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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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JVC 32" TV timer lite blinks
Hi;
This AV-32F704 was dropped initially. Repaired PCB cracks, now unit turns on, shuts down after 5 seconds and timer lite blinks once a second. Is that a diagnostic code ? There's HV, but no sound or pix. There's a white flash and you see a raster collapse when it shuts down. Thanks very much, Rick |
#2
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Was the TV working OK before it was dropped ?
If yes it still has cracked board . kip |
#3
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My guess is you don't have vertical deflection. Put a meter or scope on the
vertical wiring to the yoke and make sure you have vertical sweep present on one of the wires and not the other. Probably still have a crack. They can be elusive. |
#4
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"TA7205" wrote in message
... Hi; This AV-32F704 was dropped initially. Repaired PCB cracks, now unit turns on, shuts down after 5 seconds and timer lite blinks once a second. Is that a diagnostic code ? There's HV, but no sound or pix. There's a white flash and you see a raster collapse when it shuts down. Thanks very much, Rick Hi Rick, Almost certainly the unit is going into protection mode. I am not familiar with your model as it's for the US market only. But I have seen this before with JVC. It is a common practice for JVC TV's to go back into stand-by when a problem is detected, usually with the LED blinking at 1 second or 1/4 second intervals, depending on the model and the number of protection circuits. Usually it is not possible to switch the unit back on, you must unplug the power cord, wait a short time then plug the cord back in again. This is a very good indication protection circuit thinks something is wrong! I suggest you look for cracks around the high voltage transformer. Pay special attention to the fine tracks on the PCB, some of these lines are used for x-ray protection. James -- Please Note - E-mail address corrupt. Please change "NO" to "ii" |
#5
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Thanks for your help on this one.
I did find a good vertical signal at the yolk (only one wire) Also, The micro is running. It has 12V, 9V and 5V supplies running. It's got HV, so I know the horizontal is working. I've scoured this board with a fine tooth comb looking for hidden fractures. I'll keep working on it. Thanks again, Rick |
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