Sylvania 6842-PEM 42 in. EDTV-Ready Plasma Television - Answered Questions & Fixed issues

Open the back of your TV. And check your video wires basically check all of your wires. And yours pictures should come back in a lot of flat screen TVs have an issue with just loose wiring causing no video.

This is a fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.

When troubleshooting these units, there are always several variables to consider. First check to see what last occurred with the unit such as did the children play video games, did the electricity go out due to bad weather. You may see that there are many possibilities but let's focus on what occurred last to the unit. Once we determine what happened last, we may isolate the actual cause of the problem. The actual cause may be associated with projection issues, older versions (Picture tube), interference from devices located nearby, and even a radio turned on and located really close to your unit. This is normally known as electromagnetic interference to electronics and is very common with the error you have provided today. Please continue to look for anything EXTERNAL to the unit before looking at the internal components. I have been working on these a long time so feel free to follow up with me.

You need to check and see if the VS and the VA voltages are right. There should a lable on the inside panel that let you know what the VA & VS should be reading. If those are correct then you could have a bad Y-Board.

Yes,replaced all the boards that related to the power supply.Useally completely dead,it effect all the ICS in the boards,never able to tell which boards.U are not a tv tech.don't do this everyday's will not have skills or any idea which board is dead.

My Sylvania Plasma Tv has sound and no picture

HD will only go down the HDMI (wide and skinny) port or component (red, blue, green) port.

power board ic converter it dead.
Need new power board can get in the web.and replace it or hire tv. repair man part labor $575

it sounds like one of the boards are going out I would call sylvania and check with there service dept maybe they can send a tech and part out under warranty If you need further help, reach me via phone at https://www.6ya.com/expert/david_eb7ea98642566cc6

try to replace all popped capacitors on the power supply board first,the tops of bad ones will be heaved up in a "bubble"

The most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

GO TO THE MENU ,,TRY THE COLOR CONVERSION OPTION,, OR CHANGE YOUR CONNECTION JACKS

Here's where you can get the service manual:
http://www.nodevice.com/manual/Funai/page4.html

The main power board is going to be the one with the power cord attached to it. Basically, it should be the same board with the fuses on it.

your transformer on your power supply is bad, i would recomend replacing the power supply, usually when the transformer goes bad , it damages other things on the board, should be around a 200$ part

I had the same issue. Turned out to be a blown capacitor on the power board.
<a href="http://s133.photobucket.com/albums/q68/rwlib3/?action=view&current=DSC_0426.jpg" target="_blank">

Have fixed a bunch of those as a Sylvania ASC. There is a small ceramic capacitor on the main power PCB that has ruptured. It must be replaced with a different part, a special type of capacitor, or it will just fail again. Sylvania had recommended replacing the main power PCB rather than repair because sometimes there was additional damage on the board, however replacing the capacitor fixed every one that came to us. I preferred that because some electrical voltages have to be adjusted if the circuit board is replaced with a different one.

Finally I have managed to fix my plasma 6842PEM. My problem was the SS (Sustain) Board and not the Power supply. This board is the vertical one to the right connecting to the Screen/Panel. I tested every component on the board and found one of the Transistors on the heat sink was bad, part # 2PG001. This board is made by Panasonic which can be replaced. I got the Transistor which only cost $20.00 including shipping.

To identify wether this is your problem, disconnect the cable comming from the power board and put on the TV, If the green light stays on then this is your problem.

Thanks all for your help.

Laz

Blown Capacitor C2250 on the main Power supply. Little blue capacitor.
http://i133.photobucket.com/albums/q68/rwlib3/DSC_0426.jpg
I have a couple left.

We found the blown capacitor on the main power board, bought a replacment for 40 cents, and replaced it. The monitor is working again.

If you are certain that the capacitor is OK, there could be a different problem on the main power board or even on the sub-power board. The sub-power board should have output voltages even if the main power board is defective.