KP53V25


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KP53V25

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wa7ady
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May 6, 2008, 2:47 AM

Post #1 of 4 (1051 views)
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KP53V25	Can't Post

I have a Sony KP53V25 big screen. Last week while watching a program everything went blank and quite. I called a Sony authorized repair facility and they sent a repair guy out. He pulled off the back, powered it up and listened for a click and immediately surmised the problem was it was immedialty shutting down. He said its too old to repair and recomended buying a new one and that the culpret was the high voltage block and probably unavailable. It was late in the evening and i think he just wanted to go home. Make a long story short....I ordered the part from Sony direct. It isn't the exact part but was listed a replacement part. I installed and nothing !nope, nada, silch! So I grabed the VOM and checked continuity of the old and new. All seems Ok with exception of primary resistance. 143 ohms new 245 ohms old. I would think something would happen but its my guess the teck just wanted to make a quick 95 bucks. Where should I look? There is NO sound and NO video so i'm guessing a power supply problem. I have no schematic and would appreciate any help I can get. Thanks

slinteriors
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May 14, 2008, 1:58 PM

Post #2 of 4 (1028 views)
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Re: [wa7ady] KP53V25 [In reply to]	Can't Post

Check the HV output transitor Q801 and also horizontal output transistor Q508 and another component that can lower the B+ voltage is a faulty capacitor C667 470mf @ 35V

colmack
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Jun 2, 2008, 12:12 AM

Post #3 of 4 (1009 views)
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Re: [slinteriors] KP53V25 [In reply to]	Can't Post

Hi guys,
I have the same set and the same problem, I tried to clean the dust from the set and that seemed to work for a about 8 hours them the problem started again. so this thread will be very big interest to me
also noticed some RGB flashes on the screen before it goes out

(This post was edited by colmack on Jun 2, 2008, 12:31 AM)

slinteriors
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Jun 2, 2008, 1:17 AM

Post #4 of 4 (1002 views)
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Re: [colmack] KP53V25 [In reply to]	Can't Post

If you need the service manual send me an email and I will email you a copy of it. slinteriors@yahoo.com

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