The set is a 29"CRT TV, model 29PT5683/69 its about 7 years old. The problem is the set produces only blue retrace lines.
However the sound is fine. Mute, increase, decrease volume all works fine. Monitor out into another TV produces picture.
I've checked most components on the CRT neck board. 200V is preset at this board. The RGB amplifier chip TDA6107 has been replaced.
RGB signals to TDA8844 has been bypassed with capasitors and picture was available, but upon removal of the caps. only retrace line like the picture is available. Reinstalling the capasitors again produces only the retrace lines. TDA8844 has been replaced with no improvement. High voltage from the flyback is about 30.57KV.
Any idea what else could be the problem based in the pictures posted? Thanks.