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What makes the HISENSE LCD (Model LCD 42W58P1) power supply failed to produce output voltage goes to the main pc board?

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  • Hisense Master
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Hi,
First of all the power supply makes 'Stand By 5 or 3.5V which goes to main board. When we give power on command to the TV the main board sends 'stand by or Power ON' command to the power board which then makes other necessary voltage for the main board as well as other sections. If the power board does not receive 'Power On' command from main board, it will not produce the necessary voltages to operate the TV set.

Posted on May 21, 2015

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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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budmrtn

Bud Martin

  • 11361 Answers

SOURCE: INSIGNIA 26" LCD TV > > MODEL# NS-LCD26F

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Posted on Aug 25, 2010

bshldn

Loretta Northcutt

  • 736 Answers

SOURCE: I have a Philpis 42"

Appears that the only other major component is the Servkit assembly
http://www.partstore.com/Model/Royal+Philips+Electronics/Philips/42TA648BXF7.aspx?SearchTerm=True

Posted on Sep 28, 2010

ajestradar

  • 1 Answer

SOURCE: ILO LCD, Power supply issue, MLT169B. 24v output is dead.

I want to know R3 value

Posted on Dec 27, 2010

SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing

You can look at the various module failure symptoms and service / replacement options for the L42HDTV10A here:
http://www.coppelltvrepair.com/search?Q=l42hdtv10a&As=false&Pf=&Pt=&Sid=false&btnsearch=Search

Posted on Apr 25, 2013

SOURCE: I've got a Vizio L42HDTV10A with a bad Main Board.

You can look at the various module failure symptoms and service / replacement options for the L42HDTV10A here:
http://www.coppelltvrepair.com/search?Q=l42hdtv10a&As=false&Pf=&Pt=&Sid=false&btnsearch=Search

Posted on Apr 25, 2013

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1 Answer

I have a Hisense LCD T.V. model H32V77C. Power indicator is red. When I push the power button, indicator turns blue, then blinks red 3 times and returns to blue, then shuts off.


hi sounds like there's no backlight voltage, check power supply board for any swollen caps, if ok, test the voltage on the white connector from the power board to the inverter board , with a meter should be 24v dc thanks

shaun

Mar 21, 2017 | Hisense Televison & Video

1 Answer

Vizio LC470DUG powers on for 4 seconds than goes off--possible mother board


No such thing as a mother board in a TV set. Here is a list of the PCBs
Types of TV Boards Every TV uses a collection of various boards to perform every function imaginable in a television. The boards work together to produce sound and images on a television screen. When certain mechanisms in a TV fail, it may be time to start testing different boards to see if they are functioning properly.

Main Board

The main board, or motherboard, is the central hub of a television circuit system. The easiest way to identify a main board is to find the board with the various video and audio inputs/outputs. Generally speaking, main boards also contain a tuner, HDMI, USB, and S-video port. Main boards are one of the largest boards in a television. This part is also sometimes called the main module or the A/V (audiovisual) board.

Power Supply Board

Another large and important board inside a television is the power supply board. Usually found in the center of the TV, the power supply board has several connectors that supply power to the other circuit boards. It can contain transformers, large capacitors, and integrated circuits. There is usually a table on the power supply board indicating the different voltages it produces in addition to the signal names.

Inverter Board

Found on LCD TVs, inverter boards are used to mount the LCD backlight. These are smaller boards, usually shaped like long, thin rods. If an LCD TV's screen is dark, distorted, or difficult to see, it can be the result of a defective inverter board. Inverter boards fail when inadequate power is not allowing current to pass through the backlight bulb.

Timing Control Board / Logic Board

The timing control board, known as the T-CON board, is typically only found on LCD and LED TVs. Plasma TVs, on the other hand, use a logic board. The functions of the logic and T-CON board are similar: each functions to digitize the information it receives from the TV's processor. This allows the screen to display images on the pixel level. When the T-CON or logic board fails, the screen images may become distorted, leading to pixilation and the appearance of lines on a television. On a logic board, there are slotted connectors on all four sides, while T-CON boards have connectors on just two sides.

