I had lightening strike close to my house and it affected my Panasonic 46" plasma to the point that it won't power on. No blinking lights, no sign of life.....nothing. Model # XXXXX it's the only thing that it affected. I've checked fuses with an ohm meter, they seem fine. Any Ideas, need to know if its worth trying to fix or get repaired or just take it to the land fill?
unplugged, switched outlets and power stips, checked fuses on the power board with ohms meter.
Thanks for the question. My name is XXXXX XXXXX X'm sorry to hear about your TV.Don't take it to the landfill. I can help you fix it.Do you have a voltmeter handy? Can you measure DC voltages?Best,Dan
Ok, great.You already checked the fuse on the power supply board, right? Shortly after the AC line hits the TV? Should be connector P9.
Yes all the fuses I just checked across them and they ohm'd out fine. I just checked the P9 for AC and it showed voltage.
Ok, good. So we have AC coming into the power supply board. We need to check for DC voltage coming out of the board. Forget P9... see all the other connectors? Measure each wire on each of those connectors for DC voltage. Are you getting anything?
OK, nothing on P2 or P11 the 2 main connectors comeing off of the board. However I do have fire to a finned looking heat sink looking thing, hate to admit it but I hit it with my knuckle. It seems to be DC after I laid the meter on it?
Disregard the heat sink.P2 is your Vsus connector... very important. Disconnect the connector and measure directly on the P-board (power supply). Still nothing on P2?
there is nothing on P2. I'm only measuring across the 2 prongs that are on P2 on the p-board and there's no voltage at all.
Just to make sure we're on the same page...1. Ground your meter to chassis metal.2. Put your red lead on the Vsus wire/pin.3. Watch your meter as you press the power button.Still nothing?
Still nothing. Grounded on the chassis, pressin the button nothing on the meter
Good work. Thank you.If I was working on this TV, I would replace the P-board (power supply board) at this point. It's the board with the P-connectors on it.Your TV used a couple different versions, so be sure to get the part number from the board itself before you look for a replacement. That way, you can be sure you're ordering the right one. I've listed some suppliers, below.New partsencompassparts.comsearspartsdirect.compartstore.compacparts.comRefurbished partsmoduslinkptstvboards.comtristatemodule.comUsed partsshopjimmy.comeBay.comIf you need clarification or have more questions, click "reply to expert" and let me know. If you're finished, please click the smiley face that best represents the service I've provided. Without your rating, I'm not compensated for my time here. Rating me will not close your question.Best,Dan
USAF trained; currently teaching electronics for the DoD.
Dan, I got the P board from shopjimmy........not the issue. Still no power. any other Ideas.
Are you getting Vsus voltage now?
no, there is no difference in the condition. could this be nothing more then the switch?
No, it's not the switch. To prove that, you can try measuring Vsus while using the remote to turn the TV on instead of the power button. Still zero for Vsus?
Yes, zero, I got nothing.
Specifically, which connector and pin are you measuring?
I'm grounding to the frame and touching the pin opposite the ground on connecter P2 while pressing the ON button?
Ok there are a couple places to measure Vsus. The first is pin 1 of P2. You can also measure on pin 1 of P11. Measure both of those, and see if you're getting the same reading for both. If you're still getting zero, disconnect both those connectors and measure directly on the P-board.Let me know.
I got nothing? I'm grounding to the frame, holding on the #1 pin on p2 and P11. with and without the wire connected, while pushing the Power button. What kind of voltage should I be seeing? I'm not seeing any but I'm curious.
There's a label inside the TV that tells you what Vsus should be. It will differ slightly from TV to TV based on the panel.Disregarding Vsus, do you have any other DC voltages coming off the power supply board? Measure each wire of each connector.Dan
I've got no power coming to any prong coming off of this new P board or the old one. I have interior voltage on the heat sink connects both DC and AC depending on what wire i'm on. But there's nothing on the vsus or the 15v pin coming from p11. there really isn't anythig else that I can see. but i've even laid it on the grnd's. I've got nothing.
Disconnect everything from the P-board except the incoming AC line voltage. The rectifier, at least, should have DC coming off it. No?
I know my way around a volt meter and house components, I know how to figure out most things. I'm not overly familiar with components on a circuit board. I'm assuming that the rectifiers are what is attached to the heat sink? They have ac coming in on the center pole and dc coming off the other two.
The AC comes into the board through an isolation transformer and immediately hits a pair of diodes. The diodes change the AC into pulsating DC. Your meter will recognize it as DC. From the diodes, the pulsating DC is sent to a filter capacitor or two, which changes the pulsating DC into smooth DC. Check the DC coming off those diodes, and we'll see if the power board is working from the source.Dan
From what I can tell I've got dc power to the diodes.
AC goes into the diodes. You'll have DC voltage coming out of them... then DC into the capacitor and smooth DC coming out of that. What do you have coming out of the filter capacitor(s)?Dan
I've got, with my limited knowhow of what i'm doing, current coming out of the cap. This is a new board though, Why wouldn't there be. I think your getting into stuff that is over my head, I'm trying to check what you want me to check but we're checking a P board that is new. Just curious, Should the stand by light or the little light on the P board be on?
If it wasn't at least slightly over your head, you wouldn't need me... so it's OK! That's why I'm here.Ok we need to measure the DC voltage coming off the filter capacitor. Put your black lead on any exposed chassis metal and put your red lead on on the output side of the cap. The output side is opposite of the diodes.Dan
Brother I've measured every capacitor that I can because I dont' truly know what a filter cap is from a capicitor. All of them have some kind of current on them. I know your asking me for a specific one, but i'm still not sure where your talking about. if you could give me a circut board number I could do what you want but I'm not following about the side opposite the diodes. I sent you a picture, did you get it? if you did the power comes in from the right, fuse, into inductors etc. Are the caps that you talking about the blue caps in the pictures?