e701i-a3 no picture but backlights
Collapse
X
-
Re: e701i-a3 no picture but backlights
You also need to double check the cabling leaving the tcon to the panel, especially the one going to the same side as the vertical lines. If the cabling is OK (clean the bare cable "pin" surface with some alcohol), and the vertical lines still remain, try another board. From my experience, when a tcon cable is not connected, and one "brushes" their finger lightly across the corresponding tab cables at the bottom of the screen on that side, you can cause those vertical lines to readily happen. So it more than likely you have some form of "open" connectivity on that side or broken tcon card.
If fact, if you do the "remove tcon cable" test (one cable connected, other removed) on the other side, the same vertical lines will appear.Comment
-
Re: e701i-a3 no picture but backlights
So bud you mean check the cables going down from the t-con? So disconnect all connections,wipe with alcohol, then reconnect- I assume you mean bottom boards and right side LCD drivers? Then do the t-con test…Comment
-
Re: e701i-a3 no picture but backlights
yes those cables especially since you have been taking them on and off alot between swapping cards in and out.
As for side... from the "V" picture, it is the left side of the screen, looking from the front, then on the back side, the right side cable.
Further, I would bring up the menu screen to help with looking at something that you would expect to see along with the fact that text stuff is easy to quickly determine whether things are good or bad.
You can take turns connecting and disconnecting one of the 2 tcon cables (ie. one for each side of the screen) with power off during the disconnect / connecting and look at the screen for changes.
I suspect that you have a tcon issue currently / still.Last edited by budwich; 10-23-2015, 09:48 AM.Comment
-
Re: e701i-a3 no picture but backlights
Right. Like we cleared one problem but now we have to look at the next
Don't touch the right side tab drivers. The more you move them the more chance it have a break in connection. The only thing you need to check is replacing the t-con board to start see if the picture changes. We'll go from there.Last edited by freakaftr8; 10-23-2015, 10:13 AM.Did I leave the soldering iron on?Comment
-
Re: e701i-a3 no picture but backlights
Right. Like we cleared one problem but now we have to look at the next
Don't touch the right side tab drivers. The more you move them the more chance it have a break in connection. The only thing you need to check is replacing the t-con board to start see if the picture changes. We'll go from there.Comment
-
-
Re: e701i-a3 no picture but backlights
Awesome man congrats! Another "operation " completed. 2nd vizio I know of besides mine now.
Your audio problem is probably a processor ic problem on the mainboard. Did you have audio before?Did I leave the soldering iron on?Comment
-
Re: e701i-a3 no picture but backlights
Ya it looks good… funny thing on the audio- the main board works perfect in the 60- I recently put it (original main board) back in the 70 so I'm perpelxed as to what it could be. I did check the settings- reset audio etc. differeent settings- nothingComment
-
Re: e701i-a3 no picture but backlights
This main board is the main board the tv came with- it worked perfectly in a 60- I just recently put it back into the 70Comment
-
Re: e701i-a3 no picture but backlights
Yep same model. That's How I figured out what to do. Right when budwich was trying to figure out what's going on with his sharp and Tom66 brought up the side drivers I was already into this at the time. Just so happened I ran across that thread at the same time I saw what was going on.
I started the operation on mine dice I figured I hadn't had nothing to lose since it was a freebie. I saw the white line across mine and realized that what I was seeing was the whole picture across. Lots of trial and error to get to this point.Last edited by freakaftr8; 10-23-2015, 11:35 PM.Did I leave the soldering iron on?Comment
-
Re: e701i-a3 no picture but backlights
You need to try different cables, different input ports. Audio on hdmi is carried on a different pin (I think)... so you can have picture and no audio but the decoding is reliant on the protection bits being properly "computed" (ie. hdcp stuff). Further, if you have an over the air antenna feed, that would be best to check things out further.
My guess is you have some bad pins maybe on the port. My sharp set's hdmi ports were "weak" as there is no strain relief provide by the set and the owner's cables were heavy and stressed the ports.
Further try some analog rca's to see if they work.... and go from there.Comment
-
Re: e701i-a3 no picture but backlights
You know I did forgot the unplug the chromecast dongle into the HDMI 2 port and when I went to lay the tv down again on the base I made to remove the stand, it popped out the plug from the wall so now it could be the HDMI port on the main board- I didn't try another and this was the only source I tried last night so it could also be now the cord on the chromecast dongle. I'll scope it out I'm sure it's an easy fix. Those transistors were key since the the COAXA didn't hold up to the to testing. Anyaay, thanks for your help- if you need any of the transistors let me know I'll send you some I have plenty- I couldn't find them searching online but in China but once talking to an electronics module company on the phone- they found them by model number- Mouser in Texas…Comment
-
Re: e701i-a3 no picture but backlights
This is why HDMI cables that claim improved audio must be bullshit, because how would they only improve the audio channel?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: e701i-a3 no picture but backlights
HDMI audio is carried in the blanking interval on the video frame. It's effectively interleaved with the video data and transmitted on the video TMDS pairs.
This is why HDMI cables that claim improved audio must be bullshit, because how would they only improve the audio channel?Comment
-
Re: e701i-a3 no picture but backlights
Budwich had the sharp. I have the vizio. Another member just fixes his Sharp 70 the same way. That makes 4 of us confirmed all still working AFAIK.
Mines been running the longest. Budwich second longest. Almost a month. Still perfect.Did I leave the soldering iron on?Comment
-
Re: e701i-a3 no picture but backlights
Hi All,
So, I got a Vizio E701i-A3 off of Craigslist knowing it had no Video but had sound. The guy had just put in a brand new tcon board and fired the TV up for me. Not knowing that doing this would blow the transistor on the tcon board until I got home and ran across this thread. So now I have two non functional tcon boards. :P
So using my DMM, I measured the ohms on the transistor, tcon board 1: one was barely 300 ohms, the other side was 2.2ohms. tcon board 2 measured 2.8ohms, and the other pin 2.1 ohms. From reading this thread, pretty sure both of these transistors are toast. Will order the transistors today that were referenced by Freak.
Once I get the new transistors, will try the test method as outlined by Freak. Cross your fingers and wish me luck that I can get similar results of success on getting this beast to work.Last edited by Mayhem56; 10-26-2015, 05:17 PM.Comment
-
Re: e701i-a3 no picture but backlights
Way to go I started a trend! Lol. Keep us updated. These TVs are too nice to scrap.Did I leave the soldering iron on?Comment
Related Topics
Collapse
-
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?by Tynan DillI was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming...7 Photos -
by m1ch43lzmHi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
by howardc64Problem
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....-
Channel: Troubleshooting Computer Displays
-
-
by maxim2511My Oled Tv is 55inch tv, 3 days ago I notice that middle of the screen is getting warmer and on picture I have ghosting, missing red color. Color red was still displaying, but it was not so strong as corners of the screen and watching some movies makes me angry.
Then I get an idea to take it apart and clean boards from dust.
In side of Tv was not so bad, I take compressed air in can, and gently blow up.
Also I was thinking to styrofoam sponge to isolate power board from screen that the middle of the screen will not worm so much. Because Led on screen when gets higher... -
Hi,
I have a VIZIO E70-E3.
Symptoms: Black screen, no picture, but LED backlights are working.
I probed the power board and voltages are as listed on the board.
Main board appears fine, too.
I believe the problem is either a bad T-CON board, or connection to LCD, or bad LCD.
There are two separate ribbon cables feeding the LCD.
If both are connected, the screen is black.
If only the ribbon cable that feeds the right side of the screen (when viewed from the front) is disconnected, the left side of the screen shows picture and... - Loading...
- No more items.
Comment