Sharp aquos LC-40LE810E

[Jstone86]

Re: Sharp aquos LC-40LE810E

Next is to keep the DCV meter on the PL connector, remove the ribbon cables between the LCD panel and T-CON to see if the PL connector will jump up to 12VDC or not when TV is turned on.
BTW, did you do the test with the dummy load?

After I removed the ribbon cable between lcd and tcon board I got same voltage 0.67v.i couldn't do the dummy test cuz I was waiting for the KIA378R12PI ic I ordered from online. Even then am confused on how to do the dummy test cuz I am a novice so if you can please upload any pics /vdeo or link to any post here with instructions on how to do the dummy test. Thanks

[marksik]

Re: Sharp aquos LC-40LE810E

HI guys.

I have the same problem as topic starter.

I already replaced resistor r7019 to new one (33k), also used 560 ohm resistor for this trick with 9-11 cables. I think that after this trick with cables (but before 7019 resistor replacement) I saw that screen turned on for couple of seconds.

But it was only once. After resistor replacement TV still doesn't work. When I turn it on, for 7 seconds its front V-light turns on without flashing. Also I see that red LED on motherboard turns on after 5 seconds. And then red LED turns off and V-light starts blinking (2 short blinks then nothing, then again 2 short blinks and again).

Then, if I press Power button on its remote for 2 second, V-light turns off then turns on without flashing, and LED on motherboard turns on and we have the same story as I described above.

Help me please.

P.S. I didn't replace optos, just bought them at AliExpress.

[marksik]

Re: Sharp aquos LC-40LE810E

Update. I tried Vol - CH + Power trick. Screen backlight turned on but no image. Just brigth screen. Red LED on motherboard blinking with 5 sec period. When I turn the TV off with remote, it turns off, then U can turn it on again (without image).

But if I use its hardware button and turn it off, it doesnt turns on again, I have to use Vol - CH + Power trick again.

[marksik]

Re: Sharp aquos LC-40LE810E

Update. I tried Vol - CH + Power trick. Screen backlight turned on but no image. Just brigth screen. Red LED on motherboard blinking with 5 sec period. When I turn the TV off with remote, it turns off, then U can turn it on again (without image).

But if I use its hardware button and turn it off, it doesnt turns on again, I have to use Vol - CH + Power trick again.

And the same happens if I put back cable #9 without resistor. I can turn on the backlight but with no image.

[Aussie_Matt]

Re: Sharp aquos LC-40LE810E

Hi guys, I have a Sharp LC

[Aussie_Matt]

Re: Sharp aquos LC-40LE810E

Hi guys I have a sharp LC-40LE820X, and the main power board is a DPS-126CP B.

I can display pictures from a usb for hours on end.

When on TV function, after a period of time (20 minutes or so) the picture becomes choppy, then appears to turn off: When I try to turn it on it then has a warning similar to "service has been changed, execute auto install".

I suspect a power supply issue: Does this sound right?

[Aussie_Matt]

Re: Sharp aquos LC-40LE810E

I've just brushed the dust off: It appears C7813 s cracked.

[Davi.p]

Re: Sharp aquos LC-40LE810E

Aussie: don't make confusion, you have a different issue, open up your own discussion.
Marksik: to make long story short, no need to change any resistors, put back the original ones, and change the optocoupler, if the AC_DET works again try the tv, if it work no more inspect/change the KIA voltage regulator..

[marksik]

Re: Sharp aquos LC-40LE810E

Aussie: don't make confusion, you have a different issue, open up your own discussion.
Marksik: to make long story short, no need to change any resistors, put back the original ones, and change the optocoupler, if the AC_DET works again try the tv, if it work no more inspect/change the KIA voltage regulator..

Davi.p, thanks for your answer. I changed all optos (4 pics) and nothing changed. Situation remaining as described above. Can you please point on KIA voltage regulator - where I can find it on the board. Did you mean 4-legs element (kia378r12) which is situated under the metal shield?

Thank you

[marksik]

Re: Sharp aquos LC-40LE810E

I ordered KIA378R12PI from eBay. It will come in 2-3 weeks and I will inform about results.

