Re: Sharp LC-70C8570U
In post #14
I have 3 regulators reading 0v
Could this be a problem also...
In post #14
I have 3 regulators reading 0v
Could this be a problem also...
-
-
Re: Sharp LC-70C8570U
Also i want to add PW1 and PW2 comes from t-con board
And they read .7v PW1 and 0 PW2Comment
-
Re: Sharp LC-70C8570U
And I'm assuming you tried powering up with all 4 pulled as Well? If so, steady power light but no backlights?Did I leave the soldering iron on?Comment
-
Re: Sharp LC-70C8570U
Since you are "playing" with the set, why don't you try the "standard... disconnect the corner cable test" with the tcon to panel cables all connected to see what happens. Also try it from the other corner. You have nothing to loose and it might help with the "diagnosis"... maybe.Comment
-
Re: Sharp LC-70C8570U
probably nothing but I am having a hard time following what you have done and when. A number of these type of sets have panel issues which "manifest" themselves as 2-5 type problems because of their impact on powering and the limited "code design for errors". Further, depending on the failure, the system shuts down powering accordingly (sometimes fast). Anyways, unless you have something better, it was just a suggestion. I know when I was "playing" with my 70in, it took quite a bit of "playing" before I got anywhere as a comments of "panel problem" was "popular". :-)
Plus... I don't understand "the pw1,pw2 to power supply... come from the tcon to the power supply...." when are you reading / monitoring these? at power up, once code flashing occurs, before code flashing occurs????? Again, reading back your "steps"... sometimes you have 12v and then other times you have 0v.... this tells me that the "process" isn't quite set for consistency. But again just my "eyes" from the internet.Last edited by budwich; 12-04-2017, 03:57 PM.Comment
-
Re: Sharp LC-70C8570U
OK judging that you see 83 volts at each output to the LED drivers And 12 votes going to the tcon tells me that the power filter correction circuit of the power supply has to be going high. Interesting fact that you mention you're getting 83 v to LED drivers. If they were disconnected out of circuit the backlight controller does not allow power to backlights. (Or an open backlight output channel for that reason as well)
And without an actual service manual I would not be open to tell if 83 volts to each channel output is optimal for the backlights to light up. To me that sounds a bit low.
However if you can connect one side of the panel to the point were you do not see the error Flash in the power light stays consistent Look into the screen with a flashlight and see if it has an image without the backlights being litLast edited by freakaftr8; 12-04-2017, 04:14 PM.Did I leave the soldering iron on?Comment
-
Re: Sharp LC-70C8570U
Also I might add that if the panel had indeed failed, Removing the short by disconnecting the shorted side of the LCD panel via the to right or left ribbons, The tcon May already be damaged to the point where it does not allow power supply spool up of led's, When you notice that the 2-5 error goes away by disconnecting the offending side, If you do not have a picture with the flashlight test You could check the inductors on the tcon to see if you're getting other voltages besides just 12 V with the power light on solid.Did I leave the soldering iron on?Comment
-
Re: Sharp LC-70C8570U
Sorry pwm1 and pwm2 from tcon board to powersupplyComment
-
-
Re: Sharp LC-70C8570U
ok... but again, what is the history of the set? and again, you didn't address the questions that freakaftr8 posted earlier.
potentially, it appears that there is "something" that has happened on the tcon but I wouldn't necessarily say "heating"... more like "moisture marks".Comment
-
Re: Sharp LC-70C8570U
I dont know history of tv..
I just know it does not work when i got it from a friend.
I plugged it in and 2/5 fault code. I know this does not help. I have a new t con board coming in tomorrow but i dont think thats goin to help my panel issue. I appreciate your helpComment
-
Re: Sharp LC-70C8570U
OK. no problem with "unknown history"... that is better than "I won't answer". Again, you still have not answered the questions freakaftr8 asked that I also asked you to clarify.
Hopefully, your replacement tcon will get you there but at this point, I wouldn't necessarily hold my breath.Comment
-
Re: Sharp LC-70C8570U
look at my post 33... anyways best of luck with your card replacement.Comment
-
This happened last Saturday and today I finally had time this morning before I went to work to replace two non brand capacitors
I will let you be the judge weather or not these are bad or not according to the blue ESR meter that I am using
I am comparing them to a brand new one that I installed
The display came back on and the programming was not lost which I was surprised by I would have thought that when the display went blank that so did the memory as well
I going to let it run for several days before I remount back on the wall next to the... -
It's been a while since I've checked in here or needed input on narrowing down what to replace on a TV repair, but I've got one on my bench now that has me wondering. The lack of part (board) availability means I may need to do some component-level diagnostics, and a second opinion is always good when it comes to that.
The issue - Sharp LC-80LE844U does not display. Power light comes on for a while, then you can hear a relay click off and the light blinks twice slow, then five times fast. Service manual points to 'Panel Power Supply Error' with this code, but isn't much more help... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
So this laptop seems to have some kind of failure. I bought it second hand and originally the previous owner said that they went to turn it on and it was presented with a quick flash of the power light the keyboard lit up and then the keyboard shut off and the power light went off as well but the battery indicator was white and after about 5 to 7 Seconds flashes orange really quick then shuts off and goes back to White. If the power button is pressed again the keyboard lights up really quick and then repeats. When I got it I could press the power button multiple times the keyboard light would...
-
Hello Sharp TV experts
Our Sharp LC-80LE642U displays one short one long flash error code which is a backlight error. I went into service mode and there were 8 lamp error counts recorded. I reset the count to 0 and did a reset. The last monitor error cause was 16 B00014639:12. 16 is the code for backlight error. I tried to power the tv up but went back into error mode.
> I checked voltages on the power supply board and they all check out .. including 3.28 volts at the error pin.
> There is power to the cpu and T-CONN and no faults found there. The cpu has a flashing...01-24-2025, 11:51 PM
Comment