Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

[freakaftr8]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

OK so now it's looking like there's a possibility that it's not the panel at all. 12v when You power up t v now?

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

12V.... where? I have ribbons back into tcon. The only pins with power are BU5V = 5 V and AC_DET = 3V

PS_ON goes high when power button pressed. Other than that...?

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

Crap...forgot to mention...when adding an input, the xbox, I had the HDMI in port 8...when it didn't come up, I switched to HDMI 6, and the display showed the xbox home screen. Does that tell me the main board is causing the issues?

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

Attached is another code chart. My code seems to be an Initial communication error. I can't find a code chartspecific to my model. Should I pick up a main board?

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

DET_15V error
Flashes once
H: On
L: Off
DET_15V (34pin) error (L). UR13V is not applied.
If error is detected during operation, error standby is activated by
polling.

I believe this is my error code. Does the PS generate the 15V or does the main?

I assume the PS, I'll go through the wiring and schematics and see what I find.

[freakaftr8]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

I believe 15v is applied by power supply.

The 12v I was referring to is the input to tcon at P4084 coccector.

[budwich]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

you need to redo your testing.... first you need to get your set to power on as you have found via the force sequence. then, once you have done that.... check the next stage.
power off, disconnect both tcon to panel cables... power up. your set should be able to this repeated power up without going into the fault flashing mode. once you have done this you can try the subsequent single cable testing which i don't think you did correctly.

[freakaftr8]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

you need to redo your testing.... first you need to get your set to power on as you have found via the force sequence. then, once you have done that.... check the next stage.
power off, disconnect both tcon to panel cables... power up. your set should be able to this repeated power up without going into the fault flashing mode. once you have done this you can try the subsequent single cable testing which i don't think you did correctly.

He already did this and after a few tries he confirmed that it went into fault cycle even without the panel connected to the tcon so at this point I don't believe it is the panels that's at fault. More or less a slow to ramp up voltage regulator or capacitor somewhere. Cold starts after sitting seems to be the problem.

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

He already did this and after a few tries he confirmed that it went into fault cycle even without the panel connected to the tcon so at this point I don't believe it is the panels that's at fault. More or less a slow to ramp up voltage regulator or capacitor somewhere. Cold starts after sitting seems to be the problem.

Yes, exactly. Although, by looking at the schematics, I'm not 100% where the 13V is originated. One schematic it looks like it comes from a couple 8 pin ICs on the main.

The AC_DET line on the power board loops back down to the connectors back to the main. Kinda confusing.

I haven't attempted to plug in the set today, so I almost guarantee it will start up normally, but for how long is in question. Should I take a video of what happens as I do the tcon removal from panel test and post a link so you can view what I see?

[budm]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

When the TV will not start I would monitor the AC_DET error pin (it is part of the protection circuit that will not allow the TV to come on if the incoming AC is not within the AC Voltage range) which is fed to the main board and see what you get when the TV will not start. If you search the SHARP TV threads about AC_DET, the common failure of the AC_DET is due to bad OTPOISOLATOR on the power supply board or the resistor network on the LED side of the OPTO has gone up in value, the OPTO is also affected by the temperature.

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

When the TV will not start I would monitor the AC_DET error pin (it is part of the protection circuit that will not allow the TV to come on if the incoming AC is not within the AC Voltage range) which is fed to the main board and see what you get when the TV will not start. If you search the SHARP TV threads about AC_DET, the common failure of the AC_DET is due to bad OTPOISOLATOR on the power supply board or the resistor network on the LED side of the OPTO has gone up in value, the OPTO is also affected by the temerature.

This makes prefect sense. It would explain why it works at first then goes to fault. I watched a video on YouTube showing how using compressed air or freeze spray helps find bad components. I'll pick up a can tomorrow and test it. For now, I will research the AC_DET Opto and a few other TVs I have waiting troubleshooting.

Thank you guys for your knowledge and patience. I will report back soon.

[budm]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

What is your power supply board P/N? I can see that it is made by DELTA but I cannot read the P/N on the board.
Is this the one:
Sharp RDENCA369WJQZ (DPS-343AP A, 2950244303) Power Supply Unit.
http://www.shopjimmy.com/sharp-rdenc...upply-unit.htm

[budm]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

https://www.badcaps.net/forum/showth...ight=DPS-343AP

I think we need to have the Voltage read out of all the pin on the power supply board connector that goes to the main board.
Report them in this format but put the pin name first and follow by the reading.:
https://www.badcaps.net/forum/showpo...5&postcount=23

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

What is your power supply board P/N? I can see that it is made by DELTA but I cannot read the P/N on the board.
Is this the one:
Sharp RDENCA369WJQZ (DPS-343AP A, 2950244303) Power Supply Unit.
http://www.shopjimmy.com/sharp-rdenc...upply-unit.htm

Same PS. I'll get the list of readings tomorrow. This is promising!!

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

Sometimes, a little closer inspection goes a long way.

I took the PS off the panel and looked it over. I found a blown part.

Now, does anyone know what value is supposed to be there? I assume it was a smt cap.

I repaired an old Panasonic plasma PS with a small electrolytic cap a few years ago that is still in service. So, I assume that little cap is causing my loss of AC_DET voltage.

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

Well, I could not find a schematic with the cap value. The service manual only had the one for the main, key, and IR boards. So, I found an old board and borrowed an smt cap from that. The TV has been working great for 2 hours.

Until something else cooks, I want to thank you folks on here for helping me. Your knowledge and time are greatly appreciated!!

[freakaftr8]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

Good to hear!

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

This set has died again. Same blink code. 1 OPC, 2 PWR. -10V Det missing PS_ON

I can bypass the code using Vol+ and CH- to get a solid power led. Pressing power button does not startup the set.

Voltage on the PS where PS_ON should go high is already high at 2.8 VDC. Pressing the power button on the set does nothing to that voltage.

I assume something on the main is shorted causing PS_ON to stay high. Should I buy a main board?

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

I'm going to replace the 4 optos and see what happens.

[SolderMaster]

Re: Sharp LC-60E79U - 2 Green, 1 blink - 1 Green 1 blink

5 optos replaced, main replaced. Same error AC_Det line is dead. Time to install all the parts from the SJ repair kit.