I came across this KV32S15 that won't turn on, not even any diagnostic standby LED blinks. This means I suspect the power supply section does not work.
PHOTOS: https://photos.app.goo.gl/PzBYVofR2B91Nd2e6
SERVICE MANUAL: https://www.manualslib.com/products/Son ... 12003.html
I opened it up and discharged it. First thing I checked was the glass fuse, there was continuity, so it is fine. The two electrolytic capacitors near the power supply look fine, and other than a lot of dirt and dust (which I took some canned air to), everything seems to be okay.
A few things I'm struggling with:
- General diagnosis -- I am inclined to remove the other boards and strip it down to just the large D-board (which has the power supply section) for testing / measuring.
- The anode is large and not coming off even if I squeeze it. Am I not squeezing hard enough? Should I use the screw driver to push one of the sides of the clip in? I'm worried about damaging it? Any advice on how to remove the anode?
- How to remove this black plastic housing that forms a cubic cage on TOP of the D board itself with the plastic frame with the inputs on the rear and the other circuit boards mounted? Ideally, I can get to the bottom of the D board. Should I just try to continue removing parts one by one?
- How to diagnose and test? Should I try CAREFULLY measuring voltages with my meter with the D-board plugged in (and nothing else)? If so, how do I trigger a "power on"? I'd like to be able to find and measure the output voltages of the power supply section of the board to make sure they look okay.
KV32S15 won't turn on
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- Posts: 12
- Joined: Fri Jun 05, 2020 7:07 am
Re: KV32S15 won't turn on
Hm, I see a lot of Internet replies suggesting to check R601 (fusible resistor) which would be implicated in Q601 and Q602 failing as well as possibly Q591 and R612.
The service manual has a guide to removing the anode, and also a sequence for removing the other boards attached to the D board.
The service manual has a guide to removing the anode, and also a sequence for removing the other boards attached to the D board.