Sony (Dell P1110) Trinitron Monitor with 1 bad cap...

[Topcat]

I snagged a true flat Sony Trinitron (Dell branded model P1110) 21" monitor for nearly nothing the other day... Of course it didn't work (I knew that when I bought it)... I finally cracked it open today...

The monitor fired up but had no display... Upon further testing, I discovered that the filament voltage was missing. I substituted filament voltage from an outside power source, and she lit up like a Christmas tree... This told me the CRT wasn't defective, so I started backtracking the filament power circuit. I ended up in the power module, where I discovered a vented Rubycon 100uF 25v cap, (yes KC8, it was a GENUINE Rubycon ). I also discovered a shorted diode package (part# YG802C09) in the path of this fried cap. What probably happened was the diode package shorted, fed back through the cap and popped it. I replaced both components, and viola! The SHARPEST monitor I've ever seen!

While bad caps was not the initial cause of the trouble, it was the end result...

[kc8adu]

thats a common failure.
when the rectifier fails short/leaky the cap gets ac.
poof!
see that on several sony chassis.
good find!

[deathamatend]

Re: Sony (Dell P1110) Trinitron Monitor with 1 bad cap...

Topcat, I know this is an old thread, but I also have one of those 21" dell trinitons monitors which I love, too. I have had it apart to clean the dust out a few times, also to tighten a few screws to keep the degaussing noise down, and it is perfectly clean inside and out. One day, on powering it up, I heard a couple of snaps and the picture collapsed to a line down the middle of the picture tube. It is now, not powering up, and the LED power light now blinks yellow when I would plug it in. I am capable of advanced diagnostics and repair. I can add that I followed Badcaps advice and instructions on repairing a Westinghouse SK-19H210S which now works perfectly, so any help provided would be greatly appreciated.