Re: Tecnoware FAL501FS12 does not turn on
thanks my friend to you for your patience, however I opened another thread for another atx more or less the same, I explained them all the tests already done, I'll wait for your valuable advice
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Re: Tecnoware FAL501FS12 does not turn on
Very good find! We would not be able to find it, like you did. It's always harder to repair something that someone else had worked on before. You are getting good at it and soon be helping rather asking for help!
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Re: Tecnoware FAL501FS12 does not turn on
Hi Caps I solved, it was those two resistances that I highlighted on the photo, looking at the working power supply I noticed that they were different, someone before me had replaced them by mistaking the value ... all ok thanks now I have to repair another one, there we hear on another thread THANK YOUAttached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Tecnoware FAL501FS12 does not turn on
those 18V on pin 12... is with the PSU on. What do you get with the PSU off?Leave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
In a while I try to invert the two heatsinks with all the components even if they don't give me any short problem. I also eliminate this doubt.Leave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
I did the tests you asked me, I have no output voltage except for the 5v standby, nothing on -12 +12 -5 +5 +3.3, on pin 12 I always have about 16.50, I have a equal power supply working and I saw that on pin 12 we have more than 18 voltsLast edited by falcontech; 04-17-2020, 05:33 AM.Leave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
ok tomorrow i will try what you asked me now i am not in front of the psuLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
check again Vcc on pin 12 on the KA7500, and then measure each voltage rail, while turning the PSU on and off again on each rail. I am looking to see if the PSU actually tries to come on but is getting held back or something is open. I am looking for minimal voltages on any of the output rails -12V, +12V, -5V, +5V and 3.3V.Leave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
please if you can tell me what these resistances are on my photo, I have a little trouble understanding that scheme thanksLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
I looked at the circuit, q3 and q4 are the transistors that I have already replaced so they are new I saw that nearby there are capacitors that I have already replaced and diodes but they are all good, the visible resistances are goodLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
ok thanks tomorrow i tryLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
basically pin 8 and 13 are driving Q3 and Q4. Then it goes through tranformer t2 and drive the big transistors Q1 and Q2. It continues through transformer T1 and then all gets rectified on the secondary (low voltage side).Leave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
check Q3 and Q4 plus the components in that areaLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
i tried to change also lm339 nothing moves, tell me what i can try now it has truly become a mysteryLeave a comment:
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Re: Tecnoware FAL501FS12 does not turn on
no, I don't see anything but nothing, there is no shadow of tension, I tried to replace the ka7500 with a tl494 taken from a working power supply but nothing does not start, could it be lm339?Leave a 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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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)... -
My Samsung LN32B540 never turned back on after I had to turn off the power at the mains at house. It won't turn on, but the red standby led lights up when it is plugged in. If I hold down the power on the remote, the standby light turns off which I think means it is trying to turn on, but there's no sound or backlight. If I try to turn it on/off from the power button on the TV instead, it doesn't do anything at all.
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...
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