Sharp LC-70C8570U

[nelson6861]

I have a sharp tv with a blink code of 2 blinks and 5 flashes. I have no back lights when it is powered on.
I removed the back and tested all back light. They all work.
I took reading and it seem everything points to the main board. Any help... im also thinking i will need schematics for this tv and a reset to get rid of fault code.
The tcon board looks like it had some thermal issues from pictures

[freakaftr8]

Re: Sharp LC-70C8570U

1st of all how did you test the backlights did you remove the LCD panel in physically power the backlights with a dmm?

If you look on this forum you will see many postings about faults with sharp LCD TV's especially the 70 Inch panel. When you 1st power the TV do you get a solid light light before the 2 - 5 Flash? Do you see any indication of the back lights coming on even briefly before shutdown? Also we would watch your monitor voltage to the tcon. you should be getting 12 v to the connector

[attainteddragon]

Re: Sharp LC-70C8570U

pin 15 stby voltage is present, but pin 14 ps/on command is missing.

so right now you are not getting your on command from the main board to turn on the ps.

[freakaftr8]

Re: Sharp LC-70C8570U

Hold down ch+ vol- power while plugging it in. Or try ch- vol+ power.

[budwich]

Re: Sharp LC-70C8570U

if your attempted "power checking" was done with the tcon disconnected as shown in your pictures, then it is unlikely that you will get "ps-on"... you need to have at least one "side" of the tcon connected to something (ie. two cables).

[freakaftr8]

Re: Sharp LC-70C8570U

if your attempted "power checking" was done with the tcon disconnected as shown in your pictures, then it is unlikely that you will get "ps-on"... you need to have at least one "side" of the tcon connected to something (ie. two cables).

I believe sharp tcon will function without the panel connected is long as a tcon is connected

[nelson6861]

Re: Sharp LC-70C8570U

I have a led backup light tester for leds.
I removed led and tested then individually.
When i power on tv, i got nothing from panel no lights.
I tried the fault re set combo but may be im doin it wrong.

[nelson6861]

Re: Sharp LC-70C8570U

Also plugged tcon board back in...
Measure 0v tcon connection on main board also

[nelson6861]

Re: Sharp LC-70C8570U

Sorry.. i miss spoke..
No 0v on tcon board should be 12v

[nelson6861]

Re: Sharp LC-70C8570U

I am suspecting main board....
Any schematics or where i might find...
This board is expensive and hard to find...
Dkeymf953fm01... or would fm06 or other versions work

[nelson6861]

Re: Sharp LC-70C8570U

Ok retested and used the right fault reset
Vol down and input..
Had 12v on tcon board....

[nelson6861]

Re: Sharp LC-70C8570U

Green led light is flashing on main board...
I am goin to retest power supply point..
Still same fault code 2/5 no leds light up and they were tested good

[nelson6861]

Re: Sharp LC-70C8570U

Ok results from power supply reading.
Also reading from Led connector 83 volts.
This is with power ON condition

[nelson6861]

Re: Sharp LC-70C8570U

Ok new reading from bridge rectifier and regulators on the board... i think i am getting close

[freakaftr8]

Re: Sharp LC-70C8570U

Okay all this is going on with the panel connected to the T con or not?

[nelson6861]

Re: Sharp LC-70C8570U

Yes all connections are made on tv

[nelson6861]

Re: Sharp LC-70C8570U

Okay all this is going on with the panel connected to the T con or not?

Yes t con board is connected

[freakaftr8]

Re: Sharp LC-70C8570U

Ok try the same procedure with all 4 ribbons disconnected from tcon to panel. That you will still have the tcon connected to mainboard Then try just the left two thenr the right two

[nelson6861]

Re: Sharp LC-70C8570U

Ok try the same procedure with all 4 ribbons disconnected from tcon to panel. That you will still have the tcon connected to mainboard Then try just the left two thenr the right two

Ok i will

[nelson6861]

Re: Sharp LC-70C8570U

Right ribbon cable disconnected /left connected to t-con board.
-no fault code flashes
-no picture or backlights

Left ribbon cable disconnected / right connected to tcon board
- 2/5 flash fault code
- no picture or backlights