I replaced the 10v 2200uf caps and also one 10v 1000uf cap. After that, it finally worked again, but now it won't turn off. It powers down, then a few seconds later it starts up again with the HELLO message.
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You have bad caps on the SMPS. Replace the caps or get a new SMPS. Caps would be cheaper but if you don't know how to solder then you will have to pay some one, which then it would probably still be cheaper. The caps that you will need are either 1000uf 10V or 2200uf 10V. Not sure which one but it will say it on the caps once you remove the SMPS.
check your power supply. remove it then remove the metal plates on top of the psu. ill bet you find 2x 1000uf 35V ,4 x 1000uf 10V and 3x 670uf 35V capacitors that are swollen or leaking. if you replace the 1000uf caps it will work but if the 670uf caps are swollen as well its a good idea to replace them as well. the 1000uf capacitors can be bought at radio shack for around 10 dollars. you can use the 1000uf 35V caps for the 1000uf 10V caps if you cant find the 10V ones . the 35V caps are a little bit bigger but still work . you will need a good soldering iron (35-60 watts) and a good desoldering tool . easy to do if you know how to solder.
This might be two seperate problems, But sometimes just this simple one can fix both. You power supply is bad. The caps. used in them are under rated at 10 volt and should be at 16 volt or better. They should be replaced and that should fix your problem. REPLACEING the power supply will just have the same problem happening again. If the purple dots do not go away, Can be the T-con/LCD controll board or the main PCB board. Have the power supply repaired.
If you are good at soldering? The caps that are bad,the tops of them look rounded and are NOT flat.
They also have a neg - side. Important put the neg - side where it belongs, board should be marked - or circle w/one side darker or lines in it. That is the neg side.Common bad Caps are 1000uf 10v,1500uf 10v,2200uf 10v,and 3300uf 10v. Replace the same "uf" rating but with a 16-25 volt or higher.
Most likely 3-4 caps on power supply bd 2200uf 10v or 1000uf 10v look for tops of caps bulging alittle( if bulging any and not flat bad caps) replace with same value but a higher voltage 15v-20v will do. Common problem.
You need to replace the power board,Or replace the capactors on it.
Replacing the capactors is the best idea.They are under rated at 10volt insted of 16volt or higher. They cost less too. If you replace the board,you will still have the same problem again later. They are usualy 680uf 10v,1000uf 10v,2200uf 10v,and 3300uf 10v. Replace them with the same uf but 16v or 25v EXPANPLE use... 1000uf 16v or 1000uf 25v
They are polorised Blak spot on board is the - side of cap. Stripe on cap is -. The caps. swell if they are bad. The tops round out,or the X on top breaks anfand black or brown goo comes out. Top should be flat. It I can assist you further please feel free to ask. email@example.com
Power supply most likely... It's a common problem with this particular model and we've seen quite a number of them for exactly what you're describing.
You need to replace 19 caps in the power supply 4) 3300uf/35v, 8) 2200uf/25v, 6) 1000uf/10v, 1) 1000uf/16v and you can go a little higher in the voltage of each cap for greater reliability.
It's best to have an ESR meter also and test the remaining caps as well.
Replace 19 caps in the power supply, 4) 3300uf/35v, 8) 2200uf/25v, 6) 1000uf/10v, 1) 1000uf/16v and ESR the remaining caps for good measure. That should repair the problem in about 99% of the cases. I do several of these a month...