Re: APS-254 power supply on a 40" sony
Update: got the new / used power supply board in off of eBay and it's working normally. As best I can tell it was in the IC chip on the bottom side of the board that had the failed AC voltage detection. That little chip was going to be tough for me to de-solder / re-solder to just got a board off ebay and it works again.
Thank you for all the help. Great forum. Eagle - if the set is completely dead, my guess would be the power supply. But mine was a different model.
rammar99
Member
Last Activity: 08-06-2015, 08:39 PM
Joined: 07-16-2015
Location: NASHVILLE, TN
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Re: APS-254 power supply on a 40" sony
Pretty much convinced myself that's the issue and have bought a replacement. Should be here next week and I'll post if it was successful. Just wanted to say thanks for all the help yesterday!Leave a comment:
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Re: APS-254 power supply on a 40" sony
Just found this thread while searching for AC OFF DET: [url]http://www.tv-forums.com/forum/TV_Equipment_C4/TV_Repair_Forum_F3/Sony_Bravia_46EX400_wont_turn_on_at_all_P154821/[/url]
Per that, looks like I should have 3v on that pin. Assuming that's still DC. If so, that's quite a bit different than 0.16v and looks to be the issue.
Will check out your thread suggestions too.Re: APS-254 power supply on a 40" so...P154821/[/url]Leave a comment:
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Re: APS-254 power supply on a 40" sony
No LED's active at all, nothing has lit up or flashed since the storm. That's why i was thinking it was a fuse. But seeing the 3.3v and continuity on the fuses seems to prove otherwise.
Just pulled the cables one at a time and no change. nothing on pin3 and ground. Not sure if it's helpful, but I am getting 0.16v on pin 2 which is labelled "AC OFF DET". Looks like that runs through a diode and back from pin 23 on IC6301. That IC is in the "common" repair kit, but not sure i can test it with a simple...Leave a comment:
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Re: APS-254 power supply on a 40" sony
Both of those locations have good conductivity across them. I didn't see any other similar yellow components but I did look at FB6101 and FB6102, down by the incoming power that looked like they might be fuses. Unfortunately both had conductivity across them as well, so still no smoking gun.Leave a comment:
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Re: APS-254 power supply on a 40" sony
budm - that is correct. I just re-verified and i get 3.3v on pin 1 but 0v on pin3 even when pressing or holding the power switch. I was reading back through the sticky on basic troubleshooting and it was talking about 5v as a common "standby" power. I don't see any 5v power on the diagram or on the board. The set is completely dead, no standby light on the front panel - so I was actually surprised to find the 3.3v working. Does Sony use the 12v power for "standby" or should I be looking for 5v somewhere as well?...Leave a comment:
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Re: APS-254 power supply on a 40" sony
Does that confirm it's the APS-254 board (power supply) and I should try to have it repaired or find one on ebay? I haven't found a failed component yet probing around - but then I'm a chemical not electrical engineer.
ThanksLeave a comment:
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Re: APS-254 power supply on a 40" sony
Just to clarify, I did test CN6401, Pin 3 (Pwr On) and didn't get even a momentary change. Also tested between 12v (Pin 8,9) and ground (Pin 6,7) with nothing there either when the pwr button was pushed.Leave a comment:
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Re: APS-254 power supply on a 40" sony
Sorry for the delayed response, I got called out of town this past week. Just got to perform the "Power ON" test with the board back in the TV and there was no change in voltage. 3.3v side stayed at 3.3v when hitting the power button and the 12v side remained dead at 0v.
Thoughts or next suggestions on what to test next?
Thanks in advance.Leave a comment:
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Re: APS-254 power supply on a 40" sony
Budm - thank you for the response. I took the board out of the TV and have it on the counter to test more easily. Sounds like I need to put it back in tonight and try and turn it on again?
Before taking the board out, the system would not turn on with the remote or main power button.
What's the best way to tell if it is generating command signals?Leave a comment:
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Re: APS-254 power supply on a 40" sony
I'm getting 3.3 volts on the secondary side, but no 12 or 24v at the connector pins if that helps.
Thank you,
RamLeave a comment:
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Re: APS-254 power supply on a 40" sony
After a recent thunderstorm, we're having a "dead" set issue that sounds like this thread. What was your final solution?
It is an APS-254 G2HE board out of a Sony KDL-40EX400 (2010) tv. Searching for that board, I first found the ShopJimmy kit that lists component locations and replacement parts for "common" issues with this board. I haven't been able to identify a bad component yet. The fuse is good, the resistors look close to the range printed, the diodes seem to be ok. Unable to test the small...Leave a comment:
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Hello, thanks for running the site!Leave a comment:
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