Question about Panasonic TH-42XVS30U 42 in. Plasma HDTV

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Panasonic plasma tv model:TH-42PV8AZ no power found Q406 rjk5020 short and f401 and 402 8a fuse short,please help what can i do cannot find Q402 RJK5020 can you give me a substitute number to use or whats the remedy.

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Posted on Jan 02, 2017

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SOURCE: I need the transistor RJK5020

Go to newark electronics on line.

Posted on Oct 23, 2010

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SOURCE: rjk5020

Vizio there ausim! or replace the fuses after you unplug it

Posted on Jun 26, 2009

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SOURCE: where can i get a RJK5020 IN USA

ORDER FROM PANASONIC PARTS DEPT. - THE PART NUMBER IS:
B1DEKQ000004
MAKE SURE (!) YOU USE THERMAL HEATSINK COMPOUND, AND YOU DON'T DAMAGE THE SILICONE INSULATOR IN ANY WAY.

Posted on Jun 03, 2010

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Can your power cord be bad on a panasonic plasma tv to cause it to turn off and not start again and blow a fuse on pb


The main power regulator board will have some shorted component/s on it. Normally, these boards to plasma TVs are irreparable. Card base replacement should be done.

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If TV is completely dead you have either a bad power or a bad main board.

Talking form experience I'd go with the power board first.

The alternative is to make sure the power board outputs the normal standby power to the main board and see that the main is not responding to command. That would point to the main.

The fact that Q406 is not shorted does not mean it is good let alone that the power board is good; while the most common issue there it is definitely not the only one that can happen.

You can send in the board for inspection/repair if interested although you're probably better off just buying a replacement.

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1 Answer

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You have a power supply issue. You will need to replace the power mosfet Q406 and likely one or both of the 8 Amp ceramic fuses. The Mosfet is under a heat sink which will also need to be removed. It doesn't hurt to double check the rectifier diodes while you have the heat sink out of the wqay. They are probably fine though. There are also two 10 ohm fused resistors. They are the two small white ceramic boxes R410 and R413. One of these may be open as well.
Parts can be found on ebay.

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This is a dead short, check power supply for diodes bad or zeners

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1 Answer

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When this happened it probably took out Q406 a switching field effect transistor on the power supply board along with F401 an 8 amp Slow Blow fuse. The FET will have to be soldered in if it is bad. If the fuse is blackened, it is almost certain that the FET is shorted as well.

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I had the same problem call sears it's only $99 to come out and free estimate. mine cost $300 and it works great. mine was a circut board had to be solderd back in

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1 Answer

While watching TV the screen went black as if it is not turned on at all


replace fuse 8 amp and Q406 part number RJK5020 both on the power supply board

Sep 18, 2009 | Panasonic TH-42XVS30U 42 in. Plasma HDTV

6 Answers

TH-42PX60U red light blinks 10 times wont come on


On a Panasonic TV the 10-blink error code can sometimes be caused by low voltage running through an HDMI cable, particularly from a Media PC or some video game consoles. Try disconnecting any HDMI cables and unplugging the Television for 30 seconds, then power it on without the cables attached.

If this works, connect the cables to the front panel (usually HDMI-3) which uses a different controller board.

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