20 Most Recent Astar LTV-20SD 20 in. EDTV-Ready LCD TV/DVD Combo Questions & Answers

Most often, this symptom is a result of a failing POWER SUPPLY but a faulty MAIN BOARD can certainly cause very similar symptoms. Unfortunately, without a donor TV to swap parts with or a dedicated test rig, it can be very difficult to differentiate between these problems.

One quick way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one, since this is the most often the source of the trouble.

You can usually find replacement supply circuit boards online by searching for your TV's model number.

Here is a link to a replacement POWER SUPPLY IRCUIT BOARD for your TV currently available on Ebay for about $39 US plus shipping:


And here is a link to a replacement MAIN CIRCUIT BOARD for your TV in case you needed it currently available on Ebay for about $59 US:


Just use your mouse to click on the links, which are the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.

The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed if necessary, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit boards and confirm that they exactly match the ones provided in the Ebay listings. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty itself as well.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit boards. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.

Here is a link to another Expert's solution to a similar problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:


These guides will give you some idea of the various problems with LCD TVs and monitors and the associated repair procedures.

If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.

Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck.


Astar LTV-20SD... • Answered on Sep 15, 2011

What is the signal source for the TV? How long do you have the TV on before it goes off? If the issue is a power-saving (No Incoming Signal) one, then the data cables may not be transmitting the signal (or the source may be at fault). Try new data cables and check the source signal using another monitor. Another possibility is that the unit is going to sleep inappropriately (or not waking from sleep). In this case, your best option may be to replace the unit. (If it is under warranty, contact the manufacturer.) It would take a fair amount of work to determine if the control board or the power supply is at fault. However, you could try to track down the issue by opening the TV and looking for any leaking or bulging capacitors. A third option is overheating of the unit and the self-protection circuit is coming into play or a part is loosing contact with the board. (Bad solder joints are a real pain to track down and as the unit heats and cools the contact between the solder around the wire and down to the board will get worse.) If you use the speakers and the screen display goes "off" but you still have audio, then I'd suspect the LCD inverter or the backlight. This problem would occur on all sources and the onscreen menus. (The backlight itself usually fades or makes the on-screen image change to pink/red.) 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. 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.) The scorch mark and smoke may indicate a resistor or zener diode that had been used as a fuse and is now gone. 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 inverter 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. Separate the panel from the bezel. 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. See http://www.lcdparts.net/howto/default.aspx for more information but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx. Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.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. I hope this helps.

Astar LTV-20SD... • Answered on Jul 10, 2011

Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board.

Astar LTV-20SD... • Answered on May 03, 2010

Your mainboard is damaged, replace it and that will solve your issue.

Astar LTV-20SD... • Answered on Jun 06, 2009

Hello, Your tv main board is defective. just call me at 323-767-6030 and I will help you go through the trouble shooting.

Astar LTV-20SD... • Answered on Mar 29, 2009

Hello sir,
Your tv needed to program the reset. fixable, just call me at 323-767-6030 and I will go through with you.

Astar LTV-20SD... • Answered on Jan 16, 2009

Unplug The T.v And Hold The On/Off For 30 Seconds Then Release And Plug It Back In.

Astar LTV-20SD... • Answered on Jan 14, 2009

You will need to find the close caption feature in the menu adjustments and turn it OFF. You should do it for all the individual channels that have it activated.

Astar LTV-20SD... • Answered on Aug 20, 2008

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Astar Televison... • Answered on Jul 04, 2016

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