No power some resistance R603 brunt in power supply board

If it was hit by lightning I'm guessing there are more issues with the power board, that is the one that takes the brunt of a lightning strike or power surge

I would inspect the power board for mushroomed caps and brunt traces. A edge lit led screen has two ribbon cables coming from the power supply, I would unplug one at a time to see if one side lights up. Both led strips rarely go bad at the small time. The problem is most likely in the power supply.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

Power surges wreck havoc with power supplies since they are first in line and bear the brunt of the rushing power. Try replacing the power supply board on the cheap by getting a used one on ebay to minimize the expenditure in case that is not it. Always a possibility,

Is there any numbers on the power board? From looking at the posts on this machine, it appears that getting parts and support for this are hard to do. Can you tell what parts are bad? Do you have any test equipment? Can you solder?

tried to disconnected the 24v supply connectors going to the power inverter board which may the cause of voltage drop. after you disconnect then if still no output 24v dc coming from the power supply board the cause will be bad power supply board. check for an open resistance or bad regulators going to the 24vdc out. by the way you should connect all the connectors going to the main board to turn on the processor and the inv_on voltage going to the inverter board.

Unfortunatly, a 7 blink error can mean all kinds of things. If you are handy with a DVM then you should be able to diagnose the problem. Odds are, you either have a bad SC board, a bad SU or SD board, or in worse case scenario . . . a bad panel.

Unplug the unit and take the back off the unit.

Start with the power supply and disconnect the top two cables. They go to boards on each side of the power board.
Take your DVM and measure resistance on pin 1 of both connectors to chassi ground. If either are shorted, then your power supply is damaged. If checks ok, then move to next step.
Measure resistance on the same cable, except this time on the SC board side. Make sure cable is still disconneted. If there is a short, then your SC board needs replaced. If not, move on to next step.
Disconnect the SC board from the set. The two little boards that are left on the side need resistance checks. If bad - replace. If ok . . .well your panel is bad. I hope this helps.

Pleasant day!

The problem could be the power supply or the main board.all you have to do is to follow this simple and easy way of troubleshooting.

1. Remove the cover.
2. Plug-in your DVD player and power it ON to perform a voltage data/check.
3. Check the input power of the DVD.Use multimeter tester to test the AC voltage (AC range).It should have 120v or 240vac depends on the requirement of your DVD or the main supply that comes on the outlet.If no voltage reading,your power cord have a continuity problem.Replace it with the same type and A.W.G number standard.
4. If the power cord got voltage reading.Next is test the output voltage of power supply such as 5vdc for the main board and logic supply using multimeter (DC range).If no voltage reading,the problem could be the power supply board.

Check the following parts which commonly breaks on power supply board.

• The power transistors (regulators)-It is commonly binds on heat sink and found on the primary of the chopper.use a multimeter (range diode test) to check if it is shorted.
  
• The fuse-able resistors-it is the resistor that have low resistance such as 1ohm 2.2 ohms etc.It is usually found near the power regulators/transistors.Use multimeter (range resistance) to check if it is open or change value.
  
• The capacitors-it is the one who can store voltage.If you have capacitance meter you can test that,if none just look at the appearance of the capacitor if it is bulge on top or leak.

NOTE: If you found the defective parts that mention above,replace it with the same type and ratings.
When the problem is still there,The problem of the power supply is major and not for D.I.Y.I suggest to send it to the qualified technician or just buy a new one.

5. If the power supply have output voltage.The problem could be the main board and unfortunately the main board is not for D.I.Y because composition of the board is very sensitive.The only way to fix it is to buy a new main board unit.

I hope this solution could fix your problem.Please response if you have any comment and question.Thank you and good luck.

Scenario 1: The TV turns on then shuts right off

• In this case, the power supply unit is being loaded down by any of the boards it supplies. A short circuit is being detected in any of these boards. These boards are connected to the indicated connectors on the power supply unit shown below.
  

• The resistance, both in reverse polarity, of the cables from the boards specially the ones with indicated voltages need to be checked. Short circuit is present when resistance on both instances is zero.
  
• The board with the indication of a short circuit must be replaced.

Scenario 2: The TV turns on then shuts off after some time

• A heat sink overheats. Make sure the TV is placed at least 4 inches away from the walls. This will allow proper air circulation. You can also provide a fan. Have it checked by a qualified technician to prevent further damage.
  
• The power supply is faulty. It is usually caused by leaky or bad capacitors like the ones shown below.
  

• Replace the capacitors with the same specifications.
  

Warning: Service of a qualified technician is necessary to carry out the troubleshooting and repair to avoid personal injury and further damage to the unit.

THR1 is reference designator for the component on the PCB. What is the marking on the component. THR1 is a thermo resistor and is probably a TO-237 outline package. On the black tab part of the device it should have a marking like R100 or PCT with a symbol to represent the manufacture.

The ThinClient's (neoware) don't take much power, like LCD monitors. I have replaced countless 470uF caps in LCD's, so I'll bet it's the one. A possible test, however, is to desolder it, take a multimeter set to measure resistance, and connect the leads of the meter to the leads of the capacitor. Watch the multimeter screen; it will go up in resistance if the cap even works and holds a charge. You'll want the multimeter on the highest resistance test setting, and it will go up fast, so be watching. You will have to short the cap in between multipul tests to get an accurate reading.
[email protected]