Screenshot_2018-01-25-14-12-36.png [42.98kb] Hello friends colleagues greetings.
Today I bring you this problem with this Samsung TV model CT20F3 shasis AA41-00625C which does not give me image there is only sound and there is osd but black the screen ..
tests done: when I go up scren you can barely see the image with delay stripes when I go up scren .. I measured the voltage of the 185v that says on the board I measure it with tuner ground and on the D812 diode it gives me 78v change the diode and it does not go up ... I have another shasis from another Samsung are not the same but they are similar and in the same diode D812 that goes from 185v measures 99v ... I don't know if it will have anything to do ... I haven't done anything else help me friends and change screen and eeprom bone discarded ... eh read about the abl circuit but not sure how to measure that stage ... help friends ...
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Screenshot_2018-01-25-14-12-36.png [42.98kb] Hello friends colleagues greetings.
Today I bring you this problem with this Samsung TV model CT20F3 shasis AA41-00625C which does not give me image there is only sound and there is osd but black the screen ..
tests done: when I go up scren you can barely see the image with delay stripes when I go up scren .. I measured the voltage of the 185v that says on the board I measure it with tuner ground and on the D812 diode it gives me 78v change the diode and it does not go up ... I have another shasis from another Samsung are not the same but they are similar and in the same diode D812 that goes from 185v measures 99v ... I don't know if it will have anything to do ... I haven't done anything else help me friends and change screen and eeprom bone discarded ... eh read about the abl circuit but not sure how to measure that stage ... help friends ...
Samsung CT20F3 TV without picture
hace 5 años
hace 5 años
Screenshot_2018-01-25-14-12-36.png [42.98kb] Hello friends colleagues greetings.
Today I bring you this problem with this Samsung TV model CT20F3 shasis AA41-00625C which does not give me image there is only sound and there is osd but black the screen ..
tests done: when I go up scren you can barely see the image with delay stripes when I go up scren .. I measured the voltage of the 185v that says on the board I measure it with tuner ground and on the D812 diode it gives me 78v change the diode and it does not go up ... I have another shasis from another Samsung are not the same but they are similar and in the same diode D812 that goes from 185v measures 99v ... I don't know if it will have anything to do ... I haven't done anything else help me friends and change screen and eeprom bone discarded ... eh read about the abl circuit but not sure how to measure that stage ... help friends ...
hace 5 años
friend your fault is very simple there is a resistor that connects the GND with the flay ba .. change it r408 I don't remember well
hace 5 años
The R801 of how much is in the diagram comes out that is 300 AG I do not understand .. and I send attached image
hace 5 años
Some other colleague who can help me with the problem please ... I do not know what happens with Yoreparo and they do not help as before that in a TV problem they gave opinions of 3 to 4 colleagues ... no longer ... remember that there are technical colleagues like me who are not yet experts in these repairs. .. help colleagues ....
hace 5 años
Friend I have 2 screens although one is flat and in another conventional but I tried the same with both and it gives me the same fault since both are samsung they are almost similar ... when trying with 2 screens I already tried the same with both yokes ...
hace 5 años
Ok friend, he doesn't put on the blue screen when he's out of signal ... and he gives the menu when he orders it ... and he puts on the black screen when he has a signal and has audio
hace 5 años
No friend, this TV never works with a blue screen, it works with only rain ... and there is not only a black screen and the osd is clear when I change the channel, I upload volume, etc. I only manage to see the image just as it is when I upload the screen a little striped late ...
hace 5 años
What happened colleague Victor why you deleted your comment ... help the more colleagues better
hace 5 años
On the screen of the black tip socket gnd of the same socket and red tip says SC gives me 87v
hace 5 años
press with the mute control turn 182 and power .. when the audio is heard press mute again. and really come out on screen screen
hace 5 años
In between SCREEN ADJUST tells me: NG what happens with that friend so you sent me there ...
hace 5 años
When I move the screen knob to a perfect point it turns green and says instead of NG says OK
hace 5 años
friend, you will turn on the TV again press menu 182 power and this time press volume - (less) .... when you listen to the audio you will press channel- (less) 14 kisses when you are on the IK circuit press volume + (more ) 2 kisses YOU WILL LEAVE THE ACB 1 PARAMETER ..
I just left it on one and turned off the TV to save the changes then turn it on normally, he says
hace 5 años
Friend Abraham did what you said about placing the AKB in 1 and then turn it off and on ... ps the image looks but still very little with delay lines ... what else do you suggest colleague
hace 5 años
Friend Abraham I have seen videos about these failures and the view that in the jungle pin or micro jungle pin 49 abl should be 3.3 v and I do not care 1.8v .. just as the q201 I do not care 1.8v that will be wrong will be the jungle or some other component of you will be online
hace 5 años
Thank you, friend Abraham, since you were always right to change the r near the fly, but I didn't know that the R424, even if I measured well, will give me that fault ... regards
hace 5 años
Friend if it were such a simple fault when looking for the search for yoreparo similar failures were all solved .... second point I do not think colleagues are so bad to not help me because they have always done it friend ... Third, I have done everything that Abraham's friend says about changing resistances near the flyback and the rest that has helped me ... if it is such an easy fault, why don't you post and help me, my friend ... audio but it does not give image when I upload a bit of a delay screen it looks but very very appendages ...
2.308
hace 5 años
hace 5 años
Suggestions.- The problem is the 86 vcd missing (185-99 = 86 vcd) .- options 1.- the partner does not comment how much he has of b +? .- .- will have to do the focus test and comment on the voltage and the watts of the bulb I use. - We need to test the flyback in the circuit (despite having changed the flyback, the yoke etc) but there are other components and for this we need an external oscillator (not to depend on the oscillation of the jungle) .- .- check the vpp in the hot collector with a vpp probe. a variable source of 12 / 50vcd maximum. This way, by decreasing and increasing the vcd in the input pin, you can check the vpp in the hot collector, in the heater and in the 185vcd pin.
2.308
hace 5 años
second option.- assemble a simple source (bridge of diodes and filters) knowing that the vca multiplied by 1.41 the result is vcd. (without going into mathematical details) example 110 by 1.41 equal 155vcd. in this case we would have 65 volts more than the 90vcd it has now. In this second option you have to have an isolation transformer. also assemble a dimer to have control over the voltage that we will increase. For the first option I have the diagrams for the oscillator and the vpp probe. If possible, take a tour of the electronic community there is the probe.
2.308
hace 5 años
only that we use diode 1n4007 because the maximum voltage we use is 50vcd. companion.-inform yourself, analyze it and comment.- options you will always have. Just one last comment: any minimum doubt should be cleared before starting. (if we start). because when it comes to measuring vcd or vpp we have to be fully sure that it is what we are looking for and that we can find. Best regards to all. Felipe ascencio
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