Hi I got Sony kdl-46w905a and it won't turn on and no red blinking code and all I hear when I plug it in is a clicking noise and a pause for a second then another clicking noise as if the power supply has a relay and is relay is turning off the power supply bcuz of a problem, bcuz of this I have no way to check voltages anywhere as there's no standby light but I think I get a white light for a second then goes off, I've checked for bad capacitors or shorted mosfets but haven't found a problem, and I was thinking if there's a way To bypass the protection so it stays on so I can check voltages ? Or maybe someone can help me on what to try ?
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Unplug from power, unhook cable from powerboard to mainboard, plug power back into powerboard, do backlights come on and is the clicking the same? -
Re: Sony kdl-46w905a won't turn on and relay clicking noise
Ok, with everything hooked up do test #3 below, demonstration in #2 if needed, try to do just as instructed, this test is done on the cold side, as always BE VERY CAREFUL when working with the HOT/DEADLY side of powerboard.Last edited by nomoresonys; 10-20-2019, 12:05 PM.Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
I noticed the relay doesn't click when I disconnect the cable from the power supply going to main board, and when it's connected there's no voltages at all on any pins of the power supply, but when I disconnect cable going to main board then the only voltage I get is stand by voltage 3.3v, but no other voltages are present, and as soon as I connect the cable going to main board with power connected the relay on power supply clicks and stand by voltage is gone, the capacitors on main board i checked voltage, and only getting voltage on the big 400v caps and voltage is around 310v, and it doesn't make a difference if the cable going to main board is connected it disconnected , still only voltage on big caps the test I get no voltage ?Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Can you post a good clear picture of the powerboard and the pin labels of the connector if any?Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Could try jump starting power board and see if you get the missing voltages, with cable from powerboard to mainboard UNHOOKED, make sure it is, then connect low wattage resistor from POWER..ON to STBY 3.3 and another resistor from STBY 3.3 to BL_ON, power up powerboard, see if you get the missing voltages and if the backlights come on and stay on.Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
I've never tried that but do you know any videos about doing that and I still don't understand if it's main board or power supply but main board is not available anywhere at the moment but I can get power supply but prefer repairing itComment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Powerboard the one with the big caps and transformers on it.Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Check all your diodes if any read strange take out of circuit and recheck.Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
That test in post #8, if passes usually verifies powerboard and backlights, leaving either a mainboard, tcon, panel issue or connection.Last edited by nomoresonys; 10-21-2019, 08:49 AM.Comment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
Demo there, HEED THE WARNING OF DEADLY VOLTAGES ON HOT SIDE, he used an alligator clip to short pins together, it's recommended to use a resistor so you don't mess up any components in case you accidentally short the wrong pins: https://www.youtube.com/watch?v=mUvclBfaMXgComment
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Re: Sony kdl-46w905a won't turn on and relay clicking noise
I think usually 1k or less.Comment
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I gotten a Carver CM-1090 amplifier from a friend who has kept it in storage for decades. Opened it up, thick layer of dust cumulated everywhere. Vacuumed it semi-cleaned, and blown off as much as possible the remaining dust. This is a 220V version.
On initial powered up with nothing connected - it works with all the lights and button indicator lit up as pressed, etc. I then powered off, connected a CD player into the CD RCA input and powered it on. It seemed to work for a short while and when I turned the volume up and down to see the the VUs works, the power started to clicked off... -
No power
i have the above ps which i change the TOP258eg ic.
Now i have power but is clicking and voltages are flutuating. I change all capacitors, i test all mosfets and all are ok.
i am wondering what is the value of R901! I am getting 0.5Ohms. Is that correct!
the colours look like R,R,W or silver,G Bl.
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Hi everyone,
I'm troubleshooting a power supply issue with a Sony SLV-E780 VCR. The device clicks repeatedly but doesn't power up completely. I've already replaced five capacitors, but the problem persists.
Here's a video link https://photos.app.goo.gl/3Xki6yvCLn67gLX78 showcasing the sound. Based on your experience, could this be due to a transformer, diode, or another component? Any guidance on what to test or replace next would be greatly appreciated.
Thanks in advance for your help! -
Hi everyone,
I require some help with my TV. The TV standby light blicks on and off with a clicking sound (relay?) from the back. After I opened up the TV, I set about troubleshooting by unplugging the boards to try and isolate the problem. My troubleshooting suggests that the logic board is causing the issue, but it could entirely be the YSUS board which is only activated once the logic board is connected.
I have recorded a video which I thought would be an easier way to explain the problem and show the boards at the same time.
I would like to try and identify... -
Hi all,
I am working on a sound processor, it tends to overheat so I fitted a fan inside. The fan is connected to the +15V of the PSU via a DC-DC converter based on the LM2596 to reduce the voltage to around 10.5V.
Unfortunately the analogue circuitry is picking up the noise from the fan in two ways:
1. The fan is close to the analogue section, the motor itself gets into the outputs so I'll have to move it somewhere else
2. Even with the fan running outside of the case, there is still some noise which is clearly going back to the processor via power line....
Comment