Repair issues I had my tv repaired in august, it took a month. They said the main board for the tv had fryed. I got the tv back on a thursday and had it plugged in for two hours and the tv went out again. (no picture, no sound, light comes on to indicate power.) I left it unpluged until friday evening tried it again, didn't work. Unplugged it again and plugged it back in saturday night and it works. Can anyone suggest what might be going on. Thanks in advance.

had a similar problem with my lg and it took 3 tv repair service visits with main control board being replaced on 1 visit that fixed for about 1 month then failed again, eventually the last engineer replaced the capacitors on the main control board with more robust capacitors and that solved it . hope that helps

It's not the x main. 90% of the time it's a y buffer that goes out. It's usually the top buffer. 3/4 of the time the buffer takes out the y main board too. You cannot just replace the y-main or buffer because it will just burn out the other within seconds. Also about 1/4 of the time it'll take out the top transformer on the power supply too. The solution? First disconnect the power to the y main board. turn on the television and check the voltages coming off of it. Careful it's high voltage 208V! Remember it's DC too. Then disconnect the buffers from the y main board. You can try powering the y-main up to see if the little LED lights up. This does not indicate it's working though but it'll tell you if it is possible to fix. The fixes for these boards is only for electronics guys. It usually involves replacing 1-3 capacitors and 1-4 FET's. Since a bad buffer can take out a good y main in seconds it's usually recommended that one replace all 3 boards at the same time. It's a $250 fix. How do I know all this? I've now repaired 5 of these televisions. I owned one and spent close to 600 repairing it. I bought misc parts and broken sets online for months before I had 2 different repair guys walk me through the process of repairing them. I had so much cash tied up in parts that I bought 3 more dead sets and repaired them to justify all my spending. I've never had an x board fail. I've had EVERY top buffer fail. I've had all but 1 y-mains fail. and 1 lower buffer fail. I've also had the y buffer fry it's top chip, blow a capacitor and FET on the y-main, and fry the top transformer on the power supply before my eyes. It only took 5 seconds. Replacement of the 3 y boards will almost always fix the sound but no picture problem. Hope this helps!

Ur tv have major Main Tuner signal board issues. Take it back where u bought it and get replacement.Or call Philip for a warrenty repair.To replaced the Main Tuner signal board.

it would be better to reset it to factory settings first and then configure the settings the way you want it afterwards... do you know that guy? is he even working for a known repair shop in your area? he might not be a certified repair guy...

Hello,

I had exactly the same problem with my LE40B550 which I bought in July. I phoned the place I bought it online (eBuyer) and they put me in contact with a Samsung repair centre who fixed it under warranty. It took them 2½ weeks to fix it and get it back to me. The note that came back with the TV said they had replaced the IP board. I think the part number was H40F1 9HS.
The repair centre paid less than £50 for the board (it shows on the returns paperwork).

If you only bought yours in August, and haven't had it fixed yet, I suggest you just get in contact with whoever you bought it from and get it done under warranty.

main board part number is 75004719 you should be able to google it to find it.

IR senor may not be bad. Try using a different remote (universal) and program to TV. If universal remote works and your doesn't, you may need to purchase a remote instead of IR board. If you confirmed that the IR board is bad then replacing the IR board will fix the remote issue. IR board is an easy fix. Just open the back cover out and it's located right in the middle toward the bottom of the TV.

ours is doing the same thing first time they said a circuit was loose. Repair man due back out Tuesday

I was lucky to get a tv repair shop that was a Sanyo authorized dealer to talk to me about this issue.
They told me that they had 3 of these tv's in and they said they were all repaired by replacing "3" parts. they are:

the Y SUSTAIN Board - Part # LJ92-01200a
the Y-Upper Buffer Board Part # LJ92-01202a
and
the Y- Lower Buffer Board Part # LJ92-01203a

I am in the same boat. I amd going to rip the back of my tv off and verify the part numbers. I HAVE NOT REPAIRED MINE YET.. so take this for what it is worth. The Repair shop gave me this info because they were going out of business and did not intend to take any new tv's in for service. The girl who gave me this info read it out of the service repair tickets from 3 Sanyo DP42746 tv's that had the same symptoms as my tv.

Please post back if any one has taken action.

I realized that there is a 90 day warrantee on parts and a 30 day limited warrantee on labor for the  repairs that were done. As I stated, the original problem was the picture shrinking after a few minutes of the set being on. The repair firm took my control board with them. When they came back to install the repaired control board in my set there was a load spark during the installation, after which I had a black screen and no sound.  The repair firm took my set them and installed a "CAP Kit", a STRM6511, and a "D1881". The set worked perfectly until two days ago.
I called the repair firm an they are coming out this Thursday to check out my TV.   I am hoping the problem is related to the failure of one of the parts installed to fix a similar problem which occurred after the sparking incident.