Sharp LC-40LE810UN question

[Krebstar]

Re: Sharp LC-40LE810UN question

So after taking the back off, I have been running the tv for about 8 hrs now with no back light flicker. Could it be the set was over heating with the back on? I that would explain why it wouldn't flicker right away, but after 5-10 minutes or so. I noticed there are no vent holes above the power board on the back of the case. Why would they do that? Seems that component would be sensitive to heat.

[Krebstar]

Re: Sharp LC-40LE810UN question

Opened my tv up today to inspect things. I think Im just going to replace all the optos since they ( form what Ive read) seem to be the likely suspect. Does anyone have a source for these optos? My usual electronic suppliers don't seem to carry them. Is there a comparable alternative?

Cosmo
1010
817
K10
H

[budm]

Re: Sharp LC-40LE810UN question

Power supply board is made by DELTA (DPS-126CP) so it is not allowing Sharp or other companies to release the diagrams.

[rievax_60]

Re: Sharp LC-40LE810UN question

The local TV repair guy says that the power supply schematic is often not included in TV service manuals as it isn't with this one.

[Krebstar]

Re: Sharp LC-40LE810UN question

I found the instructions confusing also. I remember making sense of it, I don't fully remember the details now.
Most are developing a shutting down problem with 2 flashes of the standby LED. This is caused by optpo-coupler PC7703 in the AC_DET circuit gradually losing gain. My TV had this problem first. I fixed it by reducing the resistor on the its LED side.
The TV then developed a flickering problem a few months later. I found another failing opto in the back-light circuit. At this stage I decided to replace all 4 optos.

Thanks for your quick response. I plan on taking a look at the boards this weekend. Maybe Ill just replace to opto and go from there. Is there a schematic floating around somewhere? Thanks again !

[rievax_60]

Re: Sharp LC-40LE810UN question

I found the instructions confusing also. I remember making sense of it, I don't fully remember the details now.
Most are developing a shutting down problem with 2 flashes of the standby LED. This is caused by optpo-coupler PC7703 in the AC_DET circuit gradually losing gain. My TV had this problem first. I fixed it by reducing the resistor on the its LED side.
The TV then developed a flickering problem a few months later. I found another failing opto in the back-light circuit. At this stage I decided to replace all 4 optos.

[Krebstar]

Re: Sharp LC-40LE810UN question

Hello,

Some searching via google has led me to this thread. Not to post hijack, but there don't seem to be many threads about this set. I also have the LC-40LE810UN Tv. For a few months now the set will work just fine. Then, after 5 minutes or so the back light will begin to flicker ( much like an old neon tube). Its more of a sporadic flicker ( different intensities) then a steady pulsing.

It happens on every input regardless if it is receiving a video signal or not. When I go to turn the Tv off, the screen ( not the 'V') flashes 6 times slowly. I cannot find any information on this particular blinking. Most people with issues seem to have the 'V' blinking error codes. There isn't even a 6 blink code in the service manual ( that I saw).

Can anyone offer any suggestions? I'm fairly handy with electronics and such If I know where to look. Power issues? Over heating?

Also, can anyone translate the directions on how to enter the adjustment process mode ? What does "Before entering the adjustment process mode, the AV position RESET in the video adjustment menu" mean? Do I need to just highlight reset or do I need to actually reset the input? Kind of confusing. I was going to check the menu to see if any errors are listed.

Thanks for any help !

[rievax_60]

Re: Sharp LC-40LE810UN question

It is difficult to follow your problem. Did you rule out the PC7703 opto?

[iuliantv]

Re: Sharp LC-40LE810UN question

no idea ?

[iuliantv]

Re: Sharp LC-40LE810UN question

Hi everyone, I have a similar problem with a Sharp LC-40le810e, front LED flashes 2 times and break and flashing 2 times, and so, according to the service manual,, Flashes 2 times 2 Power supply error (* 2) UR + 13V error,, really I lack this tension, though I try to remove EPROM memory, but do not realize is this memory, all have a strange notation,, ic2004 (denoted by 402m 40b2) 5001 IC (24lc21ai) thank you

I took ic2004 (denoted by 402m 40b2) the same error, I think IC5001 (24lc21ai) has something to do with this error because it is located in the hdmi I tried starting the service mode with the following variants STBY and V-, STBY and V + and p + STBY, STBY and p- without result

[iuliantv]

Re: Sharp LC-40LE810UN question

Don't do shorting pins .Can you desolder that chip .Power up with removed eeprom chip.Tell what is the blinking code.What i think after a few unsuccess power ups (errors ) , firmware write code in this chip to prevent from further power on(may be for safety )

Hi everyone, I have a similar problem with a Sharp LC-40le810e, front LED flashes 2 times and break and flashing 2 times, and so, according to the service manual,, Flashes 2 times 2 Power supply error (* 2) UR + 13V error,, really I lack this tension, though I try to remove EPROM memory, but do not realize is this memory, all have a strange notation,, ic2004 (denoted by 402m 40b2) 5001 IC (24lc21ai) thank you

[rievax_60]

Re: Sharp LC-40LE810UN question

The back light began to flicker. I found opto PC7701 to be temperature sensitive.
It seems that the optos in these power supplies are from a dud batch. I suggest that all four of them need to be replaced. I left the resistor mod in place.
I have rarely seen optos fail for their own reasons.

[mattstolte]

Re: Sharp LC-40LE810UN question

anyone?

[mattstolte]

Re: Sharp LC-40LE810UN question

can anyone help me? im seeing alot of different things. i have this 52 model and im getting the 1-1 blink code. 1 fast 1 slow. i did the rest and got the tv screen to power up and the left side was alot brighter then the right.. then i unplugged it and had to do a reset again to get it powered on and this time i couldnt get anything to appear on screen but baclight did come on. brighter on left again. the only voltages i had before i do the reset is the 5v bus

[rievax_60]

Re: Sharp LC-40LE810UN question

Here is a snap I took, showing R2019's location.

[rievax_60]

Re: Sharp LC-40LE810UN question

Sorry I missed your post. There is an 82K resistor in series with the LED side, R2019. I soldered a 68K resistor on top of the existing resistor.
I don't blame the optocoupler. The 82K resistor doesn't pass enough current through the LED.

[sda]

Re: Sharp LC-40LE810UN question

Hi,
I have also got a AC-Det error (2 slow and 1 fast blinks)
No VCC voltage on PFC IC and Backlight IC.

What exactly did you find?

PC7703 opto chip was found faulty.
Replaced with a PC817 which was an hand, and all is well.

Cheers

[sda]

Re: Sharp LC-40LE810UN question

Hi,
I have also got an AC-Det error (2 slow and 1 fast blinks)
No VCC voltage to PFC IC or Backlight IC.

What exactly did you find?

[rievax_60]

Re: Sharp LC-40LE810UN question

I was looking for the wrong reason. The cause of the shut-downs was a bad AC-Det signal.

[rievax_60]

Re: Sharp LC-40LE810UN question

There is another IC on the secondary in the power supply involved with LED control, DDA003.
Has anyone found its data PDF?
This TV runs for a few minutes, then the Error line pulses high causing a shut-down.