Its possible with that age---see photos to know what to look for:
Thanks. I'll check the boards out tomorrow.
I checked the capacitors for bulging/doming as you suggested. I found 6 that showed some dome shape to them. They happen to be the largest ones on the board. Is it worth just getting a new board rather than replacing the capacitors? It is the first board that the power goes into from the plug, and also where the clicking noise is coming from.
×
I have a Plasma Tv 42 inch and it has a white line across the top of the screen and still see the tv as normal
SOURCE: Philips 42" Flat Screen Plasma - blinking red light 7 times - HELP please!
Here is a photo of the board where I have removed the two from my TV. You can see the two open holes.
SOURCE: Hitachi Plasma TV model P50H401
I think you have problems with the digital main PWB.
If the power PWB failed, turn off and change the pilot ligth to red.
SOURCE: Plasma TV Picture Periodically Blurry/Color is Distorted
This sound more like a cable issue. Also check the leads going from your cable box to the set/ If you are using component cables one of them may be loose.
SOURCE: Problem with Hitachi P50H401 Plasma TV - Will not
I have the same model, P50H401 and it developed the same problem two days ago. This set is 2 1/2 years old in service, being purchased in December 2007. The original manufacture date was October 2007.
The set was turned on and operating at the time and then promptly shut down by itself. The front blue LED power indicator began flashing four times in a loop or cycle.
The flashing LED sequence in this instance points to a problem with one of the following boards: PSU, X-Sus, Y-Sus or SDRs (there are two SDR boards, SDR-U and SDR-D, both are connected off of the Y-Sus board on the left hand side of the frame when rear facing). The set shuts down to prevent further damage to other boards or components.
I could power cycle the set but it would shut down after after a few seconds. Power LED would stay solid, I could hear the PS relays switching, and audio would output through the speakers. Then as the screen was just about to illuminate, the entire set would just shutdown. The blue LED would again go into the 4X flashing sequence.
I could not visually detect any signs of severe component damage on the main PS board. The two large electrolytic capacitors which have been mentioned as problematic in other threads seems fine. The where slightly raised on the top surface, but not blistered or completely blown open.
The only indication of component damage that I could detect visually was on one of the small surface mounted ICs on the SDR-U board.
Through reading other posts on this site, I learned that I was able to remove the suspect SDR-U board and then re-power the set. Doing this proved that the PS, X and Y Sus, and the SDR-D boards where o.k. The PS held, and the lower half of the screen illuminated. (I would only do this for as brief a period as required to determine if the the other boards would function and the screen would illuminate. Do not pro-long operation in this state so as to not cause further damage.)
It was somewhat difficult to locate the correct SDR-U board. My local service rep did not have one in stock, and the Canadian parts distributor was also out of stock. They estimated 10 - 14 business days to order one up from the U.S.A. (Hitachi closed their consumer electronics division in Canada back in 2009.)
By chance, I checked with another service rep in an adjacent town. He had a board for the P55. We did a visual comparison on the two boards and determined that it would be compatable.
The easy part was removing the defective SDR-U board and installing the replacement. The hard part was re-alinging the three ribbon tabs into the respective connectors on the SDR board. Be careful with these ribbons. The other end of each is fused to the plasma panel screen, so if you damage them, your screen is rendered useless.
I initially had the same problems as others have posted with having black or gray lines on the screen when the SDR-U was replaced. After gently adjusting the position of the ribbons as they are seated in the connectors, the lines disappeared. This was a slow and frustrating procedure, but it worked, Be patient.
1,321 views
Usually answered in minutes!
Could it be a capacitor problem on the power supply board?
Yes or a bad power board itself.
I cannot be to brief here--a replacement board will work but the issue usually is the caps ussed are too low a working voltage--they are in the standby part of the power supply--running 7/24 if unit is plugged to power--I had one set where I replaced 7 caps (fixed the set) but went up on the rated working voltage marked on them--an issue then is space--you may have some problem fitting the bigger caps in the board---7 caps of assorted values cost me about 14 dollars with shipping. A new board will have the lower cheaper caps that will sooner or later suffer the same fate.
Well, I thought I saw about 6 or 7 domed capacitors, so I ended up taking the whole ps board into a tv repair guy. He said the caps were fine, but discovered the on/off chips(?) were shorting out. He added a capacitor to them, and said 90% of the time that fixes the problem. It didn't. It must be somewhere else in the system, so I am just going to let him look at the whole tv tomorrow. I'll post what he deems the problem, solution and whether or not if it works. Thanks again for the help.
Unfortunately, I can't even get the tv to turn on. So, therefore no line is visible. I recently found out that my particular model was discontinued in June 2012. The problem is definitely in the Power Supply board, Panasonic doesn't have any PS Boards to sell anymore, so looks like I'm out of luck. Bummer.
×