3rd tv from lot i plugged it in and a loud pop came from it then a smell i took off back cover and a cap top fell down i found the rest on the main board. what would make a cap explode like this on power up?
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Last edited by whatusername; 05-10-2014, 07:55 PM. -
Re: Sanyo dp42840 cap exploded
shorted rectifier or diode is a good place to start looking.
it can just happen - but it's very rare.
nice foto - cap was so crap that it blew it's bung instead of the top vent!
i'd check if it's in parallel with the one next to it.
and if the sleeve is intact - read the voltage & compare it to what's coming out of the board.Last edited by stj; 05-10-2014, 08:11 PM. -
Re: Sanyo dp42840 cap exploded
now are we talking on the power supply board? because even with blown cap i still had the green power lightComment
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Re: Sanyo dp42840 cap exploded
Did you inspect to see if some one else worked on before? May be wrong parts are in stalled or parts are installed wrong, connectors plugged into the wrong places, fuses are jumped with wires, etc.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sanyo dp42840 cap exploded
well the issue is 1 cap is completely gone exploded that's all the paper stuff u see so i cannot identify it but the 1 that blew was smal. there are a bunch of other small ones on the board but different uf's and voltages so im in the dark here without a diagramLast edited by whatusername; 05-10-2014, 09:01 PM.Comment
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Re: Sanyo dp42840 cap exploded
now wait.
are you saying that when you opened the tv,
the can from that pile of paper wasnt in the tv?
because if you are then someone was obviously in there before you.
and i'v said this in another post, but a good visual inspection before you connect the power is always a good idea.Comment
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Re: Sanyo dp42840 cap exploded
no it was in there and blew up as soon as i powered it up and yes i inspected the board and it is a fact someone replaced that particular cap and either A put it in backwards or B used the wrong size cap. my only question is y didnt it blow till i plugged it in? is should have blown when he did it unless he didnt power it up afterwards? i need a schematic of that main board so i can get the cap value and get a replacement anyone have 1? chassis is a DP42840-03Last edited by whatusername; 05-10-2014, 10:35 PM.Comment
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Re: Sanyo dp42840 cap exploded
Maybe he used a too low voltage rated capacitor that handled it for a little while then blew up.
I made a circuit board with some SMD tantalum capacitors, put one backwards. Caps were rated at 16v and supply was 5v, it lasted surprisingly quite a while before it went up in smoke."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: Sanyo dp42840 cap exploded
I guess that could. B possible. I dunno. Im hoping. Someone has this schematic or maybe same tv and can tell me what cap i needComment
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Re: Sanyo dp42840 cap exploded
Found one from
It has schematic"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: Sanyo dp42840 cap exploded
yea i have seen that one and have looked at it for hours but cannot find the cap because the board in the schamatic does not resemble the actual boardAttached FilesLast edited by whatusername; 05-11-2014, 07:48 AM.Comment
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Re: Sanyo dp42840 cap exploded
It's a N7AE board so this manual should be correct. You know it's an electrolytic not a ceramic so one of these is most likely.
C1660 CEXLB1C101VDN ELECT 100U M 16V
C1662 CEXLB1C102VDN ELECT 1000U M 16V
C1664 CEXLB1C101VDN ELECT 100U M 16V
C1666 CEXLB0J102VDN ELECT 1000U M 6.3V
C1672 CEXLB1V471VDN ELECT 470U M 35VComment
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Re: Sanyo dp42840 cap exploded
I think it's
C1660 CEXLB1C101VDN ELECT 100U M 16VComment
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Re: Sanyo dp42840 cap exploded
Now thats what im talking about :-) that board looks just like it and as i thought its c 1660 but the other schematic was showing ceramic and i knew it wasnt.. this one shows Electrolytic and its a 100uf 16v thank you so much TWComment
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Re: Sanyo dp42840 cap exploded
cool found one in my parts bin let me install it and see what happens lolComment
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Re: Sanyo dp42840 cap exploded
now if im not mistaken the white dot signifies the neg pole of the cap and upon looking at c1664 apparantly the po soldered in that cap in reverse too which is probably why c1660 blew so if u guys agree even tho c1664 is not blown yet should i replace it or just reverse it?Comment
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Re: Sanyo dp42840 cap exploded
White marker lines up with white band which is Neg, other could be ok but if it looks like it's been removed and resoldered with the Pos at the marker I'd swap it around but would not hurt to replace it.Comment
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Re: Sanyo dp42840 cap exploded
ok well i did it n powered it on and no explosion this time lol but the tv is doing the classic power on/off symptom for this tv. i tried it 3 times i power it on relay click then powers off nothing on screen and 4th time it locks u out so u cant power cycle again till u unplug it and re plug it now to try and figure out what could be causing itComment
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