Re: Sony Bravia KDL-37M4000 doesn't turn on
I'm going send new inverter back for exchange and go from there. Also, I think I'll keep an eye out for another main board that is reasonably priced. I haven't been able to find an exact match yet though. ShopJimmy is out of them, as are a couple of other places I've checked. I'll button this one up for now and come back to it later.
I picked up a 37" LG the other day that has some kind of problem that causes it to have to warm up for 20-30 minutes before it starts working. Maybe that one will be easier to figure out....
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Re: Sony Bravia KDL-37M4000 doesn't turn on
That figures... I can see about exchanging the new one for another one to see what that happens then.
Still no idea why the new one doesn't trigger the 6X blink error?
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I disconnected pin 1 (Dimmer) to CN4003. With resistor I get 0V on/off. Power LED glows steady green. Without resister I get the 6X blink error and power shuts off after about 5 seconds.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I swapped the old inverter back in. The 6X blink code is back. I get a green power LED for about 5 seconds and the TV shuts off, then the blink code starts. On pin 3 I get .27V off and 1.92V on.
With the 100 Ohm resistor installed I get the green power LED on continuously, no shut down. On pin 3 I get 0V off and on. The TV still doesn't do anything.
I don't know what I was doing last night when I first put that resistor in, but somehow I was managing to bypass it when I was checking the voltage readings... DU...
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I was thinking about doing that to see what happens. I'll swap them out in the morning and let you know the result.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
Now that I think about it, I did notice something odd when I was messing around with it tonight. I had unplugged the connector on the inverter to gain better access to the wires. After I plugged it back in, I was getting the .27V at power off and .93V at power on when I checked pin 3. The 1.36V didn't show up again until I turned power off and on again a couple of times while checking the voltage with and without the resistor. Those were the voltages I was reading when I first installed this new inverter.
It is weird that...Last edited by winterwar; 08-29-2013, 11:02 PM.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
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Re: Sony Bravia KDL-37M4000 doesn't turn on
It still doesn't do anything.
I did notice that the power LED comes on bright then dims and then is bright again while I was powering it on tonight and a few times I had to power it on/off a time or two before it would stay on.Last edited by winterwar; 08-29-2013, 10:27 PM.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
Ok, I got rid of the jumper wires and connected the resistor directly to pin3 and pin 4 (GND) and the 1.36V drops to 0V.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
It's should be 1/2W 100 Ohm. Brown, Black, Brown stripes. 10 x 10^1
Let me try a different setup right quick...
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I just double checked it again. Now I get 1.38V with or without the resistor when powered on.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I verified the voltages and they are the same. LOL
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I connected the 100 Ohm resistor to pin 3 and connected the other end to chassis ground. When I plugged in the TV it read .76V and when I turned on the power it read 1.36V. Then after I turned the off the power and it dropped to .25V. I had to unplug the AC and plug it back in to get the .76V reading again.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I really appreciate your assistance on this, Bud. I'll try that 100 Ohm resister later this afternoon and see what happens.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
Pin 1 (Dimmer) is 0V when off and 1.63V when turned on.
Pin 2 (Backlight) is 0V when off and 3.14V when turned on.
Pin 3 (Inverter_err) is .76V when off and .93V when turned on.Last edited by winterwar; 08-28-2013, 09:22 PM.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
Ok, I replaced the inverter. It's still not working, but now I'm getting slightly different symptoms.
The Timer/PIC LED doesn't flash red at 6X intervals anymore. The TV turns on and stays on with a green power LED. When powered off, there's no standby LED (never was). There is still no backlight, no video and no audio.
I checked the standby power circuit at CN602 on the power board. With the power off, there's 3.36V at pin 3 (Standby), 3.36V at pin 2 (AC_OFF_DET) and 0V at pin 1 (POWER_ON). With power on...
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I have another inverter board coming. Hopefully, that will solve the problem. The inverter that's in there has a couple of dark spots on the back that look suspicious....
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Re: Sony Bravia KDL-37M4000 doesn't turn on
I'm getting 24V on Pin 1 at the inverter connection (CN1). I'm also getting 3.2V for Backlight_ON voltage at Pin 2 on the BM board connector (CN4003), but it drops to zero after about 3-4 seconds. Should that be a continuous 3.2V or is it just a momentary signal to power on the inverter?
I don't get any voltage readings on the HV side of the inverter when I turn on the TV per the instructions on FIG 4-4 that you provided.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
There's no connection on Pin 5. The plug has an empty hole.
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Re: Sony Bravia KDL-37M4000 doesn't turn on
Pin 3 is .76V when off and 1.9V when turned on. After about 5 or 6 seconds the TV shuts itself off and the red LED starts flashing. Then it only reads .27V.
Pin 2 is 0V when off and 3.2V when turned on. After a few seconds and BEFORE the TV shuts itself off, it drops to 0V.Last edited by winterwar; 08-23-2013, 07:37 PM.
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