I have a sharp lc-43n4000u set that was struck by lightning surge. How do I start diagnosing the problem? Just repaired a Samsung 65 inch with the same problem. Replaced main board and it works fine. I tried the same procedure with unplugging the main board and plugged the set in but it did not power the backlights up. Where do I start?
-
-
Re: Sharp lc-43n4000u
Not all TV brands turn on their backlights when the Main Bd is disconnected. Some SAMSUNG TVs do. Most likely the Main Bd in the SHARP TV is destroyed, also. However, we would need photos and voltage readings to better assess your situation. -
Re: Sharp lc-43n4000u
Start by providing good clear pictures of the backside of the TV showing all the boards so we can see what we are dealing with.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: Sharp lc-43n4000u
If a TV was hit by lightning and backlights will only come on with main board disconnected from power board does that mean main board is the problem?Comment
-
This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.
I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
model: BN41-02844E
I want to connect serial debug line, but the usual scheme of 4 contacts for pins is present 3 times, under the board top part, if connect them always in the same way GND, RX, TX, i obtain the same very short log in right snd left ports , the center port gives me no output, i whish to be able to enter some menu or even the service menu trough this.. could anybody address me how to? Later i will swap RX-TX in the center port but almost suremy is disabled..
thanks -
What would cause a main board to die when you disconnect AC power to the TV?
This is the second board that it has happened with. All I am doing is disconnecting the power cord from the wall and plugging it back in.
I replaced the main board because I was not getting a signal on PS_ON when pressing the power button. The PSU was/is still sending its 5v standby signal
Thanks -
Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM
Comment