Samsung Celebrity Tv with an odd power issue

[zeno]

Run for about 30 sec then unpower & feel the 2SD1555.
To hot to touch most likely bad FBT or rectifier off it.
If cool or a little warm turn up variac & see if things improve.
The amps sometimes fall as the AC volts go up.
Keep in mind the HOT can short again if not careful. My advantage
doing this was knowing what I could get away with !

73 Zeno
LFOD !

[Sealtest]

Originally Posted by zeno

Run for about 30 sec then unpower & feel the 2SD1555.
To hot to touch most likely bad FBT or rectifier off it.
If cool or a little warm turn up variac & see if things improve.
The amps sometimes fall as the AC volts go up.
Keep in mind the HOT can short again if not careful. My advantage
doing this was knowing what I could get away with !

73 Zeno
LFOD !

When I stop fighting with that trinitron project I'll try this.

I'm starting to wonder if something isn't getting enough power in the set. With the Samsung at 90vAC it looks like the trinitron screen at around 50ish volts. I'd suspect caps but they've all tested good so far. Dang TVs are a challenge compared to other electronics.

[Sealtest]

Originally Posted by zeno

Run for about 30 sec then unpower & feel the 2SD1555.
To hot to touch most likely bad FBT or rectifier off it.
If cool or a little warm turn up variac & see if things improve.
The amps sometimes fall as the AC volts go up.
Keep in mind the HOT can short again if not careful. My advantage
doing this was knowing what I could get away with !

73 Zeno
LFOD !

The transistor was cool to the touch and raising the AC caused the amps to go up. Then the screen started pulsing and an odd smell filled my shop. Something is giving off heat somewhere on the board. A laser thermometer really would come in handy probably.

I'm going to look through some case histories and see if any sets in the book have had the same issue or something close.

[dieseljeep]

Originally Posted by Sealtest

The transistor was cool to the touch and raising the AC caused the amps to go up. Then the screen started pulsing and an odd smell filled my shop. Something is giving off heat somewhere on the board. A laser thermometer really would come in handy probably.

I'm going to look through some case histories and see if any sets in the book have had the same issue or something close.

Feel the electrolytics and see if the main one is getting hot or warm. They can give off a funny smell as well.
It's a good learning tool, but unfortunately it's not worth the money and effort you're putting into it.

[Sealtest]

Originally Posted by dieseljeep

Feel the electrolytics and see if the main one is getting hot or warm. They can give off a funny smell as well.
It's a good learning tool, but unfortunately it's not worth the money and effort you're putting into it.

Haven't felt the cap for heat yet, but I can smell something strong when the set is on. Kinda like a mix of burning rubber and warm electronics smell, but it fills the room kinda fast.

Yeah I have to agree. TVs are good to learn on but make no money. But if I was into it for the money I wouldn't be doing it. Personally I just really hate flat screen TVs and want these CRT sets to stick around in general circulation as long as possible.