Sharp Aquos LC-60LE600U no power period

[budm]

Re: Sharp Aquos LC-60LE600U no power period

R7816 is the current sensing resistor connected to the Source pin of the PFC MOSFET, when MOSFET shorted out it will blow that Source resistor, it is 0.56 Ohm Flame proof type resistor, you can use MOX (Metal Oxide) power resistor.

[Adubey]

Re: Sharp Aquos LC-60LE600U no power period

Thanks for the superfast response BUDM. Do you know the value of R7816? Looks like owner replaced (or got it replaced) the resistor. Currently it has a 6.8 ohm resistor. Not sure if thats the right value.

If that PFC MOSFET is blown, more likely the components connected to the Gate and the PFC IC are likely to be damaged also.
You should attach the pictures of the board?
What is the P/N of the power supply board?
Sharp RUNTKB057WJQZ (DPS-168JP A)??? yes its DPS-168JP A
MOV Z7001 is blown? 150V rating MOV with about the same Dia, will be fine.
What is the history of the TV? Hit by power surge? I got it from Craigslist hence no information on history.

Pictures provided by shopjimmy.[/QUOTE]

[budm]

Re: Sharp Aquos LC-60LE600U no power period

There should be part number printed on the Bridge and the Q7801 (PFC MOSFET).
If that PFC MOSFET is blown, more likely the components connected to the Gate and the PFC IC are likely to be damaged also.
You should attach the pictures of the board?
What is the P/N of the power supply board?
Sharp RUNTKB057WJQZ (DPS-168JP A)???
MOV Z7001 is blown? 150V rating MOV with about the same Dia, will be fine.
What is the history of the TV? Hit by power surge?

Pictures provided by shopjimmy.

[Adubey]

Re: Sharp Aquos LC-60LE600U no power period

Hi All, I have a LC-60LE600U with blown fuse. I did quick check and looks like its rectifier is fried. Hence I am looking for actual part numbers for the Bridge rectifier, the Q7801 and R7816. Does anyone have schematics?

Thanks in advance for your help!!

Just checked even the variastor is blown but its number is visible so I can get a replacement for it.

[Adubey]

Re: Sharp Aquos LC-60LE600U no power period

Hi All, I have a LC-60LE600U with blown fuse. I did quick check and looks like its rectifier is fried. Hence I am looking for actual part numbers for the Bridge rectifier, the Q7801 and R7816. Does anyone have schematics?

Thanks in advance for your help!!

[Kottonmouth]

Re: Sharp Aquos LC-60LE600U no power period

Having same issue no power at pin 1-2 any ever resolved this issue. My house was struck by lighting

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

I'm going to go through it again I think I tried all that- how did you make out on yours with the LED issue?

[bartstop]

Re: Sharp Aquos LC-60LE600U no power period

I think the reset procedure is to hold down input and vol- at the same time you plug it in.

[budm]

Re: Sharp Aquos LC-60LE600U no power period

Another thread to follow:
https://www.badcaps.net/forum/showth...982#post722982

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

Thanks bud I will try to check the key button controller, and are there any key components on the main board I should check since there is an issue? How are you making out with the LC-70LE757U? if you need and readings etc. we could take mine off the mount to help you out- let me know

[budm]

Re: Sharp Aquos LC-60LE600U no power period

I did some searching in BC, it looks like the ERROR should be high. Looking through the PDF in the link, it looks to be that the ERROR pin is for the Backlight Error.
https://www.badcaps.net/forum/showth...rp%22+%22pd%22

https://www.badcaps.net/forum/showpo...92&postcount=1

[budm]

Re: Sharp Aquos LC-60LE600U no power period

Pin 22 ERROR = 0.95V
The problem right now is that we do not know what the value of this Voltahe should be for the main board to think that it is normal, this error signal may be keeping the TV from sending the control signals, I cannot find much info form most of the Sharp TV service manual to tell me what the normal condition should be.
Need to do more research or if someone has working board can take the reading for us to verify.

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

You think the key control board? there must be a diagram for checking somewhere

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

Here the main

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

Hi yes unplugging and holding power, plug in hit power again or vol and chan down while replugging does nothing. when I saw the key controller is plugged into the main board I figured that might be smoked worse then the power supply- is there some method of testing the main?

[dskall]

Re: Sharp Aquos LC-60LE600U no power period

tjmethod says pushing power button does nothing. Maybe problem with power to buttons and led on front? I have quick question for you budm if I might and don't want to hijack tread. You say pfc should be >360v if it is 357v will that cause a problem?

[budm]

Re: Sharp Aquos LC-60LE600U no power period

I expect error codes since the standby power supply is present, other wise it means the main board is dead due to what I do not know.

[dskall]

Re: Sharp Aquos LC-60LE600U no power period

budm on post #3 he says there are no lights. Seems like he should be getting blink code.

[budm]

Re: Sharp Aquos LC-60LE600U no power period

BTW, did you see any blinking error codes at all?
For example:
https://www.badcaps.net/forum/showth...&highlight=STB

Pin 16 PNL_POW = 0.05V = No command to turn on PNL12V for running the T-CON
Pin 24 STB (Von) = 0.58V = No BL-ON to turn on backlights circuit

No dimming control:
Pin 17 PWM1 = 0.16V
Pin 19 DIMMER = -0.00V

The key is this one which I do not what it should be for normal operation:
Pin 22 ERROR = 0.95V

[tjmethod]

Re: Sharp Aquos LC-60LE600U no power period

With Magnavisors on I didn't even see that 1 & 2 tucked in there- in post 7 I thought you were making reference to (PD-1-2) PNL12V since it was at the top of the PD. Anyway, I hope this makes better sense. Also while I back probed all the pins, I tried hitting the power button which did nothing-

Pin 1 PNL12V = 0.00V
Pin 2 PNL12V = 0.00V
Pin 3 GND = -0.00V
Pin 4 GND = -0.00V
Pin 5 UR13.2V = 13.15V
Pin 6 UR13.2V = 13.15V
Pin 7
Pin 8
Pin 9 GND = -0.00V
Pin 10 GND = -0.00V
Pin 11
Pin 12
Pin 13 AC_DET = 3.28V
Pin 14 PS_ON = 2.07V
Pin 15 BU5V = 5.01V
Pin 16 PNL_POW = 0.05V
Pin 17 PWM1 = 0.16V
Pin 18
Pin 19 DIMMER = -0.00V
Pin 20
Pin 21
Pin 22 ERROR = 0.95V
Pin 23
Pin 24 STB = 0.58V