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Replacing main board

TV will not stay on tv repairman said the main board needs replacing

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  • bigeb119 Feb 23, 2009

    Westinghouse LVM-37W1 37 in. LCD hd MONITOR THE TV WHEN YOU TURN IT WILL NOT STAY ON IT CUTS OFF THE TV REPAIR MAN SAYS IT NEEDS A NEW MAIN BOARD

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Westinghouse LVM-37W1 37 in. LCD hd MONITOR THE TV WHEN YOU TURN IT WILL NOT STAY ON IT CUTS OFF THE TV REPAIR MAN SAYS IT NEEDS A NEW MAIN BOARD

Posted on Feb 24, 2009

  • bigeb119130 Feb 24, 2009

    Westinghouse LVM-37W1 37 in. LCD hd MONITOR THE TV WHEN YOU TURN IT WILL NOT STAY ON IT CUTS OFF THE TV REPAIR MAN SAYS IT NEEDS A NEW MAIN BOARD

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While that is possible, it seems a bit drastic. That being said, the only way we can truely respond with useful information is if you provide us with the make and model as well as a description of the problem.

Thanks,
Dan

Posted on Feb 23, 2009

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Posted on Jan 02, 2017

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Why does it take longer for the volume of my Protron pltv-32cm to go on each time we turn the tv on?


Proton 32, most plasma and lcd TV's have internal boards a few control the stability or video display these secondary boards are controlled by a main board. if your having sound or tv function issues the main board may be defective. is it worth fixing? that depends on the service center and what they are estimating it to cost. it is repairable by replacing the main board and that's if your screen itself is not the factor yet also consider the price for the repair vs. the price of a new set. you can get this part at auction sites or buy it online and repair it yourself or with a someone who understands electronics that would save you some cash. best regards..

Jun 14, 2014 | Protron PLTV-32 Television

1 Answer

I have a sony bravia kdl40v2000 lcd tv stays in standby mode with green light on all the time, no picture no sound, suspect capasitor fault on power board, which capasitor need replacing


There are no paticulator capacitors components parts are dying and or leaking in sequences in any forms of numbers on the tv power supply board.It could be any numbers capacitors components anywhere in the tv power supply board could be dying and or leaking.U must have to take tv parts and examine the power supply board carefully for dying and or leaking capacitors components parts.Very easily to spots dying and or leaking capacitors components parts because 90-95% of the times they're alway puffing and or bulges up on to it tops it is looking like it about to be exploded out of it cylender container.If the tv every times u turn it on the tv power the tv LED power light indicator are alway stay on a good solid green color,LED power indicator light never blinks or flashes at all.Mean the tv does not have a tv power supply board problems,mean the tv it have a problems with it the main logic Tuner signal board problems,that is the board where the tv incomming broadcasting signal wire plug into it.Tries those websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish main logic Tuner signal board for the replacement.Because this main Logic Tuner signal board components are all in micro chips and are all in micro surfaces mounted on micro surfaces mounted on components parts by a circuits printed and put it on by machines.

Dec 03, 2011 | Televison & Video

1 Answer

Vizio VW42L went black screen, no sound could turn on but not off, with remote or on the side. Called a repairman, decided to purchase a new TV. Year gone by, plugged it in and it has worked for several...


Yes,the tv main Tuner signal board it is the problems and the causes it have intermittents shorts in sides.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish tv main Tuner signal boad for the replacement.

Jul 10, 2011 | Vizio 42 in. LCD TV

1 Answer

TV wont turn on. Screen Stays off, LED does not light up, Makes constant clicking sound Have unpluged TV from power point and replued back in, No change


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.....

Apr 02, 2011 | Televison & Video

2 Answers

Good day, my name is Gabi on Friday 18th March my Telefunken TV was strucked by lightning and is dead. I need the Technician who can fix it for me. regard Gabi Mazibuko, 072 443 7394 or 011 717 1224


Hello,

We don't stay in the same vicinity, so I don't know precisely where you can a tech to fix this problem for you. Our job here is to give you a DIY (Do It Yourself) solution.....

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.

Mar 22, 2011 | Televison & Video

1 Answer

Color issues with tv after replacing lamp. Tv


no this is a main board problem you would need to replace the main board of you tv

Oct 02, 2009 | Samsung HLT-5075S Television

4 Answers

Keeps turning off


It is likely you have a bad power supply which is quite common in newer tv's. Otherwise it is a problem with the main board. Either way it will have to be repaired and tested

Jun 18, 2009 | RCA TruFlat 27F520T 27" TV

1 Answer

Vizio 47" Costco hdtv has red floating areas!


After posting this problem we did call Vizio. They sent out a repairman (had to wait over a week) who fixed it by: Replacing the LVDS cable and the main board. (Just like somebody on this blog wrote somewhere!) We also had just previously called our cable company who came out (also free) and checked our system only to find the cable running around the house to the tv needed replacing as it was sending zillions of errors. The red flowing problem (called "red pixilation") was due to the Vizio LVDS cable and main board being faulty from the factory.
Just want you out there in web land to know how to get your similar problem fixed!

Jun 10, 2009 | Vizio VO47L 47 in. LCD TV

1 Answer

No picture


LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:

Symptom: No picture on screen but LCD TV still has sound.
Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound.
Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture
Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound
Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits
Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright
Solutions: The problem is cause by defective LCD Panel.It needs to be replace.

This is a power supply problem. Try to check the fuses ,fusable resistor ,capacitor and transistor in power supply board.

Hope it may help you;

Regards,
VOTIT

Oct 01, 2008 | Olevia LT37HVS 37 in. LCD HDTV

1 Answer

TV does not turn on/red led flashes 7 times in front


this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards

Aug 10, 2008 | Philips 42PF7320 42 in. EDTV-Ready Plasma...

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