Slightly Different Vestel 17PW26-4 Problem

[Techstar]

Re: Slightly Different Vestel 17PW26-4 Problem

I know i tested the backlights to see if they all work but how can i prove a tube is not pulling too much current , do you know of any way to test a tube this way any one. A tube that pulls too much current can cause shut down.

[tom66]

Re: Slightly Different Vestel 17PW26-4 Problem

You can use an old CFL/energy saving lamp as an inverter tester, see here:
https://www.badcaps.net/forum/showthread.php?t=19987

[Techstar]

Re: Slightly Different Vestel 17PW26-4 Problem

What do you think about this idea , i remove the connector on the suspect lamp that connects to the inverter, i then solder to the board where the connector goes 2 wires and solder these to
a lamp out of a scrap tv. Just a simple substitution test. Only 6 tubes in this tv so i might try it.

[tom66]

Re: Slightly Different Vestel 17PW26-4 Problem

That would work too.

[Techstar]

Re: Slightly Different Vestel 17PW26-4 Problem

not sure at all 20-30 seconds is a long time just saw this on another forum whilst on google looking at another sharp fault worth checking though and the lamp error reset is a good tip i never heard of that before.tom or budm may have more ideas to what the fault could be.

Could you give me a link to this forum you mention please please vince. I would like to read what they say about it , i don't think the inverter board on this tv here is the same though but i would be interested to read about it.

[vinceroger69]

Re: Slightly Different Vestel 17PW26-4 Problem

its on here somewhere i was reading various threads lol
http://www.tv.quuq.org/index.php

[vinceroger69]

Re: Slightly Different Vestel 17PW26-4 Problem

its on here somewhere i was reading various threads lol
http://www.tv.quuq.org/index.php

may of also been this forum


http://www.highlandelectrix.fsnet.co.uk/myweb/tvs.html

[Techstar]

Re: Slightly Different Vestel 17PW26-4 Problem

Some thing crossed my mind about trying to use some kind of dummy load in place of a tube. For testing purposes of course. What about putting a high voltage high wattage resistor in place of the tube . I still suspect a possible inverter or tube probem with this annoyance of a set.
It ran for 5 minutes today , i thought my re flowing of joints on the inverter board had cured it but sure enough it started going back to standby again. Only last a few seconds again after the initial good 5 minute run. Got 3 electrolytics on the main board to test tomorrow and going to test the SM caps on the main board. A main board will be best part of £45 so have to keep testing. I will be testing voltages on the main board too, might just be a regulator or a bad joint or connection if i am lucky. I tried heating components with the hair dryer and cooling with freezer , but nothing seems temperature sensitive . Update :-

I Just found a replacement main board for £20.

[jimmy007]

Re: Slightly Different Vestel 17PW26-4 Problem

Hi guys, i have problem with a 32'' tv Schaub Lorenz. LT32-354AB
Ι have the usual problem with flashes stand by led and the tv won't turn on.
So i want to check firstly the power supply (17pw26-4)
I measure the 3.3v and 5v voltages but no 12v and 24v.
I try to connect the 5v voltage (pin 14) with the BL ON OFF(pin 8) but again it won't turn on and i haven't voltages 12,24.
How can turn on only the power supply to check it?