Panasonic Viera TH-50PZ85U Plasma TV - Answered Questions & Fixed issues

Almost sure you have a power supply issue. Or it could be a Y sustain board which for my set is no longer available!!!

The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size. Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. ..

hi look for any swollen capacitors, also plasma's do suffer from poor solder joints on the power board, so check for any rings around the solder pads, test the voltages on the white connectors with a meter the voltages will be written along the connector,thanks shaun

SOUNDS LIKE NEEDS POWER SUPPLY,CALL PANOSNIC CUSTOMER SUPPORT

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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power led, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Surf the site with patience.

Most like one of the scan drive boards is failing. It would need troubleshooting to determine which board is weak.

T'Con fault. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/

hi your tv may be set up on eco mode, there is a light sensor built into your tv this detects the room light and adjust the picture to suit the light hope it helps regards shaun

I had a 42pz80u that flashed 10 times and it was the power supply that was bad. Once I replaced it the tv worked perfect again.

I would first check any of your inputs (i.e. cable, satellite, DVD player, ect...). If you hear this buzzing sound regardless of what input you are using, then it has to be the TV. If it's the TV causing it, audio is produced on the main board or A board named by Panasonic. It is the board that has the A/V inputs on it (cable, HDMI, component). This model has 2 different main boards it could use either TNPH0721ACS or TNPH0721ATS. As a TV repair technician, I often use Tri-State Module and would recommend them for parts. If you don't know which board you need, their customer service is helpful. I hope that helps.

could be a dead remote test with a camera ie phone. look at camera on phone etc wile looking at the remote with the camera press the button if working there should be a light coming from the remote. if not the the inferred led may have gone in the remote easy to replace it is just soldered in. take batteries out of remote. there maybe a small screw in the bottom were the batteries sit. take that out. the with a flat blade on the gap between the top and bottom of the remote on the side. use a flat blade minding your hand etc wile doing this. and pop the cover off. when you have done this there is a led at the end of the remote. replace that with the same size ir red led and put back together remote should be working again.

This may help...

If you wish to get more details, surf the following link. There are over two thousand and four hundred posts. All are related to television and other domestic electronic equipment service help. You can get a solution there. More than Nine Lakh viewers cannot be wrong.http://electronicshelponline.blogspot.com/

use these charts to help diagnose.

these charts can help determine the problem.

try www.retechtv.com I've found many tv stands on that site

count the blinks of the light and that will tell you where the problem is located.

12 blinks on the Th42PZ75U model is indicating the Audio has an issue and is preventing the set from powering up. The A board will need replacement. You can get the A board from www.tvrepairworld.com

This is a power supply issue - found a company that has used power supplies, they sell them for $60.00. We recommend a professional install the board because the voltage needs to be adjusted after the install or you could damage something else. The high voltage in the set can KILL you soe be very careful. The web address for the PS board is plasmafix.com.