Vestel 500UNDC using a vestel 17PS20 power board. Backlights come on and picture shows for a few seconds and then goes dark. Sound is fine. Is this a problem with the led strips or the backlight driver ? Many thanks
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Re: Digihome TV loses picture after a few seconds
More than likely the leds. But as you haven't stated whether you have checked anything then it could be either! I suggest you get your meter out and check the output voltage for the leds. One lead on chassis other on the output connector. Check for highest voltage across the terminals. -
Re: Digihome Vestel 500UNDC TV loses picture after a few seconds
I have tested the leds with my home built LED tester. They light up and if you power on the rest of the set we get a normal picture ( a little dim with my led tester) and sound.
In normal operation the leds come on for just a second So it appears that the drive circuit is shutting down. Thanks for your response.Comment
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Re: Digihome Vestel 500UNDC TV loses picture after a few seconds
The problem could be with either! Led testers do not output the correct driver current compared to the psu led driver circuit and I have had led connectors go slightly high resistance and shut down the driver board! This has caused hours of head scratching before! If you suspect this then best way to check is to see if the output voltage is fluctuating on the led tester. It will be a good indicator as to issues with the leds or the connectors between the strips. Checking the connectors is easiest carried out by monitoring the voltage drop across the connectors. If it is very low then good if it higher compared to other connectors then wire bridge the connector. Obviously you will have to use the led tester to check the voltage drop across the connectors.
Good luck
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This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.
Problem
TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode... -
Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.
The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.
Original T-con:
Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.
First replacement T-con:
I thought it might be t-con and ordered new t-con from china(supposedly tested)... -
Hoping someone has troden this path before !
I'm looking at a JVC LT-39c790 - a vestel based unit.
So, the remote turns it on, led's light up but no picture at all.
I have a spare mainboard, so I know its not that. The PSU seems ok too.
On the AUO T-Con I've got 16v on HAVDD_H but nothing on HAVDD_L - which I'm assuming should also be 16v ?
So, Ive resorted to testing eveything I can on the board as I can't find any schemas for it (AUO 39T15 C04 Ctrl Bd) and I think I've found a diode gone short. it marked D005 on the board and E1 on the package... -
Hi all,
I have a Finlux/Vestel Led Tv with the following fault and cannot reason from where the fault is. Fault is:
Sound ok, Backlight ok, Picture nothing but colour vertical lines. power supply vestel 17 IPS 71, main board 17MB82S
Checked 12V on tcon on fuse ok.
Checked 12v and 24v on power supply ok.
Volume works. removed l left ribbon cable no picture white on half, and same with right one.
Any idea from where I can start please?
Any help appreciated please.... -
Hey, I got an Telefunken 4K D50U TV in for repair. Since the problem is t-con flex related, I isolated the problem to one side (right flex of the t-con). I taped the flex a bit, but i couldnt get any further. I attached the pictures of the t-con board in zoom in perspective. I would appreciate help for this TV. Please note that I came from Germany, so it is a bit difficult with the time zones. Greeting Tobi...08-29-2024, 03:47 PM
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