JVC AV-36F802 Shuts off after turning on, then red timer on light flashes.
This set started out with a few white horizontal lines across the top of the screen and then over time the number of lines increased until there was about 6 or 7 inches of them across the top of the screen. Then one day the set was turned on and it shut itself off, next the red timer on light started flashing steadily. I tried unplugging it for a day and then plugging it back in to reset it, to no avail. Now all it does is shut itself off when plugged in and the red timer light flashes. My wife said it had shut itself off in the past.
I am pretty good with electronics and would appreciate any help pointing me in the right direction. Not sure if the set has one problem of two. If you could suggest component(s) to check and or an area of the circuit board I would be very grateful.
thanks in advance :-)
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Re: JVC AV-36F802 Shuts off after turning on, then red...
You are describing Vertical sweep failure.
It will be an I.C. with a part number that probably starts with an LA_
_ _ _ and be on a heat sink in the vicinity of the connector
going up to the yoke. Try replacing that. But first, check
all the electrolytic caps around it for testing dry (sorry - takes a
special meter to do it in circuit) or just replace them. May have
lost power to the I.C. as well. Look the I.C. up in the
free NTE cross reference at nteinc.com Get a diagram of its pinout to
find what pins the power and outputs are on.
Hope ya fix it!
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It sounds as though you can see Transmission lines which are sent out with any broadcast at the top of an image, The TV should normally blank these out, i suggest checking your horizontal and vertical settings
it could be an electrolytic capacitor or the vertical output I.C. in the vertical circuitry,if you remove the rear cover tap on the board in different places and see if the picture fills out or atleast jitters like it might fill out,then it could be just a cold solder joint,then remove the main board and resolder all joints and this should repair the condition you have
Any malfunction associated with a flashing light usually indicates a
circuit problem or defective component. Unfortunately, the days of
taking off the back cover of your TV and replacing a defective tube or
fuse are long gone. Proper servicing will require troubleshooting
procedures that can only be performed by a qualified electronic repair
facility or professional television repair person. Ask for an estimate
and a realistic appraisal of whether the set can be adequately fixed.
Depending on the age and condition of your TV it may not be cost
effective to repair.
The faint white lines at the top of the screen is the warning that the pump-up capacitor in the vertical output circuit is going bad and the output itself is about to short out. When the TV stops working, the vertical output IC has finally shorted out. Replacing the vertical output IC, the pump-up capacitor and possibly a small value resistor next to the flyback (B+ for the v-out) should bring the set back to life.
It sounds like a vertical deflection problem. You mentioned you had a white HORIZONTAL LINE in the middle of the screen. If this line runs from left to right across the screen it's in Verticla deflection. If it runs from top to bottom, it's in Horizontal deflection. I am assuming the problem is a Vertical deflaecion problem. The repairs necessary are most likley to replace the vertical capacitors or the verticla deflection chip.
NC Electronic Mills, Wyo USA
do you see a horizantal line across the screen before the set goes off. if you do, you have a problem with the virtical ic. it has to be changed. let me know if you see the line across the screen and I will show you what to do