Question about Sony Bravia KDL-42V4100 42 in. LCD TV

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Dead set no standby light power ok up to

Dead set no standby light power ok up to relay.

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  • Sony Master
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Your set might have an internal, user replaceable fuse; it would be worthwhile to remove the back panel after allowing the set to sit unplugged for several hours or overnight, then check for a board that seems related to the AC cable. If you can locate this, check for a fuse that is removeable without desoldering anything. Fuses can die from metal fatigue (flexing and shrinking as power is applied or removed) and replacing a fuse once is OK. If it blows a second fuse, then it's time to find competent technical help or consider replacing the main power board on speculation. This board is normally separate and likely easy to remove. Check with Sony to find if they have a repair program or what the cost of replacement is if they don't repair them. If you can accomplish this on your own, expect $75-$150 US. If you will need a tech to do the repair, add another $100-$150 to the parts cost.

Posted on Jun 23, 2009

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  • Contributor
  • 14 Answers

Could be anything! From a main board to a power supply. I recommend getting service on it from a authorized sony service center. If standby light doesn't appear at all for any given time, then it maybe the power supply.

Posted on Jun 23, 2009

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Hi David, If you you're not getting a standby by light, then it sounds like the main fuse on the power supply is blown.

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Amber light on means standby voltage is high. IF amber light does not go white when power button is pushed the its one of two things.
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Continue to check--every set has a standby power supply that powers the remote circuit to turn set on and it runs 7/24 if set is plugged in.

Never a good idea to turn set of by taking the AC away--it can cause micro problems(micro processor).

The standby will provide voltage to the micro (low like 3-5 volts) and if a mechanical relay is there it also supplies it.

if NOTHING try to isolate that area in the main supply as they usually combine the standby in with the main power supply.

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Worst case if problem is in standby you may have got the eprom or the micro when this happened

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check the power cable first. also the power at the wall out lets.
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1 Answer

My set just stopped working no red light, no green light, no sound. I have checked the plugs and they are ok. It is about 4 years old.


It has dead power supply.
Check the power supply; look for bad caps with leaking/bulging tops, check to see if you have standby +5vdc at the power supply connector, the front red indicator will not be on if you do not have this +5vdc standby voltage due to shorted out Q7 and ZD4.
See pictures here: http://s807.photobucket.com/albums/yy352/budm/Protron%20PLTV%203250/

Power supply: http://www.google.com/products?rlz=1T4GGIH_enUS282US283&q=pltv+3250+power+supply&um=1&ie=UTF-8&ei=9lIDTL7XO4fcM7HA-Ds&sa=X&oi=product_result_group&ct=title&resnum=1&ved=0CCgQrQQwAA

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