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Re: Digihome (Vestel) LED Backlighting Problem
TV failed last week. Switch on, fine, but screen goes blank after a couple of minutes. Restarting the TV fixes the problem but it keeps recurring.
Sometimes the left half of the screen only goes dark and the right half stays bright, before the whole thing fails.
Dismantled TV, done lots of checking of LED bulbs, voltages at various different points, etc. but I'm struggling to make sense of it. Don't think LEDs are all faulty on one side of the screen (3 individual bulbs have failed on the other side of the screen but it doesn't stop the others working). Can't find any broken connections - everything seems intact.Attached FilesLast edited by bigalxyz; 08-21-2016, 11:41 AM.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
In that pic, one led is out on the very top left.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
Correct - the other two faulty bulbs are in the middle row (with the black arrows next to them). Not apparent from the photo though - tested with a 7.2V batteryComment
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Re: Digihome (Vestel) LED Backlighting Problem
The two and a half strips that work - voltage drop across each bulb is 2.4 - 2.5V, nice steady bright light.
The two and a half strips that don't work - voltage drop across each bulb is ALSO 2.4 - 2.5V, but they just barely light up. Not only that, but they stay in their just barely lit up state when I put the TV in standby mode!Comment
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Re: Digihome (Vestel) LED Backlighting Problem
Those LEDs are set like Christmas lights. Did you follow Reeceys suggestion about bridging? LED's can fail different ways. Open, short, or fail when they get hot. Maybe there is a bad solder joint somewhere, who knows. You may swap some strips around if it is possible. Maybe a connector could be lose or bad connection etc.Last edited by CapLeaker; 08-21-2016, 01:37 PM.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
I haven't bridged the connectors to the LED strips, no. My test meter tells me all the voltage coming from the PSU is getting through to the strips as it should - have checked carefully - so I can't see how this would help. Am I missing something?Comment
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Re: Digihome (Vestel) LED Backlighting Problem
yours way to test LED wrong. sorry.. as CL wrote before LED are currents not voltage. this mean, each LED had one Ziner Diode bulit in at opposite way, so you need to turn off the TV and each LED with yours test metter als Diode make the measurement,, each LED give you measure in Diode way resistances less than 50 its bad and drain currents. shortet mean will be zero and DMM will peep onComment
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Re: Digihome (Vestel) LED Backlighting Problem
don't give attention on if they light up or not in this stage.. just focus on the Diode way.. you have one line good, take the measurement of one LED as references to compare with other dimm or off one.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
I've quickly tested now. In diode modes the good LEDs (the ones that I've seen light up with my 7.2V battery) show numbers of about 1050. However two of the bad ones give numbers of 100 or 200. And one of the other LEDs shows "1" on the screen which I think means an open circuit, so presumably infinite resistance, no complete circuit and no current flowing?
The bit I don't understand is that I got these numbers by reversing the leads on the multimeter, so that the "ground" lead on the meter (black) was connected to the + side of the LED, and the "live" lead on the meter (red) was connected to the - side of the LED. I hadn't expected this. But I don't get any numbers if I swap the leads around, just "1" (open circuit) every time.Last edited by bigalxyz; 08-21-2016, 02:25 PM.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
I worry that I've shagged something elsewhere because the return voltage on one of the leads from the PSU has dropped to zero. But one problem at a time...Comment
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Re: Digihome (Vestel) LED Backlighting Problem
you use analogue test meter ?Comment
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Re: Digihome (Vestel) LED Backlighting Problem
Im out.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Digihome (Vestel) LED Backlighting Problem
the diode test should be done not via the black or red or brown... you should scratch the line of each LED to test direct on the LED self.
mean the diode test of led should not as groupr or double.. must be each led alone.Last edited by Diah; 08-21-2016, 02:41 PM.Comment
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Re: Digihome (Vestel) LED Backlighting Problem
1050 are so much from my experiences it should be round 780Comment
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Re: Digihome (Vestel) LED Backlighting Problem
check all the working one did one give you less than 1050Comment
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Re: Digihome (Vestel) LED Backlighting Problem
No, very consistent for the good LEDs, all very close to 1050. So I have to assume that's the "correct" number.
As I said, I saw 100 from one of the dead LEDs, 200 from another one, and open circuit (infinite resistance) from another.Comment
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Hello,
I came across this forum because I need some advice about my Telefunken XF43G511 TV. It is originally a Vestel device. For some time now I have had the problem that the TV gets a black screen when the electronics are heated up. The backlight is still there and the sound still works. It's just the screen itself that goes off. When I switch off the TV and it cools down, the TV works again after a while. Could you please give me some advice on what could be causing this problem? I have also attached some photos of the electronics.
Kind regards
Thomas... -
I have an LG Plasma TV 60PM6700 for the past ~12 years.
In the last ~3-4 months I have been having some issues.- Problem: It started with random picture disappearing (sound still worked).
Frequency: Happened about once a week.
Solution: Had to turn off TV wait a few seconds before turning it on again. - Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
Frequency: Happened about once a week.
Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve. - Problem: TV shuts down
- Problem: It started with random picture disappearing (sound still worked).
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i have a problem with thinkpad X1 carbon gen 2 "LMQ-1MB 12298-2 48.4LY26.021"
The laptop was turned off because the MOSFET was not transmitting voltage. After checking it turned out that the gate pin on the MOSFET was the problem, because it was producing an inappropriate voltage. and it was discovered that the problem was with the Think engine, so I decided to reprint each pin, and finally the mosfet could work properly. However, there is another problem, even though the voltage has been supplied to the laptop, it still won't turn on, there isn't even an LED indicator. After double... -
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- OS: Windows 10 21H2
Problem description:
Hi. I have a problem that has been going on for some time (2-3 years). It's hard to explain what it really is. Sometimes, my computer stops playing music, stops videos (starts buffering on youtube), there is no sound in games and when I minimize the game window and return to the game there is a black screen with window borders... -
Good morning,
I have a problem with Lenovo T580, which after error code 0288 suggests a problem with the display. I checked the display and it works on another laptop. I replaced the display cable with a new one. I programmed another BIOS (downloaded from this forum) and I still have the problem of a dead display - there is an image via HDMI, and the system does not detect the built-in LCD at all. The problem appears to be hardware. What can I check to confirm or disprove this? I found many threads on the Internet related to this problem 0288, but without specific solutions. Please advise....
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