firstline dth-20j1fs in stanb by
Televisor FIRSTLINE DTH-20J1
Televisor FIRSTLINE DTH-20J1
FIRSTLINE_DTH-20J1_chassis_CM-531.pdf [2.30MB]
I tell you in the diode D813 I HAVE A READING OF 18.02VY IN THE RESISTANCE OF BOTH SIDES R805 270V AND 187V
WELL THE MEASUREMENTS GAVE ME THIS D813, 17.94VY R805 10.92V ARE THEY GOOD? I BELIEVE THAT THERE IS A VOLTAGE PROBLEM
Well, that indicates that the Micro is polarized, that is to say that in its Pin 14 there are 5 volts. Now notice if on Pin 32 of the same 5 volts appear when you turn it on.
For the TV to work, 7.5 volts must reach Pin 32 of the Jungle (LA7685N). The voltage of the Power (Pin 32 of the Micro) triggers the transistor Q704 and this in turn to the Q505 so that it lets pass the 7.5 V that come through the R 405 = 560 ohms 2W, towards the Jungle.
Well I tell you in leg pin 14 I have the 5v now when I give power what happens the lega 5 to pin 32 but they go fast is like desir turns on and goes in a second and so on, the other micro la7685n only arrives at the voltage when I press power if nothing
It is as if acting protection. Measure if the 33 volts reach the Tuner through R128 of 15K 2 W. Also the voltage in the Q402 Collector (Driver H.) and if the TSH Collector is 100V. If so, unhook pin 2 of the fly back where the + B or Diode D 821 Cathode that goes to that Pin enters, and in that Cathode you connect a 60W or 75W lamp with the other end to ground. If now the source starts and the + B is the correct one measured in the lamp; and also the 5V are maintained in pin 32, so the problem may be the Fly Back or some element associated with it.
Some parts that usually cause failures are: Q402 = C2482 (Transistor Driver H.); Q804 = A1013; R829 = 7.5K (Goes to the Base of Q804.)
Well, to all this, I tell you, I measured everything and everything is fine, I didn't answer why I was a little busy but the TV was mistakenly left out and got wet with the rain