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Tube TVs
LGfs4rk TV color spots on power up
hace 5 años
hace 5 años
Hi Tayaxin, you do not define the question well, in tube TVs, if the screen comes out with colors, it is magnetized, the fault could be the demagnetizing coils or as surely as the PTC is a three-legged piece that there is in the power supply
22.858
hace 5 años
hace 5 años
When requesting information be specific with what you want to correctly contribute the data of the TV as a model and chassis, in this case it provides an incomplete model, I send you a 21-inch TV diagram, if it is bigger, comment it, check what they indicate, integrated vertical, if this integrated is damaged it can cause this fault, in this case lower the screen a little and do not have much time on the TV, since the kinescope can degoy ... greetings.
lg_21fu4rlg_21fu4rlg-ls_chassis_mc-059c-sm.pdf [4.09MB]
lg_21fu4rlg_21fu4rlg-ls_chassis_mc-059c-sm.pdf [4.09MB]
46.781
hace 5 años
hace 5 años
Being with that defect do not keep the TV on for a long time., Preferably remove the vertical IC from the circuit and check the presence of its working voltage
Make sure the good condition of the polarization components and surroundings of the verticala IC in addition to the rectification and filtering components that feed said IC. Change the vertical IC ..
Strictly and fully checked the suggestions left on the vertical stage, and the problem persists .....,
Change the socket (socket) on the board that connects to the TRC
46.781
hace 5 años
That's right, the characteristic horizontal stripe will come out, but avoid the possible "breakdown" of the .TRC
46.781
hace 5 años
There are high probabilities but for safety you must change it, after thorough review of your work components around you, those of your power supply and the yoke
46.781
hace 5 años
The yoke is tested by measuring its impedance (ohmiaje) and that it is not "short."
Approximately it is always over an impedance of 12 ohm
22.858
hace 5 años
if it is in the whole screen it is because the screen is not adjusted properly, lower it a little, if it is only in one part if they are filters, especially change the c304 100micros 50v
37
hace 5 años
hace 5 años
ready colleagues the solution was to change the vertical ic a c304 and apparently it remains the same with black lines after 3 minutes k were increasing that was x excessive heat in the vertical ic what is a suggestion in a friend I put a Micro fan to the heatsink so keep it below excessive temperature. and the tube is on all day and everything is going well. Or the other option is to put a larger heatsink.
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