Damn, I have been waiting for optos about 1 month and now I have to wait another month

[marksik]

Re: Sharp aquos LC-40LE810E

Just measured voltage at pin 12 of that 12-pin connector and got 3,5V. Also measured pin 1 of PNL-12V connector and got 12 volts.

But it all drops in 5-6 seconds, so may be KIA is the real problem...

[budm]

Re: Sharp aquos LC-40LE810E

Just measured voltage at pin 12 of that 12-pin connector and got 3,5V. Also measured pin 1 of PNL-12V connector and got 12 volts.

But it all drops in 5-6 seconds, so may be KIA is the real problem...

When the 12V at the PNL-12V disappear, is the PNL-POW (control signal to turn on the KIA switched 12V regulator IC) still around 2.5 ~ 3VDC? If the PNL-POW is <1V then there will be no 12V at PNL-12V.
The typical failure of the KIA regulator is that the output will be only around 7 ~ 8V when it is bad.

[marksik]

Re: Sharp aquos LC-40LE810E

When the 12V at the PNL-12V disappear, is the PNL-POW (control signal to turn on the KIA switched 12V regulator IC) still around 2.5 ~ 3VDC? If the PNL-POW is <1V then there will be no 12V at PNL-12V.
The typical failure of the KIA regulator is that the output will be only around 7 ~ 8V when it is bad.

When 12v disappear (it drops to 0), PNL-POW voltage drops from 3,5v to 0,13v...

To be more specific, I still operate with this resistors trick and I have changed all 4 optos to new ones from AliExpress.

Now when I turn on the TV it has its V-light solid on the front panel. Also I see red LED on the motherboard (it turns on in 3-4 seconds after TV turned on). Then, in 5-7 second red LED on the motherboard turns of and V-light on the frontal panel starts blinking (2 times then again 2 times loop). Also when red LED disappear I start to hear noise from motherboard - hi-frequency noise.

[budm]

Re: Sharp aquos LC-40LE810E

PNL-POW command is from main board, so when it drops below 1V then you'll not have 12V to run the T-CON.

[marksik]

Re: Sharp aquos LC-40LE810E

PNL-POW command is from main board, so when it drops below 1V then you'll not have 12V to run the T-CON.

Could you suggest the possible fail cause?

For me it looks like TV starts normally, then in 5-7 second something goes wrong and TV starts blinking with its V-light.

[budm]

Re: Sharp aquos LC-40LE810E

What error code are you getting?
You need to report the Voltage readings on the connector of the power supply that goes to the main board.

[marksik]

Re: Sharp aquos LC-40LE810E

I have 2 short blinks - pause - 2 short blinks pause loop.

PIN 1 - 13,05V UR13.2V (SIGNAL)
PIN 2 - 13,05V UR13.2V (SIGNAL)
PIN 3 - 13,05V S13.2V (AUDIO)
PIN 4 - 13,08V S13.2V (AUDIO)
PIN 5 - 0V SGND (AUDIO)
PIN 6 - 0V SGND (AUDIO)
PIN 7 - 0V SGND (SIGNAL)
PIN 8 - 0V SGND (SIGNAL)
PIN 9 - 4,08V AC-DET: - note - there is no cable from AC-DET side because I put it at pin 11 with resistor
PIN 10 - 3,05V PS-ON
PIN 11 - 5V BU5V
PIN 12 - 3,27V PNL-POW

[marksik]

Re: Sharp aquos LC-40LE810E

I just realised that sometimes when the TV is on and I press Menu button at remote, V-light starts to blink 5 times (5 short blinks) but after 1 cycle of 5 short blinks V-light returns to its common behavior - 2 short blinks.

[marksik]

Re: Sharp aquos LC-40LE810E

What error code are you getting?
You need to report the Voltage readings on the connector of the power supply that goes to the main board.

Yep, I checked all twice. All above is correct

[budm]

Re: Sharp aquos LC-40LE810E

Yep, I checked all twice. All above is correct

Your post #153:
When 12v disappear (it drops to 0), PNL-POW voltage drops from 3,5v to 0,13v...
Your post #157:
PIN 12 - 3,27V PNL-POW conflict with your result in post # 153.
So is it staying at 3.27V or it drops down to 0.13V?