TV cyberlux model Tvr2cx-21us chassis ph08kx-n35 without voltage en +
friend. check the filters and diodes that are after the choper may be undervalued and check the opto coupler and resistors of that stage
I'm going to look for an exact one and the r554 of 150k measures 154.4k and right now I'm going for the diodes and the filters
Well my friend still does not turn on change filter + b c567 c568 change the optocop, rebice secondary diodes are fine replace the r514 and r554 and nothing that turns on the eprom that has is fm24c08a and I don't have an equal I have one of a cyberlux 29 "and it is cw24c08c help x please
friend. If the TV micro. of 29 is the same as the same number, you can try only to turn on the TV and first measure pin 8 of the eprom aber if it has 5volt. in estambay
No friend are not equal 21 is tda11115ps / n3 / 3mc2
And the 29 is tda9377ps / n3 / n1953 and I don't know what else to change
If friend pin 8 of the eprom I have no voltage or on the microphone, the LED lamp does not turn on help x please colleague
friend. If you don't have volt. in that pin you won't turn on the tv. you have to check the line that feeds the mic and check the line of pin 8 of the eprom open because those 5 volts do not go. to pin 8
friend as I said before I did not have voltj in the + b in the secondary of the chopper in stam are in vd562 = 13.7v Vd563 21.6v Vd565 = 0.4v Vd566 = 21.9v vd559 = 0v vd564 = 0v the voltages are raised less in the + b 0v and that is why I think the eprom does not feed me and the micro LED does not turn on the TV does not come into print and does not turn on the LED
correct friend change the regulator x a new one and nothing the opto was also changed, now that tl431 where it is located and the diodes have been measured but without removing it from the board and they measure well and the small filters if not replaced by colleague
friend. Well, it doesn't bring that tl431 but if you have the diagram it is easier for you to get the fault I thought you didn't have the diagram
If I had the diagram but I still do not give the fault x that I am looking for access with the colleagues of the post to help me since I am not very expert and I am starting on this topic, and I have already changed several pieces and nothing with the fault t I have to remove the suiche, download the primary filter and return the suiche to on and at the same time I have the tester on the ground and + b to see if I get any voltages and if it arrives but high 144v and at the same time 0v goes and the diagram tells me that there are 110v, leaving the + b in 0v and so that voltj appears again to repeat the same
friend. If you have left with volt. the large source filter is a signal that the voltage regulator is bad because it does not discharge or it may be some resistance that is bad or some preset is oxidized from the source
ok but I already changed the regulator x a new one but I think the problem is in the primary source xq the large filter voltage is 170v but the diagram does not indicate that filter voltage, I will check the resistors and the preset is the adjustable regulator with the screwdriver
No, these Chinese TVs do not use a TL431 error comparator. These use a simple NPN transistor of nomenclature C1815 linked to the optocouple of the secondary side of the source, change it so measure well and measure the resistances that are around it. Without exception.
correct colleague carries a transistor c1815 tomorrow I change it and I indicate even if I already change the r554 and r552
Ok but don't skip the VD560. nor the R555. another thing is what you say what you measured secondary voltage in some diodes Are these voltages stable (even if they are bad)? measure voltage again in parallel to C567 (by desoldering + b pin on the flyback, do not solder it until the source is repaired) It also measures ...
Colleagues continued with the failure and I did everything they said and rhonnyua the + b always had luck and the c507 keeps the volt not low 170v and replace all the filters of the secund chop the v553 vd560 vd581 r552 r553 r554 r556 r557 r522 r523 r511 r513 r512 r519 r524 r502 vd519 all resists mark well off the board i don't know what else to check help x please don't want to give me defeated
If my friend answered, he relives everything he said and nothing the vd560 and r55 is fine if I measure voltj in the diodes all are but elevated where there is no + by which food is the + b you are disconnected and I measure with the land of flay and tuned vd565 well all the choper filters were changed the diodes are fine the vd 581 is fine the c1815 was changed and nothing.
It measures voltages between pin 1 and 2 of the optoacople but not with respect to ground. Bone black tip in the cathode of the opto internal diode and red tip in the anode of the same internal diode. Those are the 1 and 2 legs that I mean. said internal diode is drawn in diagram. give me this voltage and what have I asked you
friend, the filter voltage is c562 24v, c563 24v, c558 4.8v, c564 0v, c161 16v, c507 171v, the c507 keeps its volatje always c567 and c568 when connecting it reaches 145v equal to + by with it fading to zero and I had to unplug and wait for a while for that voltage to come back, the optocouple on pin 1y2 0v and pin 3y4 11v excuse me for the delay my intern is pity
I already replaced everything that asked me for resistance filters the c1815 the zener diodes measure well equal to the diodes of the primary and secondary are well everything was measured by disconnecting it from the card
Yes brother of Venezuela, that is the problem and I do not give with the fault I will have to change the regulator again to see what happens xq already changed and tested and nothing in the choper I have no voltage on those diodes that already indicate the vd564 vd565 vd559 in the others yes but high voltaj, and it is as you say this runaway
no friend of injecting voltage with external source no and the source i have of 12v dc is pc..sirvera. and how would he use it to put earth from the source to the cold ground of TV and the positv to that of c564 or not.
Of course, my friend will be happy with you. hehe but not all failures are easy or equal.
the strange thing is that sometimes I connect it to the network and turn on the LED and all voltages are high the c507 175V + B 150v but eye is disconnected from the flay, and if I disconnect it from the network it becomes equal to the commence without voltage in + B and does not turn on the led
Good evening colleagues is to add that the failure of this TV has already been SOLVED thanks to rhonnyuam I was able to solve, well the problem was the choper transformer that for the VD565 pin I did not get +14 voltage for the others if, the diode was changed, it I raise the same and nad 0v, rnonnyuam suggests that I inject + 12v with an external source that did it and effectively all voltaj were restored, now that line of the same TV had to be fed, the voltage of pin VD563 + was taken 16v making a bridge and proceed to light and ready all voltaj were restored, thanks to all x aprt
