I have a five year old 28PW9527 with horizontal lines showing against a dark background. They are a bit less than an inch apart and don't go quite to the edges of the screen. They are whitish in colour, perhaps with a slight green tint. I have read that I should adjust the screen voltage and screen high voltage output. However, without a manual I'm reluctant to start. Can anyone advise how I can get hold of a manual, or exactly where these adjustment controls are inside the set?
Thanks in advance for any help.
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Re: 28PW9527 Retrace lines (?)
These adjustment controls are on the HT transformer. (Large plastic block on one corner of the main board - looks similat to a distributor cap on a car.) They are usually a plastic pot with a cross in the end to fit a flat blade screw driver. (This is the large blocks Philips TVs usually have three adjustments on the transformer:
Screen high voltage
If you can locate these controls on the transformer, make a slight adjustment to each in turn, noting where the control position is before adjustment, so you can put it back.
When you have found the right control it will go brighter or darker.
Before adjustment, set the TV brightness control to about mid way. Ideally the screen should have a completely black image to show up the scanlines.
Adjust the control until the scanlines disappear. Do not over-adjust or the screen will appear too dark.
TAKE GREAT CARE not to touch anything other than the control. HIGH VOLTAGES
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When you see lines like these across your LCD, it indicates a problem with your monitor's electrolytic capacitors.A faulty filter capacitor in the power supply board (SMPS board) can cause horizontal lines across your monitor screen.Horizontal screen lines are one of the most visible problems I see in LCD monitors & TV's that are 3-7 years old. It can happen as much from heat, humidity & less-than-ideal operating conditions, as it can from fluctuating current supply or manufacturing defects.
The way to repair horizontal screen lines is by removing the capacitors from the printed circuit board (PCB) and testing them with a LCR meter.
If it shows zero, there's your confirmation that the specific capacitor needs to be replaced.
now if you can replace them your welcome but i wont suggest that , cause you may break it more....!
any ways do comment if it helped you in any manner!
Please pull front speaker grill and find focus block, fixed at corner having 6 control knobs on it. Find Blue Screen control knob there. Put your TV in AV mode to get dark screen and just press Display button on remote to have AV display. Now
slightly rotate control knobs counter clock wise until thin lines
(retrace) disappear. Job is done and put back speaker grill, press
display button again to disappear screen display.
Check capicitor in vertical hold circuit. You should have solid knowledge of electronics repair before attemping repair. TV's can emmit harmful radiation, and produce voltages up to or in excess of 30kV.
Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.
Sounds like you are describing retrace lines that could indicate that your CRTs or something in the drive circuits are bad.. Check the resistors on the CRT sockets to see if they are in tolerance. If they are try turning the red and blue screen adjustments down just a little this should take the lines away. You will however be needing service in the not to far future. Turning the screens down should help if the resistors check out. Let me know if you need anything further.
Those are called retrace lines and they are the result of the blanking pulse not having the desired effect. This could denote a problem in the Horizontal section of the TV. In this case the green gun is not being turned off as it goes back to the left side of the screen.
Hi, I have a Philips 29PT9009/12 TV. Recently I have begun to see horizontal green lines on my tv, when either watching a dvd or watch tv. This has gotten worse and now the green lines are more visible and the background is now turned a shaded green. Please help me. Thanks in advance
they gona get worse to dead circuit, a small capacitor (problably in the neck board) is bothering you, get a tech now that he can see the problem, gonna be cheaper now....good luck
ps some times the picture say to the tech was going on