Re: Telefunken LED TV with no standby linght equipped with Vestel 17IPS20 PSU


Because I was probably writing that post in that time I did not see your reply. I'm terribly sorry. Also feeling embarrassed because I did not know understand that the multimeter needs that feature. However having replaced them with new ones (hopefully good also) it leaves the impression that the issue lies before that entry point. Does U202 only handle DC ? (might have to probe the other pins ?)

Because I don't have the tools to properly test caps and the issue is significantly...

Re: Telefunken LED TV with no standby linght equipped with Vestel 17IPS20 PSU

After ordering new capacitors and testing them out I found out that the digital multimeter wasn't set to the highest resistance (in the video the knob was set to 200k when it should have been set to 2M). Setting and rerunning the test on each capacitor get below 0.56 initial readings => the initial capacitors were fine.

I still had them replaced since i did unsolder them off the board to test them but the problem hasn't disappeared. Still getting the fluctuating voltages on VCC_M both...

Re: Telefunken LED TV with no standby linght equipped with Vestel 17IPS20 PSU

I see, so the voltage measurement should be steady, now its just turning on then turning off in a loop.

I measured the diodes (D517 isn't present) they seem ok (D214-215.png).

I went to measure the capacitors. Took C207 from the board. You can see the measurement in the video (C207-Measurement.zip). From my understanding this seems faulty as the charts indicate a maximum of 0.56 ohms (47uF-63V) while I get over that. Multiple readings are inconsistent as well. Am i right or...

Re: Telefunken LED TV with no standby linght equipped with Vestel 17IPS20 PSU

Thank-you kindly for further advice.

Upon inspecting the datasheet of U202, it specifies that VDD is an output DC voltage. I proceed to measuring that. Upon measurement I received variable readings over time (made sure not to move and held breath) on the multimeter (the zip archive).

Is it ok though ? since its a PWM controller the output voltage is supposed to vary in my opinion.

Is there anything I could check further on U202 ? I looked at other outputs but...

Re: Telefunken LED TV with no standby linght equipped with Vestel 17IPS20 PSU

Thank-you kindly for your help and guidance.
With power not applied to the board and the multimeter in continuity mode I checked the mentioned fuse (FS100 in schematic). It was ok (it beeped).

I moved on to the N channel mosfet (Q301), after looking up the model , with the multimeter in diode mode I checked between S-D (more details in the attached PNG file). It gave good readings (0.544 red probe on S, black on D and no reading when reversing)

In that area I read...

Hi everyone,

Searching the forum revealed loads of issues with this type of power supply board however I could not find a solution to my issue from them. Excuse the "another Vestel" thread

The full story was: my Telefunken TV did not have a standby red light after of series of power outages in a couple of minutes. Sadly in my rural city the only technician that fixes TV's is away these days as I cannot reach him by phone. I want to try to have a go at it (with the internet's help).

Reading into this symptom the general consensus was that...

Re: New Members - please post your introductions here

Hi everyone, newbie here looking to learn and solve my problem with a vestel ip17ps20 power board for my tv. Saw many posts about it and hopefully I can solve the issue and improve my insight into electronics.