Re: Jvc jlc32bc3000
no change
no change
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Re: Jvc jlc32bc3000
OK, so I suspect this device is faulty. (See attached.)
Can you get the part # on it? It is probably a PNP transistor but it could be a P-channel MOSFET.Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
Kia
431a
117Comment
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Re: Jvc jlc32bc3000
Oh, it's not either of those. I think I understand it. It's a voltage reference. It's regulating the 18V down to 12V, which is an odd way of doing things -- I'm not sure why they would do it that way. I need to trace out the circuit to understand why it's not working. I will be back.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
OK, here is the voltage regulator part (see attached.) But I can't trace it fully yet as I don't know where R222 connects.
I remember seeing this circuit in a Samsung TV too. I think it is to reduce the standby power, by using a single transformer.
I need you to check which component this lead is part of (see attached.) I have a strong suspicion it is ground.Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
it connects to r285 then to q283.Comment
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Re: Jvc jlc32bc3000
this what I foundAttached FilesComment
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Re: Jvc jlc32bc3000
How difficult is it to make some tests on the power supply's rear side? I am thinking that the control signal is not reaching the TL431 or the TL431 is shorted out. I would need to know the voltage across R223.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
R223 0vComment
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Re: Jvc jlc32bc3000
OK, in which case, I am thinking it is a problem elsewhere on the PSU. (Probably in that large component area near the power connector.) It's not getting a signal from that part.
Is there a part # on it? I'd love to debug it more but it's proving a bit beyond me. If it's only about $20-30, it could be worth it.Last edited by tom66; 11-04-2012, 02:18 PM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
I think this will helpAttached FilesComment
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Re: Jvc jlc32bc3000
Sorry, what?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
I was looking for the part number of the board, but I found it.
http://www.shopjimmy.com/vizio-0500-...t-inverter.htm
Never mind, it is very expensive! There is another thing you can do. If you don't mind the TV using a bit more power in standby, then the 12V can be forced on.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
sounds good to me.Comment
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Re: Jvc jlc32bc3000
OK, see the attachment.
You need to cut the jumper link on the top between the two pads.
Then solder a 100 ohm resistor between the 18 ohm and the bottom most pad on the jumper link (nearest the KIA431.) 100 ohms is flexible. Anything up to a few 470 ohm down to 47 ohm should work. It's just to prevent damage in case of failure (the resistor should be the only casualty in the worst case.)
Very important: BEFORE you connect the main board double check the 12V output is giving 12V and not 18V! It should now be 12V all the time.Attached FilesPlease do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
that did restore the 12v pins but it still wont turn on.Comment
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Re: Jvc jlc32bc3000
OK, that is very odd. I am confused, it should work. Was the TV hit by a surge? Any idea how it failed? Any different symptoms with 12V now?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: Jvc jlc32bc3000
no surge. the TV just slowly stopped coming on reliably. 12v seems okComment
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Re: Jvc jlc32bc3000
Does the TV do anything differently at all? Like, if it had no power LED before, does it have one? Can you turn it off once it is turned on?
You say it stopped turning on reliably -- does this mean it would turn on once in a while, but not always? Did it get slowly worse over time?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Hello all,
I'm stumped on this guy, so wanted to see if anyone has any further ideas:
Intro:
This is an Acer Nitro 5 AN515-55-55M1 with unknown prior history (bought "as-is" on eBay). It charges the battery and powers on from both AC adapter and battery, so I think this rules out main power issues.
Upon attempt to boot, it will "reboot" (meaning powers down and then powers on again) only once, and then stays stuck in a status of lights on / no post / no monitor. Powering on with fn+esc maxes out the fans on first boot attempt,... -
Powers on as normal shows an image then powers off after 10 seconds
I have to unplug it from the wall and replug to get it to turn back on but then shuts off
No blown caps
I searched for this model but nothing comes up...11-29-2024, 11:21 PM -
A few months out of warranty and it's dead as a fart. XPS 8950 with a 12th Gen I5, 32gb DDR5 RAM and a GTX1650 GPU.....
Symptoms it's giving are really making a coin toss between bad motherboard and bad PSU....I'm leaning toward motherboard, but there are some strange irregularities with this piece of shit system.
Basic test:
Upon connecting power cord, system powers on by itself (no button push) for a second then powers down...and then powers back on again, I hear a relay trip inside the PSU, and then powers down again and that's it. It won't do anything else.... -
Hi,
I am new to this forum and have searched for some answers with problems similar to mine.
Philips TV powers on as normal for about a minute or less then click and no power at all not even standby light. If i disconnect from mains and reconnect it will power on again but for a shorter time. Once i leave it disconnected from main for a longer time it will power on for a longer period the next time.
It sounds like a power supply issue?
I have the board out and want to run some tests. Not sure what i should be doing but i put a 1k resistor across SB and +5v... -
I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
- PPBUS_G3H (12.6V-12.8V)
- This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
- PP3V42_G3H (3.42V)
- This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
- PPVRTC_G3H (3.3V)
- This
- PPBUS_G3H (12.6V-12.8V)
Comment