Question about Sony KP-43T90 43" Rear Projection Television

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Kp-43T90 power supply

Your right it makes that noise so what do i do and how do i fix it

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Sorry to say there is a shorted ??? which will require some electronics background or at most a good understanding of DC power supplies to get to the bottom of it.

Posted on Aug 01, 2008

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My kp-43t90 is flickering with white lines on the screen and making poping sounds . i've checked all conections and tried other tv's and they are fine'what could my problem be?


I had a similar problem with my 42 in Philips LCD HDTV.


Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.


Here are some options for you.


1. Have it fixed by a professional $$$$$$$??????? (Is it under warranty?)

Remember, TVs CONTAIN HIGH VOLTAGE AND CAN KILL YOU! Do this at your own risk.

2. Open your TV and find PSB. (The board that the power cord plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps replace the entire board. The entire board costs around $250 right now because they are in high demand right now. They can be found online. I would definitely shop around though.


3. Remove and then replace individual faulty caps. This takes some soldering skill.

Caps are inexpensive and if you can take care of it yourself it will save you hundreds.


This may be your problem. If you determine that it might be.

I have a Tip/How TO tutorial on this site that may also help. It gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. Here is the Link: Fixing the Philips Turns/shuts off on its own problem. I

Dec 17, 2010 | Sony KP-43T90 43" Rear Projection...

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Sony kp-43t90 picture looks like 3D what is the part # for the convergence chip?


Hi and welcome to fixya.

To answer your question;
Those convergence i.c numbers are STK392-150 .
But if you are into repairing your convergence circuit then perhaps i may have a suggestion,
It is very common to have resistors and/or picofuses burn along those convergence i.c`s, so just replacing the i.c`s may have little visible effect as they will be missing some the the needed operating voltages.

So you may consider buying a kit that would supply all the parts you may need along with instructions.
Here is a website that sells a kit for your model;
http://www.tvrepairkits.com/xcart/home.php?cat=1487

Note that i`m not working to sell any parts, just though that it may make your life easier.
Hope this help and happy holidays.

Dec 14, 2010 | Sony KP-43T90 43" Rear Projection...

1 Answer

Double vision on a sony kp-43t90?


you likly have a convergence problem (is that a crt projection TV?)

Sep 18, 2009 | Sony KP-43T90 43" Rear Projection...

2 Answers

No power no lights good fuse...


Try a different power outlet? Possible shut down of DC supply due to short circuit can be heard if listen close at back of TV on plug in or power up with remote for a quick squeel then ticking sound or tick tick tick and nothing.

May 13, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Sony tv


The issue is most likely a bad bulb. If the light that you are getting is flashing red than most likely it is a bad lamp. If this is the case you are looking at probably $200-350 dollars.

May 10, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

GHOST IMAGE ON KP-43T90


this problem is caused by the pal 50 - 60 meg problem, the sony runs at 50 megs, if you have a 60 input from an hdmi lead you will get ghosting

Mar 05, 2008 | Sony KP-43T90 43" Rear Projection...

1 Answer

Which ic's replacement


i dont see them on this pic

i just looked at the schmatics and they are stk392-150. they are located on the G board ic1502 and ic1506

Apr 02, 2007 | Sony KP-43T90 43" Rear Projection...

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