sharp aquos LC-80LE632U led tv lamp error

[tom66]

Re: sharp aquos LC-80LE632U led tv lamp error

The LEDs will be driven by a constant current circuit. The constant current circuit will increase the voltage the LEDs are driven with until the current matches. If an LED is open the voltage will hit an over-voltage threshold and the PSU will shut down.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Good to know. Looks like ill be pulling the panel apart tonight.

[capkid]

Re: sharp aquos LC-80LE632U led tv lamp error

"hey all well I picked up this 80 inch Sharp Aquos" - LOL. Someone must be made of money to just give up on an 80-inch TV. I'm off to do a Craigslist search.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Well I pulled the panel and powered up the tv. Every LED is lighting up. I cannot get a reading from each strip. Do I have to measure every diode independently? They all light up the same lumens as well.It is backlit.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error



here it is. All leds lit. Quick snapshot before it cycled off to error blinks.

[budm]

Re: sharp aquos LC-80LE632U led tv lamp error

Boy, what did you use to lift 80" LCD panel?

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

My naugin. Lol. Just taped the carriers to the screen and lifted it out. It was tricky!

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Well screens back in. Obviously the led array is not the problem. Now im looking into power supply. Especially the led controller.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Led controller IR2E67M sharp manufactured. What pin does led monitoring short and open led monitoring? Thinking of "temporarily" disabling it.
it's obviously a false code all the LED's are working perfectly

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Well in other sharp tv's like the 32 inch there is a chip cap C7558 that you can bridge to get the ic to not time out and throw an error code. I wonder if that applies to this design as well? I am looking for C7558 and cannot find it.

[tom66]

Re: sharp aquos LC-80LE632U led tv lamp error

Yeah there probably will be a timer cap.
Can you post a picture of the LED controller?
Also, check LAMP ERROR signal, if present, from PSU to main - you may be able to jumper this.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Got a pic, ill upload it. What would I short lamp error signal to on the wire loom to the mainboard. Ground possibly?

Pin22 on cable is just stated error. Thats it is this lamp error possibly?

[tom66]

Re: sharp aquos LC-80LE632U led tv lamp error

Yeah through a 100 ohm resistor to limit current though.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error



led controller/ driver

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Btw I used a 150 ohm from error pin to ground. Same issue.

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Here's the whole back side of the board

[tom66]

Re: sharp aquos LC-80LE632U led tv lamp error

Ugh, well it's probably a semi custom Sharp IC without a datasheet.
Check LAMP ERROR what does it do? Go high, low, what? After this, BL ON/OFF (or similar) changes too?

[johnboy1313]

Re: sharp aquos LC-80LE632U led tv lamp error

What happens if u put in your old board?

When I put the old board back in, it worked fine but no HDMI's. I wound up pulling the EEPROM from the old board and putting in on the new board. Now everything works but the WI-FI, which did work on the old board. I haven't figured that one out yet. Ethernet does work however.

[budm]

Re: sharp aquos LC-80LE632U led tv lamp error

I hate EEPROM problems!

[freakaftr8]

Re: sharp aquos LC-80LE632U led tv lamp error

Heres the pinout.