Re: Tecnoware FAL501FS12 does not turn on
I guess that mystery is solved now.
I guess that mystery is solved now.
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Re: Tecnoware FAL501FS12 does not turn on
Hi
I changed the resistances, now the voltage on the large capacitors has stabilized, but the power supply still does not start, I try to change some capacitors and I update youComment
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Re: Tecnoware FAL501FS12 does not turn on
I replaced all the capacitors, even the small ones under the heatsinks, except one under the heatsink of the secondary that I did not have (220uf 50V) but still not showing signs of life, I checked the schotty diodes and they are good no signs of short, I have always and only 5v standby, what do i do?Comment
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Re: Tecnoware FAL501FS12 does not turn on
on pin 12 of the KA7500 I have 16.5 voltsComment
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Re: Tecnoware FAL501FS12 does not turn on
Pin# 12 (vcc) is supplied by the standby transformer, Check the voltage on the driver transformer (arrowed) Also check the voltage on the two transistor bases.
What is the number on the other ic in the secondary?
Use the Secondary Ground to check all voltages on the secondary side (black probe on ground)
This schematic might be close.Attached FilesLast edited by R_J; 04-14-2020, 11:51 AM.Comment
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Re: Tecnoware FAL501FS12 does not turn on
You don't understand the difference between the primary side of the power supply and the secondary?
The primary side is connected to the mains high voltage and could be deadly if you don't know what you are doing.Attached FilesLast edited by R_J; 04-14-2020, 12:10 PM.Comment
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Re: Tecnoware FAL501FS12 does not turn on
absolutely, you did not understand me, I know that well, I want to understand how to manage the tester's test leads on the indications you gave me, as I asked you, should I put the black test lead on the mass and with the red test test the points indicated on the photo? it's a test I've never doneComment
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Re: Tecnoware FAL501FS12 does not turn on
See the pictureAttached FilesComment
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Re: Tecnoware FAL501FS12 does not turn on
Yes this is correct placement of the probes, The schematic in post#45 should be closer to your power supplyLast edited by R_J; 04-14-2020, 01:26 PM.Comment
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Re: Tecnoware FAL501FS12 does not turn on
ok,If it can be useful, the second ics is an lm339ldComment
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Re: Tecnoware FAL501FS12 does not turn on
Then with the power supply in standby the voltages are these
Driver transformer (yellow arrow) 1,50v
B 2.25v
E 1.50v
B 2,25v
With the power supply running
Driver Transformer (Yellow arrow) 1,85v
B 1.50v
E 1.47v
B 1.52vComment
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Re: Tecnoware FAL501FS12 does not turn on
what should i check now?Comment
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Re: Tecnoware FAL501FS12 does not turn on
That voltage for the driver transformer (arrow) is low, look at the schematic (R12 2.7k) and follow the line on your board, it should have 16v on one side of that resistor. Also check the 2 transistors and the diodes connected to that drive transformer.Last edited by R_J; 04-15-2020, 10:26 AM.Comment
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Re: Tecnoware FAL501FS12 does not turn on
Transistors and resistors on the secondary or primary? forgive me but on that scheme I understand very little because it is not structured like my atx, sorry and have patience thanks, if you want I send you a photo without heatsinksComment
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Re: Tecnoware FAL501FS12 does not turn on
A picture without the heatsink would help, The transistors to check are on the secondary (I marked the emitters with a E, and the base with a B and the collectors with a C. The transformer on your board (under the yellow arrow) is T2 on the schematic.
This part of the schematic is closer to your board than you can see.Attached FilesLast edited by R_J; 04-15-2020, 10:48 AM.Comment
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Re: Tecnoware FAL501FS12 does not turn on
Okay, now I'll send you a photo without heatsinksComment
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Re: Tecnoware FAL501FS12 does not turn on
here she is
to the eye it does not seem to me that there are open resistancesAttached FilesComment
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Re: Tecnoware FAL501FS12 does not turn on
I checked the diodes and they are good, the resistances are good too, the transistors are c945, I tried the first one and I have the same value on E and C (i.e. about 618), on the other I noticed a strange thing about C gives me 618 on E 360, what do you say?Last edited by falcontech; 04-15-2020, 12:02 PM.Comment
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Hi guys, I’m back here my friend give me her tv, that doesn’t turn on and no standby red led. When u plug in the cord the red led of one two second is on, then turn off. If you push the power button or the remote the red led blinks but nothing happen. I give u some photo with voltage, don’t look the fuse….because I blow it for mistake nd I dint have the right replace so I just put it for test the tv. The standby voltage should be 11,88 volt on the diode, but I have 13 volts. I put in the photo the different volts I test and there are someone negative…I don’t know if it s normal. On... -
Greetings!
Thank you in advance for your understanding, I am writing to you through a translator.
A Harman Kardon AVR171S amplifier was given.
The history of the machine is as follows:
It was faulty when I bought it, I want to fix it.
I replaced the HDMI switch and one of the DAC ICs in it.
After that it worked without a problem.
I watched a movie using the amplifier, and at the end the amplifier got really hot.
The cooling was faulty, I will fix this later.
I switched it to standby mode, waited for... -
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It was plugged into a surge suppressor and was off (on standby) when I turned off the power,, so I don't know if it got a power surge or was on its way out anyway. I... -
Hello,
I need advice in troubleshooting Telefunken TV (it is actually Vestel). There is red Standby light but TV cannot be turned on either by remote control (which is good and tested on another TV) or by actual on/off switch at the back of the TV.
Power board is Vestel 17IPS71 and I'm not sure about the mainboard, it seems like 17MB82S
Both boards are shown in the attached photos.
What is normally first that is checked in this case. I have removed power board, make sure it has no dangerous voltage on the big caps and check many components (transistors and diodes)...
Comment