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Your tv set may have a short circuit both in the power supply and horizontal output stage. The first approach I suggest is to check the rectifier fast diode in the line supply (90/100V) for short. This model is prone to burn this component and may be associated with some problem in the horizontal output or even in the RGB output. I would like to point out that this task require a technician as should be supported with a schematic of this model. If this is helpful, I shall be glad. Sully
Since you changed the flyback did anything change? If not, you may want to take a close look at the horizontal peaking caps or the horizontal electroltic capacitor. I hope this helps. If I can help any more, email me at firstname.lastname@example.org "Original Radio Man" Ed
It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.
code 12 means the set isnt experiencing any shutdown symptons. I would check for more capacitors in the same circuit where you found the other often they show no visible sign of deterioration. If you need a service manual to figure out which capacitors are in that same circuit you can get the manbual for your set for 10.99 at the following link. They will even email it to you if you go back to the site and let them know you want it emailed. heres the link hope it helps. http://servicemanuals.vstore.ca/
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
Severe vertical jitter on picture, horizontal sides of picture ragged
Replacing the TDA4950 cured the fault
White line down centre of screen (top to bottom}
I recently had my phillips 27" model
27PT6341/07 repaired after warranty expired due to white lines
appearing at the top of the screen. The shop advised that it was a
capacitor giving me the problem. So, after getting it back, I examined
the repair job and the shop had replaced a capacitor at the back of the
main board, next to the rear rca inputs. It is labeled 10uf 100v. I was
told that it would fail again soon because it is a manufactures defect.
For me it is at location 2465. Here are a couple of photos of the part. http://farm4.static.flickr.com/3215/2337629026_eaa30cfa18.jpg?v=0
You might have a cap that shorts after it heats up causing your problem.
The whinning sound you hear sounds like the power supply has a short on it.
Usually when this happens though, it doesn't go away until some part such as the horizontal output transistor is replaced.
RCA's are notorious for flybacks shorting and then shorting the horizontal output transistor.
Your flyback may be shorting intermittently.