Question about Sony BRAVIA Televison & Video

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Sony Bravia KDL 75 white indicator light cycles bright to brighter to bright then off. repeat.. screen is black and unresponsive. ON/OFF won't work. Have cycled pwr and tried factory reset.

I would try replacing a circuit board but one guy on line said that he replaced all the circuit boards sequentially to no avail. Thoughts?

Posted by Dane Lacey on


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City View TV & Computer, Inc.

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  • 450 Answers

In most of the case, the main board is defective.

Posted on May 09, 2019


5 Related Answers



  • 157 Answers

SOURCE: My Bravia KDL-40S4100 lost all 3 of it's HDMI

There is a problem with the processor. The only way to resolve this issue is to replace the main board. It is called the A board in your TV.

There are two for this model and the correct one will depend on what your serial number is.

Part numbers are as follows:
part # 185709211 for Serial #
1,000,001 - 1,350,000
1,700,001 - 1,750,000
1,800,001 - 1,804,270
1,804,271 - 1,818,372
1,818,373 - 1,830,000
list price: $504.87 core charge: $680.00

part # 185709231 for all other serial numbers
list price: $505.87 core charge: $600.00

Posted on Nov 09, 2009

Testimonial: "Thanks, Now I wonder who all shares the same problem and if Sony is willing to do something about their defective products..."



  • 53 Answers

SOURCE: 40xbr2 bravia kdl sony LCD tv. The screen shuts

Problems relating to the automatic turn on and turn off of a set like this usually point to the main board being an issue. For this set, I believe Sony refers to that board as the "AU" board.

It's probably not the G/Power Supply board, especially if it turns itself on. Power supplies will turn a set off, but rarely--rarely--turn itself on.

If there's no kind of extended warranty involved here,
you could be looking at $500.00 for parts and labor to repair this kind of problem.

As always, try any software/firmware updates Sony might have available on their website prior to pursuing a repair visit.

Posted on Jan 22, 2010


Bud Martin

  • 11361 Answers

SOURCE: Bravia kdl-40s4100 has no sound, no picture.

Since you have no picture or sound, then more likely to be power supply or main board problem, so check the power supply output voltages first, shorted out backlight inverter board will also cause the power supply to shutdown also, so try disconnecting the inverter from the power supply board to see if the power supply will start back up and at least get the sound back.
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:

Posted on Jul 15, 2010


  • 115 Answers

SOURCE: Left half of my TV screen is completely white

That is only available to Sony authorized servicers. See

Posted on Jul 31, 2010


  • 184 Answers

SOURCE: I have two sets of



Take care in solving the problem...

Posted on Aug 06, 2011

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Could my tv have a possible backlight inverter 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.
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.

Feb 29, 2016 | Televison & Video

1 Answer

The screen will get extremely dark (sometimes a dark red or green) and will flicker on occasion as if it's trying to fix itself.

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.
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.

Jul 09, 2015 | Televison & Video

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My washer dryer won't switch on

If the repair guy tested the machine, and determined that the Main Circuit Board is bad, this will cause the machine to not come on. Replace the Main Circuit Board and you should be good to go.

I’m happy to help further over the phone at

Oct 30, 2011 | Washing Machines

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I own a built in Maytag UMC5100ABD that was diagnosed as needing a new circuit board, the repair guys flaked and never ordered the board or couldn't get one, is there a replacement model that would use the...

Model UMC5100ADB Maybe?

The board part number is 58001210.

It looks like these boards are no longer available, but we can usually repair most microwave control boards with out $39.95 service. Details are here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Circuit breaker kicked now no power to tv tryed unplugging and waiting a while. no good. this has happened b4 a guy at cust service told me how to fix it. it worked.that was awhile ago and ive forgotten....

Replace power supply board that is defective and tv is not getting power to get turn On.
Required board is available with
Power board replacement is an easy job for handy person.

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3 Answers

Norcold refrigerator burner will not stay lit. Ignitor lights the gas, but as soon as it the ignitor stops, the flame goes out. Thanks.

u need to replace the thermocuple or be sure its near the pilot also be sure to blow out any and all dust in that area

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Electrics not working Guy said circuit board gone - needs new one for 200 USD Can circuit boards be repaired?

depends- is it new enough to be worth spending the money? top load or front load? out of warranty? does 200 usd include labour? could contact manufacturer and find if a re-furbished board is available for a lesser price.
could you replace the board yourself??
also consider- is there an on-board fuse that could be replaced? and- what caused the failure? bad component on board- or a fault somewhere else in the machine? if the machine otherwise has been dependable, and would cost 8-900 usd to replace, then do the math. if it's getting a little 'long in the tooth', may want to replace it! times are tight, i know!!
may try finding a newer used machine with some kind of limited warranty (30-60 days). do on-line check for reliability ratings.
good luck!

Oct 14, 2009 | Washing Machines

2 Answers

Fridge and freezer stopped working.Power still on (light on in fridge). Digital control for fridge and freezer shows straight line no numbers. Any suggestions?

The double dashes in your display are for one of two reasons. First situation would be would be "you turned the unit off". Press the up arrow on the feezer or fresh food control until a 4 is in each display. Second, if the control is locked out, the board has been scrambled or failed possibly from a power surge. Unplug unit for 30 seconds, and plug it back in and try to set control's for "4". If controls are still locked out, the board (12868513) needs to be replaced.

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Black line in center of screen

These black lines on the plasma screens are very fixable.  There is a dry solder joint on a circuit board at the bottom of the plasma that needs resoldered.  There are 6 or 7 "ribbons" along the bottom of the screen that correspond to vertical sections of the display, so you just follow the black vertical line down to figure out which one is faulty.  I just performed this fix successfully on my first attempt on a Gateway plasma, but it will work on most plasma's, specifically Hitachi, gateway, LG, Hyundai, & Akai. I think they may all have LG boards, my gateway did.
I can't really describe very well what to do, but I assure you it is fixable.  If anyone is near nashville, I might be able to help you out.  My email is [email protected]

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