I have a 27 inch

Jul 14, 2008

- does the thin strip change size?

Jul 14, 2008

- it shud be a convergence problem..ie.if the strip does not change size

Jul 14, 2008

- or the horizontal line is a "collapse of field" and is usually caused by a dry solder joint, be very careful if you attempt a repair yourself (if you can find the suspect solder joint) because extremely high voltages are in certain areas of the circuit, especially in the line output stage. i suggest u get the help of a professional

Thanks for using Fixya

Jul 14, 2008

- Find the location of the IC# 401 with the following markings: LA78041

Jul 14, 2008

- The mention lines of your TV can't no be adjusted using the remote or any other adjustments will work until the defective parts have been replace.
This might not be a DIY due to the danger of working with high voltage device such as TVs. High voltages are in excess of 32KV.

Jul 14, 2008

- If the 25v is missing there is usually a fault in the chip, which blows the protecting resistor which takes the power from the loptx.
so follow the print back from the chip/diode to the loptx pins, and test all the small fusible resistors on the way, and replace as required.
If the 25v is ok its usually just the chip or no drive from timebase chip.
if the 25v is low and the chip is warm/hot then the chip is duff
whilst doing all this pcb track following check for bad joints.
If the 25v is ok then we need to look at the field_timebase_chip supplies (usually +12v)
Finding this chip can be fun, I usually guess, and test all the pins and find none have power, so then I go back to power supply or line derived power, and look for regulators

After repair leave it run for a few minutes and switch off and see if its getting hot,
if it is, there is something else wrong.
check/replace the electrolytic caps nearby and make sure the supply voltage is not too high (25v is usual)

if the line across is wavy then check the field scan coils for open circuit (right back to the plug)

Jul 14, 2008

- Take out the comb filter and replace the surface mount electrolytic capacitors (I think there were around 4 of them) on the comb filter and put it back in the motherboard.

Replace the electrolytic capacitors in the power supply section.

start with replacing (2) 860uf 180v caps just after the bridge rectifier and continue along the circuit.
Some (15) or so capacitors later, it will finally clear the the horizontal bars and lines

thank you sir

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have a great day