Question about JVC AV-K29MX1U 29" TV

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Progressive power up problem

Hi Guys. I am in S.Africa (PAL) and have a JVC AV-K29MX1. I mention that as the model is slightly different to that on the site and I don't know if it has any relevance. About 6 weeks ago, the TV started playing up when trying to turn it on. If turned off with the remote, the green light would go out and the red LED would stay on (front panel) Turning on with the remote worked fine. The problem started when the mains power to the TV was cut off due to a few short power outages. During the first one, the TV was only off for about a minute. It turned on with no problems. However in a subsequent outage, the TV was off for a few minutes and when I pressed the power button on the front of the TV, the red LED came on, the green LED then came on momentarily and then both "faded" off ... like a capactor discharging. Pressing the power button on/off continuously for a few minutes resulted in the green LED staying on for longer and longer until eventually the TV "fired up" and work fined ... until the mains power went off, and if odd for more than a few minutes, the entire process had to be repeated to get it going again Progresively, things got worse though. Eventually, when turing the TV off with the remote, even though the red LED on the front panel would stay on, when the remote was used to try turn on the TV again, the green LED would come on momentarily and then both would "fade" off as above. Using the previous "method" of repeatedly switching the power button on the TV, eventually we could get it going though. Eventually last week, even that would not work and as I suspected that heat (or lack of it) in a faulty component might be a factor in preventing it from getting the power going, I tried blowing hot air with a hair dryer into the air vents of the TV case (bottom right when viewed from front). This allowed me to get the TV going again. The "hot air" was directed in the general vicintity of the large black capacitor on the power section of the chassis. This particular model has a "diagnostic" routine which checks various functions of the TV prior to start up. If any are found, a yellow LED flashes on the front panel (next to the red and green led's for power) and the TV won't start. At no time in any of the above did the yellow light ever come on. Now, when trying to turn the TV on, NO LED's come on and it only makes a faint clicking sound. I had the flyback transformer replaced about 6 months back, so I don't know if it could be that ... also, even though the flyback transformer needed replacing, the red power LED would still come on and only then the yellow LED indicating a fault. Any ideas ?

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  • Steve Wayne Jun 14, 2006

    Thx for the info techman!!

    I suspected a cap was at fault.I'll pull the likely culprit out and test/replace it. If you are right and other components are also gone then that won't fix the problem. In that case I'll send the set in for repair as I have very limited time and no testing gear here other than a DMM.

    Thx also for the voltage warning. Whilst not an electronics wiz myself, as a Sound Engineer I do have a little "electronics" experience, including getting zapped by one of the monitor/Chassis's I assembled (and forgot to connect the earth strap on) for a video wall some years back :-(

    So, I'll make sure to stay clear of the big red wire with the rubber cap going into the CRT when I remove /replace the capacitor . I DEFINATELY won't stick a screwdriver under the rubber cap to remove the lead from the CRT, especially not if the earth strap/discharge ciruitry is not connected and I absolutely, most certainly will NOT let my finger touch the metal of the screwdriver

    Yep ... I know .... my actions were shocking!!



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Yeppers. Sounds like the standby power supply has a bad capacitor in it and the regulator Ic is defective. These parts should only be replaced by quilified technician as there is very high voltage inside these sets. Good Luck

Posted on Jun 14, 2006

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I have a JVC AV-K29MX1 and when I switch it on the picture starts shrinking vertically and it eventually switches off with auto timer and the orange led starts flashing. Could you please assist me with this problem. I have found a diode part no ISS 133-T2 close to the vertical output IC that seems to have overheated along with a couple of resistors. The problem is that I can not find this diode anywhere. Could I perhaps replace this diode with another replacement value?


Posted on Jul 30, 2011


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