Re: Driving a Sharp TCON/panel with a universal main board

To add to the above, I am also looking for some basic tests that might confirm that the panel is good. I only have back light currently. There is no difference if I disconnect the ribbon cables from the TCON to the panel. I can never see any pixel turn on. Should one half of the panel display white when the ribbon cable for that half is disconnected? I am not seeing that. Could it be that the panel is the culprit?

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...

Re: Sharp LC-46D85UN works for 2 minutes shuts down with a pop

Here is an update:

Probed PNL_POW when TV is working and when it is hung. Both read 3.14 V. No difference at all. Also, probed the PNL12V pin on the power board per budm's suggestion. I read 11.94 V regardless of whether the TV was working or not.

I am attaching pictures of the whole backside of the TV including individual pictures of each board. The part # of the power board is RDENCA336WJQZ.

These pictures were taken when the TV was in a hung state. You can see the backlight...

Re: Sharp LC-46D85UN works for 2 minutes shuts down with a pop

Thanks. Will check out the video.

Here is an update. Probed PD connector at the main board after the TV hangs up. Here are the values:
Pin--Name--Value
PD1--13.5V --12.81 V
PD2--13.5V --12.81 V
PD3--13.5V --12.82 V
PD4--13.5V --12.81 V
PD5--SGND-- 0 V
PD6--SGND-- 0 V
PD7--SGND-- 0 V
PD8--SGND-- 0 V
PD9--AC_DET--2.98 V
PD10--PS_ON--2.81 V
PD11--BUS5V--4.94 V
PD12--PNL_POW 3.14 V

These values look normal,...

Re: Sharp LC-46D85UN works for 2 minutes shuts down with a pop

Thanks for the input. I plan to open the TV up again and probe the main board for power supply values coming out of the regulator. Is there anything else I should be looking at? I am not able to make too much sense of the small red flashing LED in the middle of the main board. Does that indicate something?

I am hoping somebody can help me out with an issue with my Sharp LC-46D85UN LCD TV which is nearly 10 years old.

Here are the symptoms:

--Turns on normally, stays on for around 2-5 minutes, picture disappears with a pop from the right speaker.
--Backlight stays on, power LEDs both stay on, no blinking. Remote is not responsive when it is in this state.
--Power button on TV is not responsive for single press. If I hold it long enough, the TV will shutdown.
--The TV will turn back on again either with the remote or with the power button on the...

Re: New Members - please post your introductions here

Hi Everybody, very glad to be part of this wonderful forum. Have learnt a lot from reading the messages. Now looking forward to contributing my own experiences as well as be able to find solutions to problems I am experiencing.

Hope to find the bad caps in my problematic circuits soon :-)