Sound works and screen is illuminated the back light but no picture.
The blink code when i turn on is 14 or 15 i think it is one of them im not sure
The blink code when i turn on is 14 or 15 i think it is one of them im not sure
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Re: Panasonic TX-48CX400B Only backlight no picture
Test connector from mainboard to powerboard on powerboard side with all boards hooked up, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description/name and condition both off and when you hit power on. So we can see all the voltages and what they are doing. example in second link below if needed. -
Re: Panasonic TX-48CX400B Only backlight no picture
So it was from top of tv way to bottom
11.98
0
0
0
1
0
TV ON
11
0
2.6
3.2
0
24.94
I'm not sure what you mean by pin numberAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by Fixing222; 08-04-2019, 06:10 PM.Comment
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Re: Panasonic TX-48CX400B Only backlight no picture
Ok, I see you have one of those vestel powerboards, a lot of them don't seem to have the voltages marked on them, I better let one of the vestel pros help you. We don't see to many of those on this side of the pond.Comment
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Re: Panasonic TX-48CX400B Only backlight no picture
Ok yeah it's not so pretty as others inside and not so easy hopefully incase it mattets to anyone I typed the board in and the part cn4 and got this
Image attaches
And the service manual/circuit diagram attachedAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by Fixing222; 08-05-2019, 01:12 AM.Comment
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Re: Panasonic TX-48CX400B Only backlight no picture
Please stop posting pictures inline. Press Go Advanced then use the paper clip icon.Comment
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Re: Panasonic TX-48CX400B Only backlight no picture
After changing T-von and mainbiard it was none of them so maybe powerboardComment
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Re: Panasonic TX-48CX400B Only backlight no picture
Did you already try having ribbon cable between LCD panel and the T-CON board connected one at a time to see what you will get on the screen?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
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Re: Panasonic TX-48CX400B Only backlight no picture
Sorry not had much time to open it up but just got round to it, same thing. That was a good idea so this rules out the two tab boards (Driver boards) attached to the LCD if no display or could it still cause no display or a short just wonderingLast edited by Fixing222; 08-11-2019, 05:24 PM.Comment
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Re: Panasonic TX-48CX400B Only backlight no picture
Checking Voltages on T-CON board test points will be next, I.E. VDD, VGH, VGL, etc.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
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Re: Panasonic TX-48CX400B Only backlight no picture
Only have VCC multiple times but will check all of those.Attached Filesif you find these attachements useful please consider making a small donation to the site
Comment
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, yes take up lots of space sorry
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this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
Hi all
While I have quite a decent background in electrical & electronic troubleshooting & repairs, this is my first time stripping down an LCD TV for repair.... I have inherited a 3yr old Panasonic LCD which has a picture, but it is quite dark (too dark to be watchable - but still quite easy to see; I didnt need a torch to see it).
I started by checking and trying to adjust all of the picture and backlighting levels, but that made little to no difference. I also did a factory reset.
From there I envisaged that the backlighting wasn't working, however... -
Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged...
Comment