We have a Hitachi 42PMA300A and the screen is full of coloured vertical lines. Sound is ok but no picture other than the coloured lines. Can you please help?
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normally the 19" resolution can support up to 1280*1024, but if it comes with vertical lines in full screen, it might indicate the panel is no longer to work and probably it's time to replace new one.
Most LCD monitors have a default refresh rate of 60 Hz. Older monitors also have limited resolution. Please check your display settings and ensure you're not using a refresh rate higher than 60, or a resolution higher than what it supports. If either one is the case, you're lucky the LCD still works.
The problelm is a
defective vertical deflection system. Could be the amplifier, vertical
output driver or whole printed board that supports the vertical
deflection activity. It is considered to be a serious failure. The cost of repair will be around $200 to $300.
I have a TV at work that has been doing the same thing here's how I've been getting it to show a picture:
turn the TV on then quickly change it to an input channel (like front or etc) that doesn't have anything connected to it. Let it sit there for a few minutes, then change it to a regular channel and see if you have a picture.
Could be a loose connection on the printed circuit board in the Vertical deflection circuit.
You would have to have a qualified technician to repair this problem.
A intermittent connection in the circuit described can cause a horizonal line across the screen.
You have to be careful and not leave the TV on for a period of time with a bright line, as it can actually burn a line on the CRT screens, which is permanent.
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
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White line down centre of screen (top to bottom}
Replace C805
Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback
lines, frame ok. I detected two badly soldered double diode rectifiers
in the secondary part of the power supply ! I checked all other joints,
and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok
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