Tv was playing and it started to flikker and then the picture was crammed into a small horisontal band of about 5cm high, i switched the tv off and on again, each time the picture band seems to get smaller, cannot find the scematic. any ideas of where i can check or what to look for .
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Re: logik lt2974 small picture
The problem is in the verticle section, if you are a technician check a verticle IC and a capacitor of that stage. to allocate a verticle stage follow 4 cables coming down from deflection coils, two of these wires goes near transformer, this is horizotal and the other two goes near an IC this is verticle. positive idea.
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Opeen the back panel of the tv,
near the coil you would see 6 potentometeres, (small turnng things) one is written vhold and and the other horizontal scroll, adjust these to set the picture,, Be careful nt to eletricute your self..
IF THAT FAILS THE PICTURE GETTING WIDER AND SMALLER CAN BE CAUSED BY EIGHTER THE COIL, HORISONTAL CIRCUIT OR VERTICAL CERCUIT.. most often its just a capicator.
NO VERTICAL DEFLECTION MEANS YOU HAVE A HORISONTAL BAR IN THE SCREEN?, Check the power supply for the correct voltage to the vertical circuit, check the vertical DRIVER circuit, check the conductivity of the YOKE (vertical winding) on the neck of the tube
if you have a VERTICAL bar in the screen (common mistake) check all of the above relating the HORISONTAL circuit
This problem is called blooming, and it is caused by poor High Voltage Regulation. It usually denotes a problem in the HV section of the TV. More then likely the problem is in the IHVT (Integrated High Voltage Transformer).
civilman, the first set has either no high voltage or is collapsed vertically, until someone checks for high voltage there is no concrete answer, the AV27730 is vertical collapse from your description, either the voltage to the vertical IC is missing or the vertical IC has failed, not a big deal cost-wise, hope this answers your questions, if not e-mail me back, good luck, BMW Rider
I would try adjusting the screen control on the flyback. The flyback can be easly located, find the red wire attached to the top of the picture tube & follow it down to the flyback. on the flyback you should find two controls, one screen & one focus. you sould be able to read the words above each control, only adjust the screen one. slightly increase the control till the picture stays on, if you turn it too much you will get small white lines going across the screen. Now if what i have told you fixes the set, then it is only a tempoary repair. could last days or mothes, maybe years. if it starts to happen again later the set will have to be replaced. this is a sign of the picture tube starting to get a weak. ALSO DO NOT PLAY WITH THE RED WIRE IT CARRES VERY HIGH VOLTAGES EVEN WHAN UNPLUGGED FOR DAYS.