Dec 6, 2014, 12:57 PM
Post #16 of 60
Sorry for delay, it was a lot of work, patience and lot of time.
Re: [Megatron] TELEFUNKEN PAL COLOR 2560 white horizontal lines on bright screen
[In reply to]
I have completely removed all solder joints with vacuum pump and resolder motherboard and everything pluged on motherboard such video PCB, PLL synthesizer with microcomputer for memory station PCB, then CRT PCB so everything what could cose the problem of cold solder joints is removed and there is no more blinking problem.
I bought the new video chip TDA 3562A and now when I turn down dimming the picture on G2 trimmer I can see the picture of TV station bearly in the dark and in colours which are not sharp and properly overlaping, actualy they are sharp but like blue and red shadows and there are still horizontal lines but stable and they are not moving at all. When the TV program has the bright scenes then you can see entire picture not only shadows. When you watch the film with white subtitles they are sharp and readable.
The voltage on the video chip TDA 3562A on output signal pins 13,15,17 are still the same 0,7V and on output RGB tranzistor area via RGB cable to CRT PCB still 89V instead 135-170V as it should be.
Any idea what could be failure?
(This post was edited by Megatron on Dec 6, 2014, 5:41 PM)