UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - First repair project - PYE 450 (Philips G11). Weird beam distortion.

xereeto · 7th Sep 2021, 3:37 pm

Hi folks,

I'm very new to the hobby of vintage electronics repair, coming from a background of simple digital electronics.

I recently acquired a PYE 450 television from circa 1978 (pictured below), which was completely dead when I got it. After reflowing the solder joints on the power supply board, I was able to bring it to life and after a little coaxing I had it producing a decent picture from a VHS input. I thought I was pretty much home free at this point. However, after being turned on and displaying for roughly five minutes, the image started to bow in at the sides. This distortion is now permanent, and I'm not sure how to approach troubleshooting it. The degree of bowing seems to respond to the brightness of the image, with brighter scenes appearing less distorted.

Attached are images of the television, its internals, and what the fault looks like. Here is a video as well, showing the distortion changing with the picture being displayed.

Any advice is greatly appreciated! Thank you.

7th Sep 2021, 3:37 pm	#1
xereeto Diode Join Date: Sep 2021 Location: Falkirk, Stirlingshire, Scotland Posts: 7	First repair project - PYE 450 (Philips G11). Weird beam distortion. Hi folks, I'm very new to the hobby of vintage electronics repair, coming from a background of simple digital electronics. I recently acquired a PYE 450 television from circa 1978 (pictured below), which was completely dead when I got it. After reflowing the solder joints on the power supply board, I was able to bring it to life and after a little coaxing I had it producing a decent picture from a VHS input. I thought I was pretty much home free at this point. However, after being turned on and displaying for roughly five minutes, the image started to bow in at the sides. This distortion is now permanent, and I'm not sure how to approach troubleshooting it. The degree of bowing seems to respond to the brightness of the image, with brighter scenes appearing less distorted. Attached are images of the television, its internals, and what the fault looks like. Here is a video as well, showing the distortion changing with the picture being displayed. Any advice is greatly appreciated! Thank you.