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Tube TVs

General Plus CB2195F vertical failure

JuanD333
JuanD333
111
hace 5 años
hace 5 años
Greetings, this is a 21pg General Plus TV model CB2195F which has vertical failure (LA78040), already check the plate and solve cold welds, to have another LA78040, try changing it and the fault persists, I proceeded to measure voltages in the Vertical IC and I have the following: pin 1 = 1v pin 2 = + 13v pin 3 = + 1v pin 4 = -12v pin 5 = -10v pin 6 = + 13v pin 7 = intermittent 1 and 0 volt in the anode of the diode that goes between pin 3 and 6 there is + 13v, superficially I do not see deteriorated components near the vertical circuit, attentive to any suggestion PD: there is no sweep only from the middle down
manolo karvalo
hace 5 años

friend. according to data that ic. vertical must have on each pin the following trend. pin 1- 0.8volt. pin 2-15volt. pin 3- 9.8volt. pin 4-15 - volt. gnd pin 5- 0.2volt. pin 6- 15.5volt. pin 7-0.8volt. This has to be measured after you change the filters.

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manolo karvalo
hace 5 años
hace 5 años
Hello Friend. before changing the ic. vertical you have to change all new filters that are related to the ic. vert. and change even if the diode that feeds the ic is good. vertical if the fault persists check the resistors that feed the diode whether it feeds on the flayback or the choper. Cheers
JuanD333
JuanD333
111
hace 5 años

I will do that and comment results

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JuanD333
JuanD333
111
hace 5 años

A little late excuse me, change components adjacent to the vertical IC and it worked without problem, apparently it was the diode between the vertical pins, thanks for your help

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