Question about Pioneer SD-P50A3-K TV
(1)Chassis removed,cleaned and soldered (2)Power/Convergence pcb overhauled,ie pins re-soldered on all four regulators on large heat sink,conv.Ic's replaced w/tosh stk-392-110T,touch-up soldering complete. (3)any/all fuses/fusibles checked,regulators seem to check normally What am I missing??
This is protection default. There is a circuit inside most modern tv sets that upon detection of excessive current (short) from any section of the tv, it shuts down. All the best
Once the protection system has been activated it usually requires service and such service is usually quite expensive. In the tv industry this phenomenon is called "the kiss of death".
However, before you start to panic, do the following:
ONE: A hard reset. Merely unplug the power cord for at least 2 hours; sometimes it takes a full 4 hours. This will reset the protection and all other circuits in the tv and when you power it back up it will restore everything internally to the factory preset conditions.
TWO: If the hard reset does nothing, try the Whack and Smack test. This will check for bad connections internally and cold solder joints. Just whack the set vigorously with your hand or fist in a variety of places. Doing so will often awaken a bad connection.
If the above procedures do not help then you will need a service tech, one that is authorized by Pioneer, to inspect it and take measurements in determination of the problem.
Common failures are power supply, high voltage and deflection amplifiers. Cost of repairs are always over $200 and can go as high as $600 depending on the specific ailment found.
Hope this will give you some valuable guidance.
This is protection default. There is a circuit inside most modern tv sets that upon detection of excessive current (short) from any section of the tv, it shuts down.
All the best
Posted on Oct 14, 2007
The T at the end of those STK means they are made in China. Start there first. Those are factory reject or aftermarket type ICs. You should always use the Sanyo IC's. Those are original replacement ICs. We all know how China has been making things these days. You can get the right IC's from here http://www.electronic-repair-kits.com/STK392-110.htm If you still have a problem after that, you will need to get a service manual and send it to me to have a look. Good Luck
Posted on Sep 26, 2007
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1) Pull chassis---remove power/convergence PCB==the one
with the large heatsink on it.
2) Remove solder from pins of four regulators on heatsink.
3)Clean board/pins w/ toothbrush & alcohol.
4)Re-solder, also solder both Stk's for prevent.
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