No display power led always blink
Hello, the good thing is that the led flashing is a blinking fault signal, the blinking means there's a faulty circuit. here's what you may want to do if your semi electronically inclined find a online service manual site, and at times it is possible to try a free manual search for your specific model,. the amount of times the light blinks will determine the faulty board. exchanging that board or repairing the faulty components it the tricky part. working at high heat levels and for extended periods of time may overheat and damage internal circuits and this is typical with these flat screens. but different manufacturers have different blink codes so it's a model specific manual you will need for this repair, and as in the other previous answers you may want to consider shipping/part cost/ before you go about servicing it. If you can handle this type of repair check auction sites for the boards it is way cheaper than service center pricess for boards, hope this helps.. have a great day.
SOURCE: lg flat screen model 26lx1d
The blinking red light signals the fact that the power source is in protected mode - it's fully functional (as the green light also shows) but has been shut down by it protection system.
The protection system of the source is engaged when 2 things happen: either there's a short on one of it outputs (you will have to test the output voltages to identify the failing board and from there if the board can be repaired - start with the inverter) or if the processor can't load the firmware - this is almost always caused by a hardware failure of the processor and in that case the mainboard will have to be replaced.
In that case it will cost you around $200 to get a replacement board, plus the labor. Now you must decide if the tv is worth that amount of money - in my opinion it doesn't.
SOURCE: Doesn't power up. Relay clicks several times,
First of all you should weight the cost benefit of repairing the set versus purchasing a new one.
Depending on the size and model of tv, it may be more prudent to simply cut your losses and buy a new tv rather than spend money swapping out circuit boards in the hopes of repairing a set in questionable condition already. Main / Power Supply / LCD Controller boards will typically run you about $100 each to replace, so weight that against the purchase price of a new tv that comes with a warranty.
Given that, if you are still intent on trying to repair the tv, and it does since you have gone out and acquired a service manual, there are steps you can take.
First of all the service manual should give you some idea what the blink pattern means on the front panel lights. Look that up first.
It does sound power supply board related, but bad capacitors are not always as obvious as the tell-tale bulging or gunk-leaking ones.
Use the manual to find out what voltages you should be getting out of which wires coming off the power supply board. In general, some will be 5VDC, some will be 12VDC, and some will be 24VDC. Test them with a multimeter and see if you are missing any.
Obviously this test requires you to have the unit plugged in and powered up with the safety covers removed. I cannot stress enough the potential dangers involved and if you are not confident with that level of maintenance, I would recommend you leave the live power tests to the trained technicians.
You said you didn't see any bad capacitors, so you may want to just unclip, pull out and then reseat all the multi-wire connector you can get to in case one of them just has a bad connection.
Good luck in the troubleshooting.
If you have any questions or require any further assistance please comment back on this page and I will do my best help you. Please provide the model number of your tv next time as well.
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Thank you very much.
Joe.
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