Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

[rted]

Hello to all, this is my first post. Have called Sharp to ask about the blinking pattern, 2 long 5 short. No help they only want your address to do a service call. So I decided to find out what is the root cause of the blinking fault code 2 long pause 5 short.

I have good knowledge of electronics, soldering using a muli meter reading schematics etc. Just looking for a direction, have ordered a service manual, am ready to roll my sleeve, put my glasses on and eager for some guidance.

Thanking you all in advance.

RT.

[johnboy1313]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Try disconnecting the ribbon cables between the tcon and the panel. If the TV then powers on, the panel has failed. If the TV still has the 2-5 code, I would change the tcon.

[R_J]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

2 slow flashes followed by 5 fast flashes is panel power supply error, here is the Tech tip.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Hi Johnboy1313, thank you for the reply. I should get the service manual download sometime today, it's from a Spanish site APITE. Will be removing the back panel cover sometime today or tomorrow.

Should I do the reset procedure first?

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

2 slow flashes followed by 5 fast flashes is panel power supply error, here is the Tech tip.

Thanks for the Sharp technical pdf R_J, wonderful guide. Will post my findings once the procedure has been completed.

Have a great day!!

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

I wanted to add, I was able to force start the TV over half a dozen times and the picture was normal also watched a 3 hr movie over the weekend and all was good.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

2 slow flashes followed by 5 fast flashes is panel power supply error, here is the Tech tip.

Thanks so much for your assistance and technical reference pdf.

[R_J]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Here is the manual, but they are usually not much help.

[newtothis]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Get it open and give us clear pics of all your boards and layout (So we can point things out if needed) ... After that we can start helping more

[R_J]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

These have the lcd board located at the bottom of the screen which is very susceptible to water damage, If too much cleaning liquid is used and it runs down the screen that board is usually the first to get wet.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Here is the manual, but they are usually not much help.

Thank R_J for the service manual. I actually just got mine. Paid $4.00 from a site. It's always good to have for reference purposes.

RT.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Her are the board pics. Tested the Tcon board voltage at connector PL no voltage at all 4 pins. TV continues to flash 2 long 5 short.

Thanks,

RT.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Get it open and give us clear pics of all your boards and layout (So we can point things out if needed) ... After that we can start helping more

Board pics done. Thanks, RT.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Attached is the wiring block diagram and flashing pattern diagnostics. Need help to locate where to take the 12V panel reading.

Thanks,

RT

[R_J]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

I can't say for sure but I think panel + 12 is on the PL plug on the tcon board.

[budm]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Check for DCV on both ends of the Ferrite Bead FB4801 to see if you do have 12VDC against chassis GND.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

Thanks for the advise regarding 12 VDC readings.

I have taken DC voltage readings at the 4 pin PL Plug with no DC voltage present. See attachment

[budm]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

OK, you need to check PNL_ON pin and PNL12V on the power supply board PD connector.
There is white glue covering up PD-10 names, I believe pin 10 is the Pnl_on PIN.

[rted]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

OK, below is the location to test for 12V DC on the Power board, is that correct? I'm at work now but will do the voltage reading tonight.

Thanks for your suggestion.

[budm]

Re: Sharp Aquos LC-70LE732U Blinking Pattern 2 -5

OK, sorry it is not pin pd-10 (the white glue was covering up the prints), I found better pictures from shopjimmy.
It is PD-16 (PNL-POW) which is the receiving pin for Panel power on command from the main board, it should be >2.5VDC, when this command signal is received by the power supply board, it should turn on the electronics switch to supply the 12VDC output at PD-1-2 (PNL12V) to feed the T-CON board.
Pictures provided by shopjimmy.