JVC 32" TV timer lite blinks

[TA7205]

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

 

[john]

Was the TV working OK before it was dropped ?
If yes it still has cracked board .

kip

 

[RonKZ650]

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.

 

[James254]

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

 

[TA7205]

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