20 Most Recent Hitachi 42HDM12 42 in. Plasma Television Questions & Answers

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; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Hello, Convergence problems are usually caused by a diode on the convergence board. These little critters have a tendency to short out and cause the convergence to do strange things.
Obviously, this is not a job for the home owner because few of you know electronics. So, call in the technician to make the troubleshooting of the circuit. The diode costs $.98. The technician will cost you about $250. Don't ask me to explain it. That's the way it is today.

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, check your system input settings, verify your display settings, and confirm that your properly connected to your cable service.

The Zsus and or the Ysus boards are common failures. You can unplug the Zsus board from the power supply and if the power stays on, I would replace both the Zsus and Ysus boards.
I hope this helps,
Skyassoc

you need to replace the ABUS-L-PWB on the left side about $75 for part.

pls. check current it seems overload.

1.Press [stop]button on DVD player to Stop DVD Playback
2.Press the [resolution] button on the DVD player.
3.change resolution to 480p
if you get a picture in 480P, continue your setup of the DVD player
If you still have no picture perform the next steps (stop at the step if you recieve a picture):
4. verify the video input of the DVD player to the TV and reselct it on the TV
5. use Video cable to verify the DVD player is still working
6 disconnect/reconnect HDMI cable to TV
7. power off/on the TV
8. power off/on the DVD player
7.
5. turn off TV then Tunr

This is set automatically if your tv supports 1080i and the res is comming in lower there is nothin g you can do to change that. Otherwise its all automatic. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

What brand? what model?

you can get info from reading threads or ctechnicians.com

first of all check your connecting wires see if they are not broken inside.or try some new wires.if that does not solve your problem then you have to start looking at the tv as defective,therefore,it ca be either of these problems 1 defective tuner associated with vertical problem. 2 faulty IF-AGC section solution ajdust IF-AGC verify active components leaking,open,or shorted IF transistor or IC REPLACE either.one more thing give it some slight tap on the case if it resume operation you have lose solder then the circuit needs to resolder.if it remains the same considering the above take it to a tech.good luck.

Sounds like you have AC leakage somewhere. If you have cable TV, disconnect it from the TV and see if the line dissapears. If it does then most likely it is a faulty cable box or a bad ground on the cable system.

That sounds like it is not booting properly. I would check for correct power supply opperation and if not that, look for a software reloading procedure in the user instruction manual.