I have a toshiba led tv that will turn on and have a backlight but no image. How can i test it to see if my tcon board is bad or if i have a bad main board.any input is appreciated thanks.
Attached Files
-
-
Re: Toshiba 47tl5154 no image just backlight
Here pic boardAttached Files -
-
Re: Toshiba 47tl5154 no image just backlight
Here pic power supplyAttached FilesComment
-
-
Re: Toshiba 47tl5154 no image just backlight
Tcon boardAttached FilesComment
-
-
Re: Toshiba 47tl5154 no image just backlight
Pretty easy to check with an oscilloscope the LVDS, while turning on and off the menu on the TV all the time.Comment
-
Re: Toshiba 47tl5154 no image just backlight
At least check and see if the main board is supplying the Voltage to run the T-CON.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: Toshiba 47tl5154 no image just backlight
I seen 12volts on the tcon fuse(budm)
I dont have a oscilloscope that is can go to 100mhz just one that can do 20mhz not high enough.In future i will purchase one for now i can only check voltages(capleaker)Comment
-
Re: Toshiba 47tl5154 no image just backlight
i replaced the tcon board still just getting backlight but no image on tv any ideas what to checkComment
-
Re: Toshiba 47tl5154 no image just backlight
If you didn't see any LVDS signal on scope,open the LED screen penal....... U will find water stain (on one or two green boards with tab connect to LCD screen) clean with tooth brush and acetone .One of my friend DID change resistor and fuse and fix the TV.
Most-likely you have is Toshiba 47TL515U LED TV and you definitely need is the Main Board 75023298. ......
Pls give us a feedback, if you fix the TV......Good luck......Last edited by Peter Chiu; 04-07-2015, 11:32 AM.Comment
-
Re: Toshiba 47tl5154 no image just backlight
The OP does not have the scope.
"I seen 12volts on the tcon fuse(budm)
I dont have a oscilloscope that is can go to 100mhz just one that can do 20mhz not high enough.In future i will purchase one for now i can only check voltages(capleaker)"Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: Toshiba 47tl5154 no image just backlight
My Mexican friend (Jose Perez) teach me, put LVDS cable on the tongue and you can feel the signal....... But don't try at home ........
Next project 1: I will make LVDS tester in the future.
Next project 2: LVDS to VGA converter ,LVDS signal on your computer monitor.Last edited by Peter Chiu; 04-07-2015, 12:04 PM.Comment
-
Re: Toshiba 47tl5154 no image just backlight
[QUOTE=Peter Chiu;547915]My Mexican friend (Jose Perez) teach me, put LVDS cable on the tongue and you can feel the signal....... But don't try at home ........
QUOTE]
I am guessing that's how your friend checks the main filter cap on the power supply to see if the PFC is working or not...
Comment
-
Re: Toshiba 47tl5154 no image just backlight
He must have very sensitive tongue to detect 350mV! or just B.S.
From SONY T-CON info:
The LVDS transmitter contains a circuit to serialize the parallel data. The parallel video information along with
sync and clocking data are transmitted via twisted line pairs. Depending on the logic level, current is sent along
one or the other of the twisted pair of wires. The receiving end of the wires is loaded with a resistor (usually
around 100 to 120 ohms). The receiver detects the polarity of the voltage drop across the resistor to determine
the logic level. The current level swings in the wire are about 3ma with a voltage differential of around 350mv.
This allows for transmission of the video signal with minimal EMI.
"Next project 2: LVDS to VGA converter ,LVDS signal on your computer monitor."
http://www.ebay.com/itm/like/2213100...lpid=82&chn=psLast edited by budm; 04-07-2015, 04:45 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: Toshiba 47tl5154 no image just backlight
I also heard people says {My father used have a TV repair shop , he fix TV with screw driver.}........more than one people said that ...........(CRT TV has 30 kV )....This is a murder.....
I could never understand........
Last edited by Peter Chiu; 04-07-2015, 05:41 PM.Comment
-
Re: Toshiba 47tl5154 no image just backlight
I have replaced the main board ,and tcon board still same problem no image just backlight.any ideasComment
-
Re: Toshiba 47tl5154 no image just backlight
bad panel?Comment
-
Re: Toshiba 47tl5154 no image just backlight
If you remove one ribbon from the tcon do you get anything?
Then reverse the process.Comment
-
Re: Toshiba 47tl5154 no image just backlight
I will try itComment
-
Re: Toshiba 47tl5154 no image just backlight
Ok discounted the right side the left was dark no backlight the right had back light then disconnected the left side had back light all the tv and could see some line on right sideComment
-
Re: Toshiba 47tl5154 no image just backlight
Is that model number correct? 47tl5154
I can't find a thing about it. So recheck. I see that there is another ribbon cable between the inverter and the t-con.Last edited by CapLeaker; 09-16-2015, 03:15 PM.Comment
-
Dears, this is my first post here and first try to fix my own laptop Apple MacBook Pro Retina 15-inch Mid 2015.
I have some general electronics troubleshooting experience and still as my hoppy but this is my first laptop trying to fix.
History: my laptop backlight stopped working without any reason.
Symptoms:
I have image on screen using my flashlight.
I have fully working laptop with the help of my external SAMSUNG LED tv via HDMI cable.
Keyboard backlight still working and can be adjusted normally.
Since two days I tried to follow all similar... -
This chinese all in one computer gives an image when connected to an external vga monitor but only the backlight with integrated monitor (no image). Initially I thought it was an edid problem on the eeprom of the screen but then I saw that the monitor works correctly with another identical motherboard (model th410-d4, read by bios). Unfortunately the motherboard is chinese and has no brand or codes on the pcb. The format seems ITX. Nothing can be found online. The official yashi site provides drivers but not the bios. The electrical diagram is obviously unobtainable
The board is equipped...01-16-2025, 03:54 AM -
Hi all
I have a Macbook Pro A2442 with the 820-02098 from a friend which has no picture on the display, however, the backlight works.
He was streaming a football match on a questionable site, then the site crashed, and the problem emerged.
Initially, he sent it to apple, who quoted him £1323.95 to replace the display, lid angle sensor and top case.
Obviously, he decided against this and gave it to me so that I could have a crack at it.
From initial diagnostics, I connected to an external monitor, I first tried with a HP 22W monitor, and I booted into the boot menu... -
Hi everyone!
First post on here so do tell me if i'm doing anything wrong. I have a laptop that came in with a broken hinge, but a healthy LCD. We replaced the LCD rear cover and now we do not get an image on the LCD anymore, though we get one via HDMI. There is sadly no schematic or boardview available for this motherboard (Bucks U42 DIS 17817-1) as far as i can tell, but I was able to identify which of the important pins on the LCD eDP connector (30 pin 2 lane) correspond to which pins on the motherboard display connector (which is 40pin, 30 for LCD and 10 for camera/face rec etc)... -
Hello Community!
CASE DETAILS
Promblem Signs: Backlight on 1 sec off 7sec > repeat && Red standby light: 1blink, off 3 sec, 2 blinks, off 5 secs, 2 blinks, off 3 sec, restart cycle
13V present on powerboard output. Backlight continues flashing after removing cables to pannel one at a time and even with both disconnected. NOTE: backlight STOPs flashing and remains on when connector between powerboard and mainboard (note Tcon built in) is disconnected.
Tried inserting firmware on USB and left it in for a few hours, but no change
...
Comment