TV turns on but no picture. The status light works. In the upper right hand corner of the power board, I am measuring voltage on the cabe that feeds the main board. I have 3.5 volts on the bottom terminals (like I should) and I do not have 12 or 24 volts on the upper terminals which I should. My thinking is I need a new power board. I was watching a youtube video from shop jimmy and the video said if you have standby power the main board is bad. The video did not address the missing voltages? Any advice on if I should purchase the power supply board or the main board?
It could be either main or power board issues
SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing
You can look at the various module failure symptoms and service / replacement options for the L42HDTV10A here:
http://www.coppelltvrepair.com/search?Q=l42hdtv10a&As=false&Pf=&Pt=&Sid=false&btnsearch=Search
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. Viewing it in "Mosaic" or "Magazine" will make surf easy.
http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
LCD simple panel check. In a dark room, (does not have to be total), shine a flashlight at it with a station tuned in. If you see images
and you have changed the panel HV board, your flourescent tubes could be bad. If you dont, then check the cabling.
Testimonial: "The back lights are on just video on the panel tv turns on and off as it should just not picture."
SOURCE: Need repair advice for LG 60PN6500 Plasma TV Issue. Additional details are shown below.
John have you tryed the t.con board it sounds to be the problem B.O.Luck
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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