Question about Akai PT4298HD Rear Projection Television
I was watching tv and the screen started to shrink and flicker then heard a little pop. the timer light flashes and i hear it try to start and it make the little jingle noise that its starting but wont. before this it also has some lines that move across the screen from time to time. and the colors wont all focus right and i get a greenish tint to everything. how can i get it to turn on and what need replaced to remove the lines and get the green to leave. the center is perfect color but everywhere else it is green.
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Posted on Jan 02, 2017
SOURCE: AKAI PT5598HD
Your set has what is know as "convergence problem" because of the bowed lines and ghost in different colors,is really not an easy solution,the set should have 3 amplifiers(one for each color)and they need to be replaced with an exact replacement,sometimes just by replacing them the aligment should be close but soemtimes you nned to get into the service menu to do some adjustments,the amps(IC's) are mounted on heat sinks and all 3 have the same part number on its face,they normally read STK--- ---,every set uses different amps,If you are familiar with tv service you have now a place to start working but if you are not too familiar be safe and call for help from a servicer.Let Us know if you need more information.
Posted on Oct 31, 2006
The problem is that the convergence board needs to be rebuilt. The board is located up and to the left looking in the back of the unit. It has two large Sanyo stk392-040 amps mounted to it and a grouping of 3.9 ohm 1/2w fp resistors in the yoke return circuit out in front of the amps. It's likely one or more of these will also need to be replaced.
If you're going to attempt this yourself you need to be VERY good at soldering and desoldering and toy should have a good VU meter to check the resistance and tolerance of the components out in front of those amps... Also think about adding a fan to the face of that board with a 9v regulator operating off the 20v +/- line feed. This will substantially keep the amps cooler and less likely to short out again.
If you would like to justa have this done our shop rebuilds these units for $225.00 dollars which includes shipping back to you...
Hope this helps!
William Rayburn, CET
PO Box 442
Long Beach, WA. 98631
Posted on Aug 22, 2009
SOURCE: We heard a "pop" noise
The pop noise could be a capacitor poping its top up.This is a common problem to most TV sets today. Usually located at the power supply board.Once this parts give up it usually shorts the circuit and blows a fuse.Replacements of these parts mentioned will often remedy the problem.Flashing power indicators indicate a problem.If you have the chance of counting how many the blinks are I could have told you the problems code are and the source of the problem.
Posted on Dec 05, 2010
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