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Most sets have it labeled PSON but yours is one that is different, but you found the right pin to check and if its going to 3.4 volts then the main board is sending the signal to the power board to tell it to turn on power factor correction, the next question is the power board doing that?...on the power supply board there is a hot and cold section, look at the hot section and find a larger capacitor, one at 100 plus mfd at around 450 volt, hook your meter across that capacitor, when you turn the set on you should see about 160 volts and when the power button is pushed it should go to around 360, see if that happens, also be careful around that capacitor as it holds a charge way after the power is unhooked and from experience it doesn't feel very good to get across that...lol
Flip the TV over! Just kidding!! When you installed the main board was it identical to the old main board? If so, you might want to look at the old board and ensure there are no jumpers that needed to be set on the new board. Some companies make generic control boards for tvs but have different jumper settings for different models. The jumpers are just little black blocks that connect different pins to each other on top of the circuit board.
the main board should have a jumper that is labeled CLR CMOS you need to switch the jumper the pins 1 & 2 over to pin's 3 & 4 make sure you understand that this is for the mainboard factory reset if you're looking to reset the computer's operating system and programs to factory settings that is a different procedure.for that I believe you need to hold down the f12 button well you're turning the device on hold the button down until you get a menu the menu will guide you through the procedure
You will need the user's manual for your machine to make sure that you are hooking the wires up correctly. However, most motherboards label these connections directly on the motherboard next to their pins. Look for an area on the mother motherboard with two rows of six to eight pins. Next to them you should labels such as PWR_SW (power switch), RST_SW (reset switch), HDD_LED, PWR_LED, etc. You won't mess anything up connecting something to the wrong pins, but it isn't that hard to figure out as the wires are usually labeled in the same manner as the pins. So HDD_LED would plug into the HDD_LED pins, PWR_SW to PWR_SW, etc.
front wires are usually for power, hdd led. power button and reset
button and sometimes extra usb ports and audio ports. All motherboards
have a small section that has 8 to 10 grouped pins protruding that you
can attach these wires to. The motherboard will diagrahm where the pins
hsould go. For example the light for the hard drive wires are probably
labeled "HDDLED" and there is two of them. One positive charge and and
ground. On the motherboard, in the grouped pins there is a small label
''___' '_____' HDDLED PWLED
look like this but in a different arrangement. What does this mean?
Connect HDDLED to the top two pins. Doesn't matter which way the
positive and ground go. And connect the power led PWLED to the bottom
pins. Follow this for all the other labels.
You seem to know a bit about troubleshooting. do you know what the inverters are? they are ballasts for the flourescent backlight. they are a circuit board that is on either the far left or right of the back of the panel, sometimes they are on both side (depends on the panel used)
from the power supply board there will be a multi pin connector going to the inverter board. Look at the power supply end of the connector and find the pins labeled 24V. If that voltage is present when you push the "on" button, your power supply is working and your main board is working. You have bad panel. Too expensive to repair.
If that voltage is NOT present. Look at the power supply board for capacitors that have bulged tops. Replace them with same value... if no capacitors are obviously bulged- your main board is bad.
There is usually a set of pins on the corner that are labeled get a magnify glass and light up the board take the glass and look down on one of the corners it is usually on the right corner of the bottom of the board at the bottom of the desktop case. You will usually see a series of abbreviations. LED, HDD, PWR, RES or RE the pins are marked. Now on the wires to the power button you will see the same wire abbreviations. Just hook up the HDD wire to the HDD pin the PWR to the PWR button wire and so on. RESET wire is RE or RES etc. Those really are the only three you will need. Not sure of the exact abbreviations. But they are lettered enough for you to match them. The best thing to do is try to download the board specs and get a look at the pins one side is neg and the other is positive it would be to your best interest to find the mother board specs for you mother board since you went all over the internet and could not find the board specs. just match the LED and the others they are marked PWR is the main and HDD is just showing when the HDD is working. The reset is for the button to reset the computer. It is basic and not that complicated really. Thanks for using FixYa! John