of the TV because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the TV might not come on.
If you know about TV repairers, I would suggest that you open the TV and read the power board/panel with a meter, detect the bad component and replace it. Take note that TV stores a lot of current that can shock, so leave the TV for a while before you open it.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you.
Now, the cost of repairs will determine whether or not you should purchase a new unit. If the cost of repairs is very expensive, then it would be better you go for a new unit.
Hi I am vortash .. there is a modification kit available for this tv and available from ebay priced about $50 0r £30 depending on your location . It is the start up driver circuit that needs these components on the power supply if you are competant to attempt this .However if not then I suggest that you take it to a local enginner for a free estimate he will at least be able to tell you the fault . regards Vortash
that your unit has some sort ofPSU
fault, or a problem that is shutting down the Power Supply Unit, PSU. This
happens so that no further damage, and possible fire will occur. You need to take the unit to a reputable service centre/man
and ask for a firm "Quote" for the work to be done. It is that re-starting that gives it away, this is a typical
switchmode Power Supply problem.
This problem is likely a failed power supply. This is a known issue
with this model TV. It will normally occur soon after the warrenty
expires. It can also be caused by a voltage surge produced by a power
failure. You might wish to unplug the TV for an hour or more. If this
power reset does not allow the TV to turn on component failure is
indicated. These sets are assembled using the wave soldering process
they are known for having cold solder connections. The safety circuitry
shuts the TV set down or will keep it from turning on when it detects a
problem. This model of TV has over 2,000 parts, which includes millions
of transistors inside the integrated circuits. The capacitors will
change value, leak and become defective. Resistors will change value
and burn. Diodes and IC can go bad. This may have a domino effect and
cause other parts to fail. Replacing one defective part may make the TV
operate for a short time but the part will fail again if the parts that
caused the failure to begin with are not replaced. The only way to know
for sure which parts that are no longer within factory specs and for a
proper repair all the electronics must be diagnosed by someone with the
correct electronic test equipment specifically designed for TV service
and the skills to use the test equipment. I wish I could tell you there
was a quick fix or button to push that would fix the TV but that is not
the case or the solution needed to get the TV operating correctly.
Hi there , dont no if this is any help , i have the same model that would display an image when its in setup mode but as soon as you choose tv or computer it would go blank with just sound , did not find the exact fault there s a small short to do with the backlight board , but when i remove the backlight connector from the main pcb and remove the yellow ? wire from the connector the one on the xtal side of the connector and refitted the connector with out the yellow wire the tv worked fine .
Led blinking Three times means B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.
If you have electronic knowledge you may be able to fix it. Let me know if I could help you further. Hope this helps.