Tv Samsung chassis ks9c does not turn on b + 117 voltage
Televisor RCA TV
Televisor RCA TV
Good afternoon, do you have the chassis service manual at hand that you mention? ... When you test the source to see if it works correctly, you must first enter the TSH or horizontal output transistor ... You must enter 12 Volts to legs 1 and 2 of the multiregulator, but they must go out or get on pins 8 and 9 8 Volts and 3. 3 Volts respectively ... It seems that it has HIPO at the source ... Try this, renew the electrolytic capacitors of the primary of the source.
Thanks greetings Javier Chávez In standby there are 80 volts and 117 in power on in the ic 802 I have 7.8y 3.1 volts in pin 8 and 9 of the ic 802; also the main filter has 130 volts and in the 801 ic there are 10.8 in pin 3 and 130 in pin 1 something very curious is that when you unlink the line of b + and place a spotlight on this line and ground the spotlight on intermittently to what this is due could you help me that I'm starting in this profession I hope you can help me in this repair thank you and God bless you always
Check the good condition of the + B capacitors. and small Zener and electrolytic diodes in the primary stage of the source, including the optocoupler
Regards Javier how can I check the opt with the tester if it is not too much trouble can you explain how
hello: I think the source is fine, the problem is on the secondary side, check cold welds in the horizontal and vertical stage, if you do not have the 180v that go to the CRT that affects the flayback is not working and therefore the horizontal either , check the zone of the horizontal driver the transistor, the traffic, diodes, and the same TSH, if all is well check the vertical zone, slide the vertical ic and try to turn on I would have to show you a horizontal line on the screen greetings ...
Greetings change the tsh and the c404 vertical and the tv turned on perfectly thanks for your help in this repair god bless you
The TV does not only turn on standby LED and when the power order is given the LED goes out as if it starts but nothing starts the TV
that means it goes out as if it starts ... feel the crack of high tension in the tube when giving power ... comment q. voltage has the positive of the C812 at the source in stand-by .. and without taking the voltmeter gives power and see if the voltage of the + b if it drops - it disappears or continues at the same voltage ... according to the chassis q, it mentions this works with 125v of + b in the positive of the C812 of 100mfx160v ... measure in the primary the C801 q, voltage has in stand-by and if you take out the tips of the power voltmeter and see if the voltage drops below 110v ...
In c812 in standby it has 80 volts and when giving power it rises to 117 volts and in c 801 it has 130 volts in standby and in power on the voltage drops to 123 hp volt thanks for answering my questions God bless you greatly
In c812 there are 80 volts in standby and on there are 117 vol and the TV fails to reach the high voltage something very curious the 185 volts that come out of the flay are not present to what is due and thank you for your help god bless you
Greetings Luis a question this tension of c 801 goes directly to pin 1 of the q801 regulator or I am wrong could you clarify this pliss
Hi. It is not going straight. This voltage goes to the transformer and leaves it to pin 1 of the regulator. ante passes through an L802 coil. I upload part of the source in my first contribution.
Ok Luis thank you for taking your precious time to clear my doubts but I measure that voltage in L802 and measure the same does not vary at all because I have that 130 volt in c801
If it will never vary.
I already told you what to do above.
That is the first thing I would do. If the tester is ok.
Good morning friend Luis and unlink pin one of the regulator and only 140 volts appear in the main filter to what this is due
Measure the voltage on the main filter on another TV. So you compare reading of the tester and rule out that it marks badly. Either by defective or low battery.
Or change the electrolytic as directed. I have 220v AC. And in main filter it measures more than 300v. If you have 110v or 120v you must measure 150v or more.