Question about Sony KP-53S35 53" Rear Projection Television

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Loud pop, and no more picture???

I guess im looking for some help here. i was called about a sony kp-53n74 that experienced a popping noise, and then no longer functioned. i know alot about electronics. from crt repair, to actual board engineering. but im looking for any guidance, as i dont work on rear projection tvs. thanks

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I don't know if this will you but I just experienced a similiar problem with a sony kp-53s35.
It turns out that a fluid leaked out of a rubber boot on one of the guns( I have no idea what the fluid is or why it is corrosive), down to a circuit board and started to desolve a jumper wire. when it had eaten away enough of the wire, the residue or solution was conductive enough to cause an arc to a ground bus bar that ran along the circuit board. The TV still worked but would crack and pop like firecrackers inside.
I was able to increase the distance to the ground source by bending the bar away. Then I scraped and scrubbed the board with contact cleaner to remove residue and replaced jumper wire.
Has worked fine since.

Posted on Feb 23, 2008

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Posted on Jan 02, 2017

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Let me make a guess from experience.

The lines or noise is worse when set first on or after it is on a while.

My question is does it get better/worse after on for a while; if so I can tell you what part is bad.

A photo of picture posted here would tell me instantly.

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500e759.jpg

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no really, I am just a smart a$$ --- but the loud pop sounds like it may have been one of the capacitors in the power supply board. check for a POPPED cap (rare) and if there is one, test the components in the related circuit - as SOMETHING had to happen to make a cap fail like that - maybe a voltage regulator? give it a look..

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have you call sony direct?
Sony received reports of flickering on select rear projection TV models and immediately started an investigation. Sony's engineering team found that in a small percentage of sets (less than 1%) made with impregnated cathode CRTs, the material used to impregnate the cathode may attach itself to another section of the electron gun and cause a mild brightness fluctuation or change in hue.

Once this problem was diagnosed, Sony published a Service Fix for this issue and authorized Sony Service Centers and Authorized Service Centers to make modifications and replace all 3 CRTs in affected units at no cost to the consumer in order to resolve the issue. In addition, a change to the manufacturing line was made to ensure that current units do not experiencethis problem.

If a consumer is experiencing this symptom, contact Sony Call Center (800-222-SONY) to schedule a service call. Sony has extended the warranty on these models for this issue and is working with authorized service centers, providing all current information for the repair as well as assisting them in ordering the parts beforehand, so the repair can be
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replacement tube can be purchased here
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