Sharp Aquos LC-60LE810UN troubleshooting

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

here is the scenario. And of course this is just my theory.

The rise and fall voltages of the pins adl and acl don't match because overtime the leds in the series get out of spec. The driver IC recognizes this fall and feels that it is in led strip that has gone bad. In essence to prevent failure the power supply throws the 11 code. the mainboard picks this up as a failure which really isn't a failure. You replaced the LED's that were bad so you know that you have a complete circuit in each LED strip they may not be matching in the high megohms but they are working so there's no worry of straining or loading down one of the inverters. So it should work. Of course as long as you can connect the panel you can see what's going on.

for me all I had to do with these TVs is hold down the volume up channel down upon plugging it in. Once that's done you don't have to do this again unless it comes unplugged.

[ijohannessen]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Yes, will do. But first I have a job interview to attend to.

[kerbsjacob]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Cycle power, immediately start holding power button for 5 seconds, you will get interruption on the existing flashing error code. A brief out of sequence flash. Next hold volume down and input at the same time. While holding those two, press and release the power button. Set will come on ignoring the error. Press vol down and chan down till service menu appears. Clear the lamp error.

All this has to be done quick after power is applied. Takes practice to get it right

[ijohannessen]

Re: Sharp Aquos LC-60LE810UN troubleshooting

I assembled the TV and I still get the same error code( 1 - 1 ) after resetting. Looks like the LCD panel is bad, no? Could it be the main board?

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Are you getting voltage at stb when you power on? Aldo you tried vol+ ch- then while holding these you plug in and release buttons after 3 seconds?

[mlite3939]

Re: Sharp Aquos LC-60LE810UN troubleshooting

First of all, I'd like to thank the contributors to this site. I've learned a lot from this forum.
I have a Sharp Aquos LC-60LE810UN with a blank screen, 1 -1 error code(Lamp error) flashing when plugging in the TV. Not possible to get to the service menu or resetting the error via CH- and VOL+ when plugging in the TV. I've tried to replace all three boards to no avail(I am a novice). From this forum I learned it is either a LCD panel or backlight problem. So I took the panel apart, tested the LED strips, found 2 open LEDs which I replaced with diodes(1N4148). The panel's LED strip configuration is: 2 x 50-LED strips on top/bottom and 2 x 30-LED strips on each side.
I successfully tested the 30-LED strips with a battery pack of 10 x 9V batteries. For the 50-LED strips, I tested each LED individually(phew!).
So now I am assuming the backlight is ok, but I want to test it before assembling the panel. My test setup includes the chassis with LED strips installed, PSU/inverter combo board with BU5V(standby) jumped to PS_ON and PNL_POW via a 1K resistor. However, the backlights do not light up. When I measure the LED driver voltages(between LED_DRV1+ and LED_DRV1- and so on), I get ~27VDC - 25VDC for each LED driver. Each LED driver powers 80 LEDs, so I would expect over 240VDC. Any pointers as to how to proceed from here?

I have the 810UN also and i have a question about testing the LEDS with the 90v battery pack..I tested the strips of 30 LEDs and all but one strip lit up bright, the other 30 strip lit up but dim. I used the same 90v pack to test the 50 LED strips and got nothing.All the strips are marked 94v, whether its a 30 or 50 strip..Should the 50 LED strip have lit up?

[tom66]

Re: Sharp Aquos LC-60LE810UN troubleshooting

50 LEDs will require a greater voltage than 30; when using a high voltage battery always connect a limiting resistor in series to limit damage, around 22 ohms 15W should be OK (or e.g. a 40W light bulb.)

[ijohannessen]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Yes, 90VDC is not going to light up the 50 LED strips. I was too lazy to get more batteries so I tested each one individually with my meter. One tip I got was, if any LED is burned out it is likely to be next to the connector. That was true in my case too. How did you lift the LCD off the TV panel? I used suction cups(meant to be mounted in the shower) that I borrowed from Home Depot.

[ijohannessen]

Re: Sharp Aquos LC-60LE810UN troubleshooting

I replaced two bad LEDs with diodes(1N4148). You could use a jumper in too. I basically grinded down(with my wife's nail tool) the existing LED until I could solder diodes on the terminals. I tested afterwards with my 90V battery pack and it lit up. For the 50 LED strips , I assume you would need something like 130-140V to test. LMK how it goes.

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

since I just got done learning about the 80 inch version of this Set except for the fact that mine is backlit instead of edge lit I would say if you're not getting anything at as soon as you plug it in before you plug it in hole down input volume up and power and see if you get a quick flash the LED's this process will take about 30 seconds before the LED's light up for a split second

so does that mean the lcd/led screen is still good. as i do get a flash when i perform this?

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Yes im sure the actual screen is ok. considering that upon powering it up I would say that there is still some inconsistency in the LED array pattern so I would try to locate a good LED strip. Then see if it stays powered up. I am still researching a way to bypass the error on the driver IC so it doesn't recognize an error. I still have this TV here same model and very soon I'm going to pull the screen out and the LED strips in this one as well as when I got it the unit was stripped of all boards so something is up. considering that you get a quick flash of light before it shuts down tells me that it is reading the LED pattern and there is still something missing with the impedance check on the strips. exactly how long does it stay lit for before shutdown?

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Is the screen uniform? Can you see a dark spot in an area briefly? Im also assuming your error code is 1 blink?

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Yes im sure the actual screen is ok. considering that upon powering it up I would say that there is still some inconsistency in the LED array pattern so I would try to locate a good LED strip. Then see if it stays powered up. I am still researching a way to bypass the error on the driver IC so it doesn't recognize an error. I still have this TV here same model and very soon I'm going to pull the screen out and the LED strips in this one as well as when I got it the unit was stripped of all boards so something is up. considering that you get a quick flash of light before it shuts down tells me that it is reading the LED pattern and there is still something missing with the impedance check on the strips. exactly how long does it stay lit for before shutdown?

see what i did is hold vol - channel + and power(while pluged in) it then bypassed the 1 long 1 short error followed by a quick flash. i can then take a flashlight to the screen and see the picture. i have been doing some research and have found that it very well could be the psu/inverter board as i have just order 1 on ebay for 90$. if that doesnt work i found a web site that has led back light and lamps............ http://www.ccflwarehouse.com/

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

also i would like to know what the meter should spike at when im testing the L1 and L2 leads as im not getting any thing,which either the board is bad or im testing it wrong.

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

i found this video on the CCFL tube and a good possibility to hopefully help some one out. hope it works,i havent got a chance to try it yet. https://www.youtube.com/watch?v=6YC6_Jog7YA

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Ok well if the psu does not fix it then remove the lcd panel carefully and check each led with a voltmeter in diode check mode.

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Ok well if the psu does not fix it then remove the lcd panel carefully and check each led with a voltmeter in diode check mode.

what should it read?

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Not sure but a good voltmeter like a fluke in diode check mode should light up each individual led testing each one on each strip. If one does not light up its bad.

[dtvteck]

Re: Sharp Aquos LC-60LE810UN troubleshooting

Not sure but a good voltmeter like a fluke in diode check mode should light up each individual led testing each one on each strip. If one does not light up its bad.

has any one figured out how or why after replacing bad smds tv still does sam code

[freakaftr8]

Re: Sharp Aquos LC-60LE810UN troubleshooting

I dont believe actual diodes are going to put the load on the other leds in series like an actual led would do so leds are probably the optimal way to repair the issue. Thats most likely why the set was not repaired.