Hitachi P42H401 42 in. Plasma HDTV - Answered Questions & Fixed issues

IF you got a good board and a lot of replacement boards aren't good the only other thing that would make the set dead is if you have a bad main board, if your able to pull the back off and test the either 3.5 or 5 volt standby voltage if its ok then look at the PSON voltage, it should be at a half volt and go to about 3.5 when the power button is pushed..if you don't have standby you have a bad power board yet, if you have standby but no PSON the main board is bad, if you have PSON its back to the PS as being bad...Good luck!!

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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 section 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" or "Magazine" will make surf easy. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Surf the site with patience. Do a search by type in the brand name of the device to the search box.

PROCEDURE:

(1) With Plasma turned On, Enter the I2C Service Menu: (Remember, you are doing this without seeing a picture).

• Press "EXIT" once, just in case TV Guide is brought up for Set-Up.
  

• Press "Menu" and wait a few seconds.
  

• Press "Menu" ~ "Menu" ~ "8" ~ "Select" Buttons on the Remote:
  

  • CLU-4371A, CLU-4372A, CLU-4373A, CLU-4374A or CLU-4371UG2.
    

• The Service Menu is entered, even though you can not tell.
  

Service Menu selection you can not see

• To navigate and adjust while in the Service Menu, use the remote control's Cursor Keys.
  

There is probably an overscan option in the TV menu. Make sure that is off. Otherwise, adjust the resolution on the computer to fit correctly.

does your plug have a reset on it?

If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. Electro help

I assume that you have already identified the bad capacitor/s? Then it is an easy fix by unsoldering and replacing the capacitor/s with the same values. Caution: Ensure that the same orientation of the + and - leads are installed in the same manner of the original capacitors.

I experienced the same problem for about an hour before recognizing that the "continuous on" closed captioning had been activated on my cable box, not the TV. The signal feeds through despite the CC settings on the TV. If you haven't already, try checking the CC settings on whatever device is supplying your video.

Based on what you have tried if a buzz or loud static via the speakers you have something wrong in the audio output circuit of the set--problem here is that circuit may be part of the Main board that processes all signal---a look inside---following the speaker leads back would lead you to that board.A simple thing to do to narrow it a little (you may have done this) is with sound all the way off put your ear to the internal speaker--hear anything at all like a deep hum?Depending on age of set and cost of the board likely bad it may or may not be a do it yourself repair.SD TECH

I suspect that your power controller board has a problem and is causing the shutdown. If it is under warranty, get it fixed under warranty. If it is not, it may be possible to purchase the board and install it your self. Be careful though plasma TVs have some areas to avoid when servicing.

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom (look for discoloration of the circuit board around the base of the capacitor) need to be replaced.
If you repeatedly turn it off and on, eventually it'll probably stay on, but every time you turn it off, the unit will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for some time and then try again.

If you aren't tech savvy, don't worry, read the rest of this solution and watch the videos.

If you are handy with a soldering iron and can identify the power supply and/or inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are SURE it's only doing supply output ripple filtering,
and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.

http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

Backlight related video here:
http://www.youtube.com/watch?v=6XoF6QZ1dmw&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors, amplifiers, computer power supplies and motherboards, and other electronic equipment.
The parts are cheap, and skill required is minimal.
A great parts source is Digi-Key, and you can order the parts online at www.digikey.com
They typically cost under a dollar a piece plus a flat shipping rate.
The parts usually arrive one business day later.
If you watch the third video, you will see that even someone with no soldering experience can perform these repairs as demonstrated by the woman in the video.

find and push the "reset button"

Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck..

Hello there,

Step 1: check all connections redoing them if needed mean remove the cables and plug everything back in .

Step 2: check the plug, plug something you know works into the plug to Test it

if the plug has power plug the TV back in and try the front panel button to turn on the TV if the TV still doesn't turn on let me know and we try a few more steps

Thank you don't forget to Rate

a fuse you can replace also, if it has lights on, then it's not the fuse. Main fuse kills everything.

It sounds like a repair is required, but to confirm:

With this model, you can try unplugging from the wall for at least thirty seconds, then plug in and switch on. (That's if you haven't already).

If that doesn't work, there is a fault causing the power supply to self protect and shut down again. Repair will be needed.

check software upgrade

Check software version and see if there is an upgrade, website