Question about Dynex DX-LCD37 TV
Was working fine recently, today attempted to turn it on and red light only came on, no picture, attempted then to turn it off and red light remained on so it didn't turn off
The fault is with its main power regulator board itself. SMPS section is not oscillating. It will be best to contact any service technician. For more information go to http://electronicshelponline.blogspot.com/
Posted on Nov 26, 2013
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Posted on Jan 02, 2017
Unplug it from the wall, wait 2 minutes and plug it back in. if problem still exists, its probably the main pcb.
Posted on Aug 21, 2008
This type of failure could be in the LCD controller board or the power supply might not be providing enough voltage to the main board and LCD controller.
Let me know if you require further assistance locating the boards or part numbers.
Posted on Sep 28, 2009
SOURCE: No Picture-white screen
Ur Tuner board,that the tv signal came into that board.U have a little manchanical skill.Take ur tv aparts.Replaced that Tuner board ur tv will work again.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner board to replacement.
Posted on May 11, 2010
The standby 5vdc is working but not the rest.
Please see my basic troubleshooting guide here:
Posted on Jun 19, 2010
It's a backlight or backlight inverter issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)
If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.
In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.
If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx
With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight. With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing
I hope this helps.
Posted on Jul 21, 2010
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