Hi there I got a Sanyo 26" lcd hdtv replaced the main board and tested voltages as the service manual indicated and all of them are fine, could you tell me where is the T-CONN board in this unit. 'cause its at white screen, audio ok. model: DP26648 chassis num: P26648-03 thanks in advance and congrats for your site

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.
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hmmm..so you have power from supply board?

can you isolate the power supply board from control board, via connectors?

It sounds that the main digital board to your TV has damaged. But, before make it confirm, a through check should be done. Contact any experienced service technician for help. The work is skilled one, that a user cannot do it with ease.

Check and replace its power supply regulator board. Seek tech support.

hi you will need first to isolate where the problem might be so try to plug other unit or device in your power surge like a dvd player. if it is work your lcd tv have problem now how are you going to fix your tv, use a philip screw driver and open the back cover to gain access the internal part. since doesn't turn on check the power supply first which is the main source of supply of all the board. replace blown fuse and other defective part. bulged capacitor will not work good replace it use the panasonic brand atleast 105c ratings it is effective. thanks hope will help you to fix the problem.

Tv now have it on green LED power on for good and tv flashes of pictures only for few min,than dies and have sound left only?Yes,take the tv aparts.U have all the tools and understanding basic electronic also can do basic soldering work too?Check the tv power supply board,that the board where the power a/c cord plug into it.Check the tv power supply board carefully for dead and dying components parts call capacitors.These dying and dead capacitors parts most likely all of the times,will bulges up or puffing up onto it tops.Changes all these dying and dead capacitors parts components,will solved this problems 70% of the times.If the tv power supply board it is good and no dying or dead capacitors component at all.Than the tv a long board that call the LCD inverter board it is dead.This LCD inverter long board are to helping the LCD screen panel to have a backlight to produced a picture.The tv long LCD inverter board have no parts for sale indivitually,al way have to buy a refurbish whole long LCD inverter board for the replacement.Also if you have no tools and soldering skills to fixed the power supply board by replacing capacitors component parts indivitually too.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board or a long LCD inverter board for the replacement.

board burnt out where can i purchase a new one

If the unit is under warranty, return it to the manufacturer for a replacement or a refund.
What you need t check is that the voltages from the printed circuit boards to the LCD panel are giving the correct voltages, also check the logic printed circuit board for shorted components or incorrect voltage values, if after checking the voltages frim each printed circuit board, everything is testing ok, the problem may be that you need a replacement LCD panel. But make sure to throughly check the main printed circuit board for any faulty solder jouints , or dry joints, as well as any blown or shorted components. I hope this helps. Good luck.

Information from Sony:
Audio Output Error (6X)
There are three possible failures that can cause a 6X protection mode, and they are as follows.
• Short Audio Amplifier Outputs
• Lose of 15V Supply
• Lose of 9V Supply
The key to determining what to check first is if audio is heard before the TV shuts OFF.
If audio is heard before the TV shuts OFF, then the next step is to check the 15V supply at CN7503/pin 1. If the voltage is missing replace the G1/G2-Board. If the voltage is present, first check the fuse PS7001 for a possible easy fix. If the fuse is OK replace the AU-Board.
If no audio is heard before the TV shuts OFF check for 9V at CN9502/pin 1.
If the 9V is missing replace the BU-Board. However, if the 9V is present check and confirm that the protection circuit output voltage is making it to the Main Microprocessor IC1001/pin 26. If 2.8V is present at IC1001/pin 26 then the Main Microprocessor is defective. Replace the BU-Board. If the voltage at IC1001/pin 26 is 0V then the audio output circuit has actually failed. In this case, replace the AU-Board. A shorted audio output or a DC voltage level measure across the audio output will cause a 6X protection mode indication. In either case the problem will exist in the audio circuitry on the AU-Board.

I had a similar problem like yours with a different TV. I had to find the Service Manual for the TV to really find the problem. The manual gives me every schematic and parts number list for every board in the TV. It turned out to be a bad Inverter Transformer. It was one of six that powered the LCD screen. You might have the same problem.
The Service Manual on the internet for most TVs are under $20. It's the best material for diagnosing the problem. It worked for me.