Question about JVC AV-27432 27" TV

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Re; Model # AV27765

IC 101 will not produce horizontal drive. Screen is rotating to right. Can you tell me which pin and waht voltage should be on the IC 101 circuit?

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Re: Re; Model # AV27765

Wait one second here if the ic wasent producing horiz drive you wouldny be getting any picture.. Your saying the set is floating the picture side ways?? your gonna need a scope to see where your losing the horizotal sync pulse from my friend.. No insult intended but if you have no horizontal drive there would be no High voltage therefore no picture.

Posted on Apr 02, 2006

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Where is horizontal scan out put section?

Hi Majid
Just contact any service technician to repair your TV. It will be best for you.
Gopakumar Gopalan Google

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Where is horizontal output ic in my t.v?

There is no horizontal oscillator IC. The horizontal oscillation is generated and outputted by the main system control IC LA76810 itself. Refer some circuit diagrams using LA76810 to get more details about the horizontal oscillation output from the IC. Measure the frequency at that output pin. It should be some ever near 15.62KHz.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
Type in the IC number, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.

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Toshiba 24af45 horizontal

If rolling in a right to left and not up down it is a sync problem--horizontal sync comes from one of two places in general---a pulse off the high voltage transformer or directly off of what is called in the trade the Jungle IC.

That is not a joke--Most of these sets use a large IC (63 pins or more not unusual) that contains: color, video, vertical drive, ABL and much more---so much is crammed into that chip it decades ago was named the Jungle for clear reasons.

A schematic and or scope may be needed to trace and find what is bad.

if off the high voltage transformer (more common in old sets than new ones) it will be a open resistor.

If at the jungle you would have to go to the pin with the sync and follow it out to see if none at source or if lost somewhere down the stream.

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1 Answer

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You're either losing high voltage or power supply is not producing the horizontal drive signal, Check for 130v on the collector of the horizontal output transistor, if you're missing your voltage, you have a power supply problem. If voltage is too high you have something open in the power supply such as a low value resistor. If its low, something is shorted in power supply, possibly voltage regulator ic.

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1 Answer

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In your TV, now the sound will be ok, I thinks so, and posts this solution.

You just open your tv, and locate the vertical output section in the circuit board. It is very easy to findout. Just see the four wires goes from the deflection yoke [the coil fitted at the neck of the picture tube], there will be four of them, out of which two of them will be thick, usually red and blue coloured, and another two of them will be thin. You just follow the two thin wires, which in turn goes to a plug in adaptor and to the circuit board. Just put the circuit board upside down and follow the two tracks undeneath, which will guide you to the vertical output section.
There you can see an IC screwed onto a metal heatsink. That is the vertical output IC. Just check keenly for any loose solderings on the legs of that Ic. It may happen because, this Ic will heat up when the set works. Prolonged times of heating and cooling may make loose solderings or bad solderings. It is very difficult to locate the exact loose point because some of them may have micro type loose contacts, that can't be detected with naked eye.
You just resolder all the legs of that Ic, by applying a little more solder, without shor circuiting the terminals. Chek whether you have rectified the problem or not. If not check the main supply point leg voltage. If there is no voltage follow the track and find out the fault. If there is voltage, check the voltage at the output pin of that Ic. It must be somewhat half to that of its supply voltage. If main voltage is there, and there is no voltage on the output pin, or that voltage is equal to that of supply voltage, the vertical output IC is defective. Resolder it out from the board and go for a same type and number. Replacing it will solve your problem. There is an other rare chance to get the vertical windings in the deflection yoke to open. Bu it isvery rare, out of 1/1000 of it may happen. It can be checked by continuity measuring of that coins winding ends.
You just go with confidence. Take every precautions we take before working with an electrical equipment. Proceed. You can and you will. Take care. OK.

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1 Answer

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Most common is IC fault.

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2 Answers

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It depends what part was damaged in Horizontal section. Here in Philippines labor costs for this size of TV is ranging from $50 to $150.

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1 Answer

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hi there, one horizontal line means a vertical section prob., check some resistor with low value and a defective diode, possible ic part is defective. do some test and check up. ty

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2 Answers


The 8V at pin 36 won't show unless there is oscillation, the primary voltage pin is pin 10, 8v. Don't mind me asking, you have checked the B+, right? Because the blinking LED is often because of power supply problems. And if that's okay, desolder the horizontal driver output legs and connect an LED to find if it is oscillating, if it does, forget the ic part and move on with the FBT and things. Good luck.

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