[Giulio Maiocco]

Hi,

I'm having a strange problem I've never had before in any vintage TV I have restored.

A friend of mine found a Philips TV identical to the one I posted some photos on this forum, but I found the LOPT overwind damaged in the last layer, as someone poked with the screwdriver on the winding and damaged it. I fixed it removing about 10 turns from the overwind that were damaged and I got the continuity again (430 Ohms).

I fitted a new EY51 and I have the following problem: with all the right voltages at the CRT, it shows a very dim raster you could only see in a dark room and with the brightness and contrast controls turned fully up.


The EY51 is lit and I could draw a 1,5cm spark (but I have to put the screwdriver at about 6-7 mm to start the arc)from its plate. The ion trap is correctly adjusted, as to obtain maximum light and the CRT tests as new (over the full scale of my B&K465, that is 1000 and the cutoff voltage test is right). When you crank the brightness fully up, the image blooms in the vertical direction..

The boost voltage is in the range of 560-600V, as my own TV (mine has boost voltage going up to 640-650V with a blank screen) and the PL81's control grid is at -17V (about as mine), the line whistle is barely audible when you are near the EHT cage. You do hear the sound of the CRT charging, so I think there is at least some EHT...

Could it be that the LOPT is not resonating? The spacers for the gap are still present

What else could cause this problem? If it could be of any help, I could post the schematic

Best Regards

Giulio Maiocco