X-Sustain and Y-Sustain Boards

Also known as the X-SUS and the Y-SUS, the x-sustain and Y-sustain boards only appear in plasma screen TVs. The X-sustain board may also be called the Z-SUS. These boards function similarly, producing proper screen images. Although they serve pretty much the same function, the two boards work independently of each other. The X-sustain board activates all the display lines at once, while the Y-sustain board addresses all the individual lines of display. When one board breaks down, it probably does not affect the functionality of the other. However, it may be a good idea to have both replaced because X-SUS and Y-SUS boards have a relatively short lifespan anyway. A failure of one could mean an impending failure of the other.

Buffer Boards

Buffer boards are also only found in plasma screen TVs. Connected to the Y-sustain board, a buffer board works to turn output to the plasma display. Common defects of buffer boards include the burning and shorting of power lines.

Dec 03, 2016 | Vizio Televison & Video

1 Answer

I have a hisense 55" tv the screen is really dark but is still working knowing because I did the flash light test. Would it be my power supply panel


If the back light inverters are mounted on the power supply board, then yes, the power supply board needs replacing. If the inverters are on a separate board, then replace that one. Use a voltmeter to check if the different voltages produced by the power supply are present and within +or- 5% of the expected voltage.

Sep 28, 2015 | Hisense Televison & Video

1 Answer

The output voltage is 19.5 volts where it should be 14 volts.What could this be?


Fault with its main 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.

Oct 26, 2014 | Generic Hisense 42" Class LED-LCD 1080p...

1 Answer

Powers up , has audio but no picture


Plasma sets have two separate power supplies; the main supply produces voltage for everything and may even produce a specific voltage for the high voltage required by the plasma display.
In your case, it is likely that the latter (HV) supply has failed.
This may be a separate board and if so, may be user replaceable since these are normally outsourced and just plugged into the set during assembly.
Removing the back of the housing, you are likely to see at least three boards. One of them (the main board) will have many components and most will be smaller in size. The main power supply will have much larger parts on it and the high voltage supply will likely be connected to it and have far fewer parts than the other boards.
It is possible but unlikely, that the main power supply is not providing voltage to the HV board for the display.
If replacement of the HV board doesn't restore the display, then it will be necessary to replace the main power supply too.

Aug 21, 2011 | Vizio P50HDTV20A 50 in. Plasma HDTV

1 Answer

It stays in stand by mode power light comes on and then goes off.


Good day!!!


That problem is usually have 2 causes..Its either power supply board or mainboard..

Please take this steps on how to determine the problem:
  1. Open the back cover.
  2. Check the power supply output...It should have 5vdc for the main board..12vdc or 16vdc for the audio and 24vdc for the back-light inverter..
  3. If those 3 voltage supplies have encountered voltage drop...The problem could be on power supply board..
  4. If the power supply output is normal..The problem could be on the main board...
  5. If the problem is power supply you should check if the capacitors are bulged on the top and try to replaced it..If you can't do that you can purchased new power supply board..
  6. If the problem is on main board there is no D.I.Y repair on that so you need to buy a new main board that fits to your TV..
Hope thissolution will be helpful..

Thanks for using fixya...

Aug 12, 2011 | Sylvania LC225SSX LCD TV

1 Answer

I turned on my tv and the memorex logo comes on the screen then it goes dark then the pictere comes in for 2 seconds then the screen goes black again. I have sound but no picture. I can't even bring up the...


LCD sets (other than those very new) use fluorescent back lighting to produce the picture. Those lights require high voltage to ionize them so the problem could be either the tubes themselves or the inverter that produces the high voltage is failing. Anyone with some degree of manual finesse and possessed of logic can cure this problem but it may be difficult to identify the failed part accurately meaning that if you 'shotgun' the problem, you would need to replace both the tube(s) and the inverter board. The latter is in most sets as a separate assembly which derives its operating voltage from the main power supply and will be obviously attached to the fluorescent tube(s).
The board will have to found from the manufacturer or a company that disassembles scrapped sets.
Check with the site below for availability:
Jimmy's Parts
Search on your set's model number and the term 'inverter.'
The tube(s) can be bought from several US suppliers.

Oct 17, 2010 | Memorex MLT3221 32 in. LCD TV

1 Answer

No power


On the power supply board there will be a connector that says PO which means power on from the main board. Make sure that goes High when you press the power button. Make sure your stby voltages are ok on the PS. If the PO goes High then the power supply needs repaired. A lot of the ic's on these boards are not available for us to buy, so you have to replace the board. If it doesn't go high then the main board is at fault, gets a little more tricky with that, but not impossible.

Jul 15, 2009 | Vizio L32 32 in. LCD HDTV

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