LC-60E78UN No picture, backlight, no flashlight

[fcisolutions]

I have a Sharp LC-60E78UN and here's what I've done:

Had a bad power supply (no standby) and found a cheap one on ebay. Now with the good supply, I am getting blink codes OPC/Power one blink, Power two blinks and then it repeats the cycle.

The power supply tries to turn on before I get the blink codes. If I force the power supply on with a 1k resistor between pin 11 labeled BU5V on main ps connector and both the PS_ON and PNL_POW, I get good voltages but NO BACKLIGHT. Here are the voltages:

LA1
Pin 1-5 INV24V1 24.43
Pin 6-10 SGND3 0

LA2
Pin 1-5 INV24V1 24.43
Pin 6-10 SGND3 0

PD
Pin
1 S14.3V - 14.34
2 S14.3V - 14.34
3 UR14.3V - 14.34
4 UR14.3V - 14.34
5 SGND5 - 0
6 SGND5 - 0
7 SGND - 0
8 SGND - 0
9 AC_DET - 3.2
10 PS_ON - 4.6
11 BU5V - 5.03
12 PNL_POW - 4.6

PL
1 PNL12V - 11.99
2 PNL12V - 11.99
3 SGND - 0
4 SGND - 0

I checked the transformers on the inverters. All are 6.3k +/- 2%.

So I'm leaning towards the main but don't have the schematics.

On a side note, is anyone else having a problem searching the forums posts? I will search for a part or tv model and I get way more results than I used to. Maybe I have a setting wrong of something.

[dskall]

Re: LC-60E78UN No picture, backlight, no flashlight

What are you getting on pin 10 and 12 when you power it on

[fcisolutions]

Re: LC-60E78UN No picture, backlight, no flashlight

Pin 10 -- 2.86v
Pin 12 -- when the relays click, it hits .4-.8 and
then fades to .15 even both in normal condition
and with the t-con disconnected

[attainteddragon]

Re: LC-60E78UN No picture, backlight, no flashlight

i'm not saying that you don't have an issue with your main board, but if you jumped your ps on and you had all voltages present, but no back lights, then you will have an inverter fault. there should be a fuse on the inverter board just near the connector. check it to see if it is open.

[budm]

Re: LC-60E78UN No picture, backlight, no flashlight

"12 PNL_POW - 4.6" That is not for the Backlights on/off, it is for switched 12v for running the T-CON board.
The BL-ON and Dimming signals are not routed through the power supply, it is connected directly to the left inverter board directly from the main board, you can see a connector on the main board with only 2 or 3 gray wires on that connector that goes to the Inverter board.
BTW, we need good clear pictures of the inverter boards, especially around the connector. There should be some fuses on the inverter boards too. Did you already check those connectors that link the inverter boards together?

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

A friend of mine just got this exact TV, and it's doing the exact same thing...power and opc lights blink once (together), then the power blinks once...repeat. I too am having trouble finding the error codes online (really hope someone would post them). I could really use some guidance as to where to concentrate on finding the problem. I did notice the date on the last post, but am still hopeful. Thanks.

[budm]

Re: LC-60E78UN No picture, backlight, no flashlight

Service manual:
https://elektrotanya.com/sharp_lc-60e78un_[a].pdf/download.html
wait for 'get manual' to come up.

[nomoresonys]

Re: LC-60E78UN No picture, backlight, no flashlight

Did not understand your blink code, what exactly is it doing blink wise, upon plug in and or upon power on attempt?

[nomoresonys]

Re: LC-60E78UN No picture, backlight, no flashlight

Unplug the television.
Press and hold the "Channel Down" and "Input" buttons on the panel.
Plug the television back in while holding down these buttons. ...
Keep holding the buttons until the television powers back on. ...
Use the remote to navigate the "Service Mode" menu and select "Factory Reset" from the menu, see if that solves it.

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

When it gets plugged-in, the power light comes on...then there's a click the power light goes out...the power and opc light blink once at the same time...the power light blinks one time (by itself)...the pattern repeats itself...

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

Already tried that, the TV will NOT light up. The blinking light pattern (described above) starts back up.

[nomoresonys]

Re: LC-60E78UN No picture, backlight, no flashlight

Check service manual post #7.

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

Check service manual post #7.

What post number 7???

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

Does anyone actually just have what each of the blink codes mean??? If yes, could that person PLEASE u/l???

Thanks

[budm]

Re: LC-60E78UN No picture, backlight, no flashlight

My post #7 has the link to download the service manual.

[nomoresonys]

Re: LC-60E78UN No picture, backlight, no flashlight

Tv repair can't be learned in an hour, directions have to be followed in exact order. Plus your highjacking this thread, START your own thread and try using proper manners, I probably know what it needs but I'M OUT. Just a few too many ?????? for my taste. We do this to help people nobody is getting paid, so no manners = no help.

[budm]

Re: LC-60E78UN No picture, backlight, no flashlight

Sharp LC-*E series error codes.
https://www.badcaps.net/forum/showpo...&postcount=373

https://www.badcaps.net/forum/showth...196#post824196

[GraphXmaN]

Re: LC-60E78UN No picture, backlight, no flashlight

Tv repair can't be learned in an hour, directions have to be followed in exact order. Plus your highjacking this thread, START your own thread and try using proper manners, I probably know what it needs but I'M OUT. Just a few too many ?????? for my taste. We do this to help people nobody is getting paid, so no manners = no help.

I wasn't out to piss anyone off first of all, and secondly, at the time, I wasn't allowed to post a new thread (so, talk about manners).

Yes I know TV repair can't be learned in an hour and that nobody's getting paid anything (there's no need to point that out cause that's very obvious when you join up...this is a help community where everyone talks to everyone in a languane that is understanderstandable...one might know computer language while the other doesn't, one might know TV Sch??? codes, but another doesn't...so you've got to break it down to a level that is understandable for everyone, and if that's being rude (or having no manners), then respectfully you are in the wrong type of community help area.), I also know that time isn't always freely available either...all that being said, I'm just trying to get a better understanding of the the darn Service manual is telling me (which isn't very much to start with). So, sorry for lack of manners, but being straight to the point verbally with "what" the problem is, is VERY important for me to get out...that way, those that take the time to read & help can have as much info as possible.

As for the Service manual in Post #7, I've already d/l it as well as the one for the LC-60E77UN that was also posted online.

[nomoresonys]

Re: LC-60E78UN No picture, backlight, no flashlight

Debates aren't allowed on this site or we would have one, so I'll just put you on ignore, good luck chuck

[kemmnok]

Re: LC-60E78UN No picture, backlight, no flashlight

A friend of mine just got this exact TV, and it's doing the exact same thing...power and opc lights blink once (together), then the power blinks once...repeat. I too am having trouble finding the error codes online (really hope someone would post them). I could really use some guidance as to where to concentrate on finding the problem. I did notice the date on the last post, but am still hopeful. Thanks.

It's really hard to find problems as a noob. If I/we don't know about internal parts properly then we only can do power, wire, switch etc basic job for testing purpose. Otherwise, you need to go mechanic to solve this problem.