How do I check a power supply board on a 50 in led tv
The TV turns on and I hear sound but the back light flashes on for a split second on startup. I checked the LED supply line out of the power panel. I have 2 positive and 2 neg posts to check. On startup I get a reading of like 150 then it steadily decreases until it settles on 78. Is this normal because the video I viewed on youtube showed a reading of 135. That was on a smaller TV and it only had 1 positive and 1 neg post. What else should I check? Or should I just replace the power supply board?
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If your screen is blank with sound, first test the screen with flash light. If you can see the picture, the back light is faulty. if it is fluorescent, replace it. If the back light is LEDs, check power supply board might be the supply voltage to the back light fails after few seconds due to faulty components especially bulging capacitors.
You need to find out which board the led driver resides on. The main board sends a signal to the power supply board to turn on the LED's Look on the power supply board for swollen capacitors. They all have to have flat tops. If any are bulged, they have to be replaced www.shopjimmy.com. TV Parts Universal TV Stands DLP Chips ShopJimmy These guys can tell you which board you need.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
Some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
Now tv turn on have power LED and OPC LED lights indications flashes together?Yes,this problems,it is the tv Tuner signal board it is causes and the problems.That the board where the incomming broadcasting signal cable plug into it.If turn tv on.No power LED light or any kind LED lights at all.Yes.Than the tv power supply board that the cause and the problems,that the board where the tv power a/c cord plug into it.U have some basic mechanicals skills like take things aparts and putting it back together again?Yes,tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv Tuner signal board or tv power supply board for the replacement.
Yes,the LED power lite on the front panel stable?Yes,mean the DM power supply board is good.LED power like blinking,mean the DM power supply board is dead.DM power supply is good,still making that clicking sound,when turn on.Mean ur Blast board is dead,that the board that help to light up the projection lamp.
Follow these steps to figure out what problem is.
When you turn on TV, look at the back and see if the back light on. If it is on, the power supply and inverter work fine. The suspection now is main board and T-con board (the small board on the middle-top of the panel)
To find the problem from the main board or not. Look at the power supply and measure Vs on - turn on the TV, this approx 5 vlt DC needs constant once you turn on the TV. If it is drop or unstable - main board problem - replace it.
If Vs on is good - disconnect the T-con cable from the power sup. If power sup stop clicking - T-con need replacing. Hope it help.
Sounds more like blown/exploding capacitors on the PSB-Power Supply board. No OSD-on screen display a blinking led or chatter/relay clikcing at startup is the tv going into fault protection and bypassing the startup pins. The YSUS-Main controls the pic which is attached to 2 buffer boards the YBU-upper YBL-Lower. They control the upper and lower portion of the OSD and the YSUS controls both of them. Since you're getting No OSD you need to check for blown caps on the PSB first. Unplugging the set resets the error again. So you start all over again.