Re: Sharp LC-70C8570U
OK I get PE to the BD81000 and that should send VCC 1.2v to Primrose.
the VCC Voltages on Primrose should be ====>>>
3.3V
2.5V
1.5V
1.2V <=== missing, I assume this means Primrose will not out any PWM signals ie PWM1, PWM2, PWM3, and PWM4
lonewolf55
Member
Last Activity: 01-28-2019, 01:35 PM
Joined: 01-01-2019
Location: Texas
-
Re: Sharp LC-70C8570U
as I've stated earlier I suspect the Panel is probably bad BUT without connecting the Panel everyone tells me I should still get Backlights ... so I have been going on this assumption.Leave a comment:
-
Re: Sharp LC-70C8570U
I specified it back in post #67
and yes I know many others read here, for Sony and vizio ... I probably should have started a new Thread to begin with instead of just adding to this one as the OP's posted Model number dosen't even exist as far as I could see, but I thought he maybe just mis posted his model number
But it seemed like a good place to start
...
Leave a comment:
-
Re: Sharp LC-70C8570U
I watched that video some time back too
I did not see mention of the LC70LE847U on that video and the T-CON he shows is very different from the one I'm messing with.
F961FM01 T-CON here as mentioned earlierLeave a comment:
-
Re: Sharp LC-70C8570U
yes I connected it without the 4 Flat cables, they still have not been connected by me, as I still have no PWM1 signal from the TCON.
yes I have read about the Sharp is supposed to shut down unlike vizio
where is this shut down detected ?
And IF shutdown happens should I not get an Error code on the Power LED ? like 25
I can force the 25 error by disconnecting the 4 pin 12volt cable from the T-CON or I can force it by disconnecting the LVDS cable.
Basically the Results were, I started testing...Last edited by lonewolf55; 01-08-2019, 02:16 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
First off the Panel cannot damage a TCON if the 4 Ribbon cables are not connected between the TCON and the Panel.
The new USED TCON that I installed was not connected to the Panel and I discovered NO Backlight so I went looking and found the mentioned transistors bad.
This is not to say there is not more wrong with the new used TCON, I never dug any deeper after finding the bad transistors.Last edited by lonewolf55; 01-08-2019, 01:45 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
I wish, but looks like these are the Common Fail Items.
What I have discovered is:
Q6211 PN AO4629
Q6208 PN 2SD1664Q
Q6209 PN 2SB1132Q
D6207 & D6210 PN RB552EA
and 1 other common Transistor LTC044TEB <<== this was a Bitch to source best I can do is the MMDTC044TE
Here is the Datasheet and source for it [url]https://cdn.badcaps-static.com/pdfs/8ce48db082e48f686b3e859b06e0e51d.pdf[/url]
Hopefully none of the Major IC's are toast.
Right now I'm trying...Last edited by lonewolf55; 01-07-2019, 11:21 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
well, Brand new Used T-CON arrived today and is Dead
transistor Q6208/Q6209 are bad, sourcing parts to repair the T-CON will leave me waiting for at least 6 weeksLeave a comment:
-
Re: Sharp LC-70C8570U
and here is what Sucks PWM1 is the GPO0 pin on the LR388H5 IC so in fact it is not being powered as that pin has 0 voltage
it's taking awhile but I'm getting a good understanding of how this board really works and VGH is gate drive to that LR388H5 also.
the attachment is just a tidbit on the LR388H5 specs, I couldn't find a full Datasheet to inspect....Last edited by lonewolf55; 01-05-2019, 01:22 AM.Leave a comment:
-
Re: Sharp LC-70C8570U
OK I found the Issue VGH 35v is failed no voltage on the T-CON
I have full Schematic of the F961FM01 board now
OK attached is the Area of the Failure.. I've yet to nail down exact components yet, but good chance this could be caused by Bad Panel.
Maybe it will help someone else.
...
Last edited by lonewolf55; 01-04-2019, 06:12 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
the outside connectors are 80 Pin and go to the LR388H5 IC I believe these are what you call the FFC cables and the other 2 Cables are 64 pin and these are Control Cables <<== my best Guess.
anyway no matter if T-con cables are connected or what order of disconnect, there is no Picture information to be seen not even OSD Menu, even when forcing the backlight on.
