Will a bu board for an 52xbr9 with a LTY520HH02 panel fit on an 52xbr9 with a LTY520HQ01 panel?

LCD TV Troubleshooting 4 Quick Tips

How to Troubleshoot Common Flat Screen TV Problems

I would match the following between the two boards.
(1) Match number of connectors.
(2) Match the location of the connector
(3) Match the direction of the connector
(4) Look for the overall size of the board just to be sure the mounting screws can fit your tv
(5) Ensure at least all the external connectors location and internal ribbon wires shape and size match 100%.
(6) You may choose to buy a replacement card even if they offer fewer HDMI ports if you don't need that many.
(7) Research in ebay, tvparts.com or other popular website for validating that that the two are only reversion or updates.
(8) the date stamp on the pcb can indicate which is newer
(9) ask the vendor of the ebr board if it is compatible to eax.
(10) Newer boards may require base firmware update too. so research and keep the latest firmware information handy.
Post the pics of the both the boards if you have.

Do a hard reset to this set, and check. if it do not help you, its main board is faulty. There are two ways 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; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Sounds like main board fault. 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 section 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. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.

Check whether the audio is muted by accidental press at remote control button. Enter its sound menu, and check it. If muted, as you know there will be no audio output. If not muted, check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; just Google for the site "Electro help". Surf the site with patience. Pull up older posts.

The board that call the T-CON board it is dying and dead soon.That why it is causing horizontal or vertical lines and distoted pictures.This T-CON board sit in at the bottom in the middle of the tv LCD screen panel and it only job are to decoded pictures pixels before it go onto the tv LCD screen panel.Tries websites Shopjimmmy.com,Ebay.com to buy a whole new refurbish T-CON board for the replacement.

Check the Inverter Board, its not working.

You need to sync the balance board with the console. Instructions are in the manual. Sync button for board is in battery compartment and sync button for console is in panel under reset button.

Took a few tries for me, be carefule not to hold sync button on console down for longer than 10 seconds because it will deregister all wii remotes.

I have the same problem with mine and since Acoustic Research went out of business, I too have been looking for a solution. I may have found an alternative to throwing away this really nice speaker. I found a company on the web that appears to sell an amp that may fit nicely into this speaker enclosure for $99.00. Check it out...http://www.partsexpress.com/pe/showdetl.cfm?DID=7&PartNumber=300-805

UPDATE Feb-16-2016: This Amp is still going strong since 2012 when I replaced it. The price has gone up to 139.00, but may still be worth it to replace a bad one given the cost of Sub's today.