Sharp aquos LC-40LE810E

[iuliantv]

Re: Sharp aquos LC-40LE810E

40LE810
for 2 blinks change Optocoupler
pc7701 pc7703 pc7702 pc7901
mai mult ca sigur doar unul e defect,dar nu am mai stat sa vad care ,e al treilea intalnit cu acest defect,la primul ma chinuit ceva ore,acum e doar rutina
more than sure only one is defective, but I didn't wait to see which one, it's the third time I've encountered this defect, the first time I struggled for a few hours, now it's just routine

[Davidpuffy12]

Re: Sharp aquos LC-40LE810E

Ok. I have bought resistors. 560 ohm for AC-DET fix.
Also bought 68k smd resistor and also 33k and 4 opto-couplers.
First I will fix that AC-DET and will post results.

Also I got crazy idea. If everything fails, is it possible to buy some lvds to hdmi converter and use this tv only for set-top box? I don't want to do that now. Just if it is possible

Do you still have the links of the things you bought to your sharp TV?
I have the same problem as you, and I would like to repair it.

[marksik]

Re: Sharp aquos LC-40LE810E

Tried to return all original parts (except optos) and cables to their previous places. Situation is the same - after 5-7 seconds voltage drops to 0 and V-LED at fron panel starts to blink 2 times - pause - 2 times pause.

And I still try to find out wether it is the problem with power board or main board to be able to detect the problem.

[marksik]

Re: Sharp aquos LC-40LE810E

Let's try to remember this old discussion without to read back all...
The resistor trick was a method to avoid changing the faulty opto, but you changed the optos so there's no need of the resistor, keep it out of the tv!

Yep, but I don't have old one unfortunately.

And I don't understand what could make the problem when voltage drops in 5 seconds after turning on.

Is this a power board or main board problem?

[Davi.p]

Re: Sharp aquos LC-40LE810E

Let's try to remember this old discussion without to read back all...
The resistor trick was a method to avoid changing the faulty opto, but you changed the optos so there's no need of the resistor, keep it out of the tv!

[marksik]

Re: Sharp aquos LC-40LE810E

Anybody can help me in this situation? May be some suggestions what's wrong with TV? is it mainboard or something else?

[marksik]

Re: Sharp aquos LC-40LE810E

I received mine KIA378R12PI, replaced but still have the same problem

[nomoresonys]

Re: Sharp aquos LC-40LE810E

Wondering if they sent jstone86 a bad KIA378R12PI, it's strange that he got even less voltage after the change out.

[marksik]

Re: Sharp aquos LC-40LE810E

[marksik]

Re: Sharp aquos LC-40LE810E

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?

So can I get some more advises?

[marksik]

Re: Sharp aquos LC-40LE810E

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?

No, there is no conflict. When I turn on TV with its hardware switch PNL-POW has 3,5v. And in 5-7 seconds after TV is on it drops down to 0,13v.

It happens at the same time when red LED turns off and 12V at the PNL-12V drops to 0.

May be my English is not perfect but I hope the situation is clear.

[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?

[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

[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

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

[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

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

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

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

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.