Mr. Nice; I have a Sony KV32XBR400 TV which has worked flawlessly since we purchased it in late 2000, until the last few days. Randomly, it will now not display any video, but the sound works fine and the channels can be changed successfully, there is simply no image. Last Thursday is when the problem first appeared. I moved the TV and removed the back and carefully cleaned out the dust from the circuit boards, but I couldn't get it to display any video. I unplugged the unit Friday night and turned it on Saturday morning with the main power switch, not the remote, and the video came up properly. I let the tv play for an hour or so and turned it off with the remote; I them immediately turned it back on and put it in "screen test" mode, based on the service manual. The video came up properly and the self-diagnostic screen displayed all zeros (0) for +B OCP, +B OVP, V Stop, AKB, LOWB, H-STOP and WDT faults. I turned the unit off to quit/clear the self-diagnostic screen and then back on and I got good video. I left the set on all day and it worked normally. Sunday I turned it back on with the remote and it worked properly; I left it on all day. This morning, Monday, I tried to turn it on with the remote and the video would not come up, but again the sound was okay. I've tried turning it on several times during the day and it won't "light" up. Because the diagnostic test looked good, is there a chance there's a high voltage relay that aperiodically isn't closing to allow voltage to the tube? I read one of your repair solutions for a somewhat similar problem where you suggested changing one or two IC's, would that be a possible solution for my set? As I mentioned, I have the Sony service manual. If you can give me some repair suggestions, I would very much appreciate it; the TV has had an excellent picture so I really don't want to replace it.
Thanks in advance, sorry for the long note but I wanted to describe the problem and the diagnostics I've been able to run.
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Re: Sony KV32XBR400 Video Won't Turn
Since this is a Sony TV, if there is a problem with it.
It normally indicates with a code.
I mean, does the standby LED blink?
If so, how many times does it blink?
Its a code which you can check with Sony to find out what might have gone wrong...
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The clicking you are hearing was probably always there, it's just that when something goes awry, one pays closer attention.
What you hear is probably a relay that connects power to the rest of the set.
Since our sets can respond to a remote, they always have a little bit of life to supply power to the infra-red receiver so it can respond when 'off.'
I see two possibilities; the relay itself has burned contacts and not always 'closing' as it should, or, the high voltage circuit is failing to turn on as it should causing an excessive current to flow for a moment and a protective circuit to trip and disconnect the power from the main supply.
It probably will get worse if the problem is not found and could damage other circuitry as well.
Good luck finding a TV repair man who isn't deceased or out of business but I do recommend you try to have it repaired.
Once repaired, it will outlast most any panel/flat screen-type TV as it appears nearly all of them are failing much too early in life.
You can check by entering just "LCD," "plasma" or "projection" plus TV in the search window here.
Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505
Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.
and some times the eprom ic is fulty ...
try to unplug your tv from the main power for 5 hours then press the power button and keep pressing for 7 seconds then release ,if this do not work ,you should take your tv to a qualified person
It definitely does not seem to be a problem with the Picture Tube. More like a cold solder. It is definitley not a job for a layman. Also, get a good technician to have a look, as locating cold solders is a labourous and time consuming process. It could also be possible that the main DC filter capacitor is getting dry, and may require replacement.