✅ Test tv sources with 60 watt lamp. Panasonic TV CT-F2136

edgarrodriguezgonzalez201

313

hace 5 años

Greetings, colleagues, I am relatively new in the repair of TV. Fortunately, the devices that I have repaired have not presented complicated failures and I have solved them only by changing exploited or deficient components with the naked eye, also following missing voltages, but there is something that I could not understand well and It is the test of the source connecting a false load (60w lamp), for the comments in the forums this test is fundamental to diagnose if the source is working well or the fault is in another stage or if the flybackel is the problem . I would like to master this issue since lately I have been presented with power failures that I have not been able to repair. Recently I have a panasonic TV that the only thing that does just connect it to the network is to open and close the relay intermittently and without rest and does not allow me to measure any voltage. I know that there are several links but if it is not too much trouble I would like you to explain to me how and in which specific cases to apply the test, in which places to take the readings and how to interpret the results, I have also seen that there are different tests with lamps connected in different places Sorry for my ignorance and thank you in advance for your contributions from Venezuela.

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tevetronic 1

107

hace 5 años

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hace 5 años

hello colleague from Argentina to test if the source works to load a 70w lamp the lamp must be incandecent you have to take out the horizontal transient and solder on connector and emitter the lamp comments

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felipe antonio

2.308

hace 5 años

companion. without entering into theoretical aspects, nor mathematics etc. etc. (because the topic of focus is extensive). We will do it in a simple way: 1.- A 100w bulb is connected in series with the plug. this in case the source had a short. 2.- you remove the flybck and the hot and connect a 75 / 100w focus of the bmas to ground, this because the source needs a load, 3.- you connect your frequency meter at the base of the hot and check the oscillation 15750. 4 if you don't have a vpp probe connected to the driver's collector and then to the hot base. So you can check the source and the oscillation without having the flyback or the hot placed. regards. Felipe ascencio

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edgarrodriguezgonzalez201

313

hace 5 años

Ok buddy thanks for answering, let's see, in a practical case, I have this panasonic tv that only activates or deactivates the relay without giving me a chance to measure voltages, the tsh is good, there are no bulging filters, no diodes, no bad resistances, I Would you like to know if the false load test applies to this case? Should I remove the horizontal transistor connect the lamp between emitting collector and when giving the order of ignition, what should I measure?

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felipe antonio

2.308

hace 5 años

As you can see, each technician has his method. I prefer to remove the flyback and the hot one: 1.- If the flybck had a short focus, it would be of little use. 2 there is more space to work and check more components. for this and for any case it applies.- suppose you have already connected the focus on the bmas. you connect the plug, press the switch and the voltmeter has to be connected. Czech in the bmas pin of the flyback. There you have to measure how much you have of voltje. and then we will continue with the oscillation. Felipe ascencio

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nicomena2015

9.501

hace 5 años

hello colleague: filament lamps is a tool that we use, technicians in TRC generally to know how the source is (voltage and power) ... and we also use it as protection by connecting it between the power grid line and the tv .. .this is always at the discretion of the technician ... if there is a presumption of q, there is any overload or short on the board we connect a 200w lamp between the electric network and the tv ... the PTC is disconnected and the tv is turned on ... if we see that q, the lamp turns on at full brightness is a sign q, there may be some short on the board ... if we see that q, the lamp turns on and off is a sign q, there is no short and the flash can be when charging the line capacitor ... and over time according to the brightness we draw some conclusions q, they serve as a review ... when we use a 60w lamp in the (+ b) is xq, we want to know how the source is regardless of the horizontal output stage ... in this case we see if the voltage of + b is inside what the ski says ema ... but not in all tv sources the same thing happens ... in some the voltage of the + b remains stable in both stand-by and power ... in others in stand-by is a lower voltage and when giving power, raise the voltage to its correct value ... anyway knowing how to use the lamps is to work better and with less risk of burning important components ... and with respect to the panasonic remove the trans, salt, hor and see If you keep hitting the relay ... I hope this little comment helps you ... greetings!

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edgarrodriguezgonzalez201

313

hace 5 años

Grateful for the clarification, regarding panasonic if, when disconnecting the tsh, it stops connecting and disconnecting the relay, should I change the horizontal?

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nicomena2015

9.501

hace 5 años

If, when removing the trans, from salt, hor, the circuit does not stick and take off the relay, the trans, is damaged or the fli-bak ... but you must measure the tsh to ensure if it is damaged or not ... It is also possible that the protection detects some overload or short or the source does not regulate well ... several can be the causes of q, the relay hits and then ... x Now do that remove the trans, and see if tension appears in the secondary one ... if it appears then you connect a 60w lamp between the + by mass to see what voltage you have in the + b ... I see if I find a diagram ...

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Test tv sources with 60 watt lamp. Panasonic TV CT-F2136

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