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Tv came in shop with shot down problem ,checks were made and a resister for the vertical supply was open..after replacing , set come on only with insufficiant vertical sweep at top and bottom.. am at my wits to know what is the solution? changed all filter caps yet no solution..

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Have you checked all the solder terminals of the vertical output IC, for any loose contacts? Check it. Re-solder all the suspected solder terminals by applying a little more solder. Check all the low value capacitors at the vertical output section circuit. Replace all of it at once, with same capacitance and voltage ratings. If these do not help you, have to enter its service mode option to adjust the vertical height, linearity etc: By the way, what is the brand name to your TV? What is the number of IC used as vertical scan output. For more information: http://electronicshelponline.blogspot.com/

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

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SOURCE: LG vertical failiure vertical line at the bottom of the crt

replace the vertical driver ic and the proccesor ic

Posted on Nov 25, 2008

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Show horizontal line.i replaced the ic checked all resistance & fuses but still fault is there


good day sir
if you already replace a new vertical I.C. there's a problem with the supply of your I.C. 24v dc.
I give you some steps for D.I.Y. troubleshooting
first,remove the cover of your TV loosening all screw at the back
secondly,look for the part number of the vertical I.C
thirdly,click this site to identify the pin connection of the I.C to determine the supply.
http://www.alldatasheet.com/
next,type the part number of I.C.then go down and click the view P.D.F...after that,click download to view... adobe reader is needed to download and see files.its free
fourthly,after you see the pin configuration, check the supply voltage of I.C 24vdc..if the supply is too low or totally dead,check the print line of PCB to find where the supply came from its usually found on secondary of fly-back..check all resistor and diode near to the secondary of fly-back
and finally if done all process replace a new spare parts if you found the defective one
thank you and good luck

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1 Answer

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well you should have your adjustment checked,,
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more than likely is an asjustment problem, just open it up and look for the controlls and try adjusting it your self, if your unable to do this take it to a local technician

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On power up I hold the power button down, I can hear some sort of relay kick-on, sometimes a horizontal white line appears across the screen, then it kicks-off, and the red led blinks four times...


Hi,
White line across the screen indicates that tv got vertical deflection failure problem that may be due to vertical output chip failure. If that kind of problem occurred, tv select protection mode and red light starts blinking 4 times.
Please check vertical output chip in tv main board and replace it to solve tv issue. This job needs soldering work so local tv repair shop will help you.
Thanks.

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1.In this case the problem is usually found in the high voltage power supply.Most probably is the vertical IC defect.
Warning : This procedure has to be done by an expert.It is risky and can cause death to those who dont have knowledge in repairing.
A.) Open the unit and try adjusting the screen variable found in the flyback transformer. Notice any pattern on the screen of your tv.If their is a horizontal white line on the screen the defect is the vertical IC,replacing it can remedy the problem. Also check the 24v supply of the vertical IC coming from the flyback transformer.If their is no 24v get the resistance of the fuseable resistor and rectifier diode.Usually the resistor opens and the diode create short circuit.
B.)For most, make sure that their is no loss contact or cold solder on the board.

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Ok if your hitachi TV dies with no power anywhere try this:
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2 Answers

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Sounds like something is getting hot causing voltage loss or drive pulse loss to the vertical IC. Maybe you have a bad solder joint. Try tapping the circuit board around the vertical section. A capacitor could be heating and opening up. Stargazer Also you might try using circuit cooler spray and make the problem show up.

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