hey tevz good day ..u are my teacher could you please explain how do i find the B+ voltage in these crt tv?? where do i probe an image would be nice if u could highlight it in a picture ...thank u
Hello.the great tevz TV, I have 29 inch LG CRT TV(CN-29H3) which won't display any screen But It surely lit its led lamp ,whenever I plugin ac cable. It is written "MC-7CA(MAIN) 6870VM0056C(6) 980424 L.W.G(0)" and "MC-7CA(CPT) 6870VS0167A(1) 971014 K.J.B(0)" on the surface of its PCB. I plug in this 29inch CRT TV,and switched on ,then I measured pin#9 of STR-S6707 by placing red probe of analog meter to pin#9 and placing black probe to negative termainal of C808 the biggest capacitor(400v 470uf) and It was measured 6.4-6.6Vdc. But In the datasheet of STR-S6707,It says that its On-State Voltage is 7.6Vdc.So I think that there would be a defective component which is undoubtedly adjacent to pin#9 of STR-S6707. And In the same way,I measured cathode of ZD808 zener diode and Q800(C3852A)base,It was measured 7.1Vdc. I also measured positive terminal of C805 and cathode of D807 and Q800(C3852A)collector,It was measured 10.8Vdc. i found The big capacitor(160v 100uf) on the cold side,I think that it is the B+ filter capacitor,So I measured it and It was measured 39-40Vdc. I desoldered all of electrolytic capacitor which is nearby STR-S6707 and measured its capacitance and ESR value But It seems that all of electrolytic capacitor seem to be Okay.and I also measured most of carbon resistor and diode which is nearby STR-S6707,But It seems that all of resistor and diode seems to be Okay.. Is there no way to find any clue for repairing this CRT TV?
bossing hingi sana ako ng tulong. may devant led tv po ako. stambay lng po sya. pag on ko sya mag palit ilaw nmn sya na kulay blue tapus bigla nmn balik sa red. kng baga nka auto shot off sya. ano po ba kadalasan sira nito. salamat po ng marami.
2:00 quiero hacerle una observación: He notado que casi nunca limpia usted los equipos que está usted reparando, la verdad me apena decirlo pero eso no es muy agradable para trabajar así pues a veces se encuentra un daño oculto en las pistas sucias y/o cables llenos de telas de arañas, espero no se ofenda y me gustaría saber porqué razón no limpia si es por falta de tiempo o porque cobra muy poco dinero por el trabajo, o porque no valen la pena los aparatos que está reparando?, me gustaría saber la razón, saludos desde México.