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
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.
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May 4, 2010 - I have heard clicks while talking to some of my friends across the country ... in use and i hear a crackilng sound.. what is going on... im not a criminal....... Even on my cell phone i will hear unidentified beeping and random dial ...
I would guess you have a High Voltage Leak at the Anode Lead Cap where it Mounts to the CRT. This is not a area to mess with You are better off calling a professional to fix it. It may be a little difficult to confirm if it is a intermittent problem.
Hope this helps,
The 23" CRT set may have a high voltage breakdown in the flyback transformer or focus divider. Take the back off and operate the set in a dark room. Look for anything that has a blue glow around it or sparks flying when the pop occurs. I won't guarantee this will find your problem, but it is definitive if you see these!
I once had a set with these symptoms. I stopped the blue glow and arcing by covering the focus divider with epoxy. It worked for a couple of months before the divider literally broke apart.
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..
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
completed in one call.
replacement tube can be purchased here http://www.mcmconnect.com/lampsandmounts/catalog/search.do;jsessionid=C8463FCF1BF9E7E924ECF2F1182C7529?searchtext=SONY