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Tube TVs
colleagues good afternoon ... sharp tv moves the image towards rriba
hace 5 años
hace 5 años
Thanks in advance for the help you can give me
model ... 20lg30
chassis ... cmkmp3x
the image moves from bottom to top and so it passes, and I changed the filters around vertical, the chroma, the two crystals and nothing, the fault that brought was vertical line I touched up welding and opened vertical but with this failure,
1.957
hace 5 años
hace 5 años
Greetings friend if the tv has dvd inputs test if the video behaves in the same way to rule out channel selector failure ... says that I already change filters around the vertical but not necessarily all the vertical filters are around this some they even go near the chroma circuit to correctly identify all the vertical filters check on the plate with which number the vertical circuit is identified for example if it says IC301 then the filters c301 c302 c303 .. c310 are from the vertical look around the chroma if any filter related to the vertical is there and change the resistance of the vertical that are within its tolerance value
22.858
hace 5 años
Maybe what you mean is that the TV does not have a vertical seal and this is passing the image from the bottom up, I did not get any diagram so I do not know how old or so modern the TV is, some old TVs bring the vertical frequency adjustment with adjustable potentiometer, others bring it with electronic adjustment through eprom memory, if you have the diagram upload it or upload the link for download .... greetings.
1.957
hace 5 años
Do not necessarily change it for now but if you have one to test directly do it ... if you do not have take out the selector and solve it carefully wash it check that there are no unions and reinstall and test ... but first check the voltages to the selector that are fixed without variations
hace 5 años
javier good afternoon .. mount another varicap and some channels full and others with the same fault
1.957
hace 5 años
Is there a difference with the previous selector or is everything still the same? That is to say with the previous selector the channels behaved the same or with this other selector it was corrected in some channels .... comment that voltages are reaching the selector and upload an image of the plate from the top ... check if in the board is indicated that voltages must be in the selector if you do not comment on those found on the selector pins with the TV on ...
hace 5 años
With the selector q set you tune some channels well and others with the fault ... with the selector that had all the channels with the fault
30.814
hace 5 años
hace 5 años
Hello Friend. change the filters that are related to the ic. vertical, and check if the swich or pulses are glued more to change the channel. Cheers
hace 5 años
selector voltages:
AGC :: 7.3v
BM: 8.8V
IF: 0V
BT: 32.8V
BP: 5.2V
CLOCK: 0V
DATA: 0V
ENABLE: 0V
1.957
hace 5 años
The voltages to the selector are within the normal value .... apparently it could be having problems in components between the selector and the jungle try changing the capacitors at this stage that tv is old could be giving problem ... the channels look good color does not fail?
hace 5 años
javier: the color is fine, I have had it on for an hour as it warms up and the other channels already work well can dry filters (condensers) as you say.
1.957
hace 5 años
It could be ... although it would be good to give this selector a touch of solder internally, taking care not to damage the printed circuit and leave no joints ...
hace 5 años
Javier: I already retouched the 2 selectors and if they improved but some channels with the fault and when it heats up TV it improves
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