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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
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 email@example.com "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.
Seven blinks = High voltage shutdown (overcurrent protection). The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits, otherwise send the TV to a workshop for a quote on likely parts and labour costs, then make a decision afterwards about whether it is economical to repair or not.
Usually it is either the flyback transformer, the tuning capacitors in the collector circuit of the horizontal output transistor(s) as well as the transistor(s) which could be faulty. These parts should be replaced at the same time.
Short-circuit horizontal output stage - hence the 7 blinks error code from the standby LED.
It is unuaual for the horizontal to go out, leaving a vertical line.
The vertical gets it's power from the horizontal circuit, so if the
hor. fails you should have nothing on the display. In this case it may
be as simple as the hor. connector to the yoke being burned and not
making a good connection. In any case I'm sure the circuitry is ok and
you should look for cracked solder joints and/or burned connections.
The shut down could be due to there being no hor. deflection, causing
the HV to go to high, causing the shutdown. You should check/replace
any capacitors that are bad, especially those around the HV shutdown
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.