Sharp LC-60LE847U

[ljintexas]

Re: Sharp LC-60LE847U

Q7602 only has 250 volts..Q7801 shows 119 volts DC on center leg. I will retouch solder on xnsformer legs and all three devices on heat sink. then reinstall and check AC-DET pin to make sure I have >3 volts DC.

[ljintexas]

Re: Sharp LC-60LE847U

Will post results shortly after retouching.

[ljintexas]

Re: Sharp LC-60LE847U

Q7602 is now 204 volts, Q7601 is 404 volts, I do have the 404 volts at C7800 A &B. I have 3.3 volt steady on pin 13 which is AC-DET. 13 volts is steady now. No blinking lights.. Retouched all legs of xnsformer and FETs.
Still less than 1 volt to LED conductors. No LED voltage.. C7220 A&B have 82 volts across them. C7500 and C7501 have 82 volts as well across them. L7201 A&B have less than 1 volt on all legs to ground.

[budm]

Re: Sharp LC-60LE847U

It needs to receive BL-ON signal form the main board to turn on the backlights circuit.
BTW, you do have 12V_PNL now right?

[ljintexas]

Re: Sharp LC-60LE847U

Yes, I do have 12V_PNL steady now.

[ljintexas]

Re: Sharp LC-60LE847U

I do not see BL-ON labeled on smps anywhere..

[budm]

Re: Sharp LC-60LE847U

There are couple of pins on that board that I cannot figure out what they are.

[ljintexas]

Re: Sharp LC-60LE847U

Pnl-on?

[ljintexas]

Re: Sharp LC-60LE847U

Pnl_pow

[budm]

Re: Sharp LC-60LE847U

They are STB, and the OFL.
You will need to see if they change state between < 1V and >2V when TV is off and when power switch is activated.

[ljintexas]

Re: Sharp LC-60LE847U

Thank You Sir. I will check them early in the morning. Check them both to chassis for DC voltage <1 and >2?

[budm]

Re: Sharp LC-60LE847U

Thank You Sir. I will check them early in the morning. Check them both to chassis for DC voltage <1 and >2?

Yes, I believe they should toggle between those tow values when power switch is turned on and off.
BTW, there is no blinking code at all?

[ljintexas]

Re: Sharp LC-60LE847U

All blinking codes gone..steady 3.3 and 13 volts.

[ljintexas]

Re: Sharp LC-60LE847U

Bad connections on OFL and STB..I have backlight and picture..is this a T-con or possibly T-con cable issue?

[freakaftr8]

Re: Sharp LC-60LE847U

The moment of truth. Looks like a tcon problem. First try reseting all the cables on the tcon and reseat.the lvds cables too tcon side and mainboard side as well.

Did you bypass the fault? Sharp TVs like the shutdown in an instance of a fault. If you're bypassing the fault you're seeing the fault now

[ljintexas]

Re: Sharp LC-60LE847U

I have done as you recommended with no improvement. Chip in center of t-con gets very hot!

[freakaftr8]

Re: Sharp LC-60LE847U

I have done as you recommended with no improvement. Chip in center of t-con gets very hot!

The ic on the tcon is supposed to get very warm. This is normal to some degree. Hot though? There may be a short. Try a new tcon for starts. Your error code may be thrown by some load down of this board making the power supply go to shut down.

[ljintexas]

Re: Sharp LC-60LE847U

It gets downright HOT enough that you will not leave your finger on it for too long..I ordered a T-con today..

Thanks

[budm]

Re: Sharp LC-60LE847U

Bad connections on OFL and STB..I have backlight and picture..is this a T-con or possibly T-con cable issue?

So were they bad solder joints?

[ljintexas]

Re: Sharp LC-60LE847U

When I pushed my test lead extension wire into the nylon connector to be able to read the voltages of OFL and STB , evidently the pin inside the nylon housing for OFL were not making contact with the conductors on the board. However, I would say that the smps had many questionable solder joints that were high power which were retouched..many of them looked marginal at best. Once retouched, looked great.