The screen will just be Black or White.Last edited by lonewolf55; 01-04-2019, 03:23 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
this set has 6 LED strips 3 on top 3 on Bottom, the Backlight inverters on the PSU do not turn on until you have PWM1.
the real issue is that for some reason the T-CON is not producing PWM1 Sorry if I sounded confusing.Last edited by lonewolf55; 01-04-2019, 02:48 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
No is not different than I reported, you could not tell this Until I forced the back lights on, with no Backlights you cannot tell any difference when cables are connected or Disconnected.
Also with no Back lights, it makes no difference with what cables you disconnect, you cannot tell the difference....Last edited by lonewolf55; 01-04-2019, 02:51 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
I can get the Screen to be Black or white on either side by the usual removing one side of the Ribbon Cables from the T-CON but this is not really proving too much as there is still no Video present (and no Snow) but this could be due to loss of a voltage on the T-CON or it could be still an issue on the main Board, I'm still not sure what should be present on the OFL and DIMMER <== I'm not worried about that just yet as I do know that PWM1 is not Present and this is a sure sign of something going on with the T-CON.
The Bottom Line is I need...Last edited by lonewolf55; 01-04-2019, 01:50 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
the thing is I know you may be very Correct as in the Beginning I suspect it is a Panel Issue, it's possible that it can Blow Tcons as fast as you can replace them. My guess is that I have a Power Source on the T-CON that is bad right now, but this could just be the Tip of the Iceberg.
I do see buck/boost circuits on the T-CON Board, but right now I'm still trying to Identify Test Points to figure out WTF to test.
I have Identified the Vcom power Transistors on my T-CON and several other areas, I sure wish I had a Block Diagram...Leave a comment:
-
Re: Sharp LC-70C8570U
ok the signals that I question in Post #64 come from VCOM Calibrator on the T-CON, so it seems that I have found the area of my Problem.
Here is basic pinout of the 41 Pin LVDS connector called LW how Fitting LoneWolf...
Leave a comment:
-
Re: Sharp LC-70C8570U
Right on the PWM to me it means Pulse Width Modulation .. I use PWM a lot with Stepper Drivers and in CNC etc etc while a steady state won't show you still can see the needle of the meter move when you have a signal and the Voltage will "Appear" to vary ....... now on a Digital Meter maybe you will see Voltage depending on the Duty Cycle of the PWM Signal, while it's not the best way to look at a PWM signal it is a down and dirty way to see if it is there or not
Thanx for all the help, just talking thru the issue helps and having other input makes...
Leave a comment:
-
Re: Sharp LC-70C8570U
These are my PD voltage readings on the PSU Board.
Thanx for the Reply, I'll look at the voltages on the Panel, But yes I will need to do a bunch of disassembly to get at it and right this moment I don't have a free Bed to lay it on until the Wife allows it LMAO
I still think the T-CON alone should give me PWM1 without the Ribbons connected, 4 Service Shops in the area have verified this, and several PEW-TUBE videos seem to claim this too. So I think I need to figure that out before digging into the Panel, I messaged Sharp several...Last edited by lonewolf55; 01-03-2019, 04:23 PM.Leave a comment:
-
Re: Sharp LC-70C8570U
OK I have the Correct SM now.
This is the Correct Block Diagram and the SM for any that want it.
The other Block Diagram that I posted earlier is still Valid as a Guide....Leave a comment:
-
Re: Sharp LC-70C8570U
PWM1 is a straight shot thru the Main Board From the LVDS connector straight to the PD connector.
there is continuity from Pin 5 of the LVDS thru pin 17 on the Main board PD connector all the way to pin 17 on the PD connector of the Power Board, PWM1 is for sure generated by the T-CON and no components on the Main Board control it.
in my last post you can see the black wire hanging down connected to a Meter lead, that is the wire that goes to Pin 17 of the PSU PD connector (PWM1), you can see a small jumper wire that I used from Pin...Last edited by lonewolf55; 01-03-2019, 01:02 PM.Leave a comment:
No activity results to display
Leave a comment: