My tv stopped working this week, blank screen & no sound, but power OK. Took the back off and had a look at the main board. It looked OK at first, but when I had a closer look at the capacitors, saw that 5 of them had very slightly bulging tops. Think that may be the problem? I've sent for some replacements anyway, because if it's anything else it will be cheaper to buy a secondhand TV, rather than get this one repaired.
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Re: How bad does a bad cap look?
caps go bad BEFORE they look bad.
so if they look bad - they are very bad!
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Re: How bad does a bad cap look?
This! +1
This site has a resource on that: https://www.badcaps.net/index.php?pageid=identityLast edited by goontron; 08-21-2016, 03:07 PM.Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me
Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit.Comment
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Re: How bad does a bad cap look?
Thanks guys.Comment
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Re: How bad does a bad cap look?
I too feel your pain. After literally years of procrastination, I finally got serious about opening up my Sammy 61A750 DLP to do some long overdue cleaning and repair its increasingly noticeable "white dot" problem. This TV has VERY HIGH usage so in the back of my mind I "knew" there would be other (cap) issues once I got inside. Not only did I find numerous bulging PS caps (and I mean BULGING), I found one totally open (560 uf/200wv) and many more with bad ESR and/or capacitance levels. Needless-to-say, they are all now sitting on my bench with their legs in the air while I research replacements. Thank you "SAMWA" for years of service but you will be replaced with Pannys!!! Good luck on your set - don't give up..... repairs can be "fun"!Comment
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Re: How bad does a bad cap look?
For your viewing pleasure, here are some really bad looking caps.
https://www.google.com/search?q=capa...w=1030&bih=887Comment
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Re: How bad does a bad cap look?
How can we know the caps are bad if they don't look bad ?caps go bad BEFORE they look badComment
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Re: How bad does a bad cap look?
These are still working.Attached FilesComment
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Re: How bad does a bad cap look?
you may want to get something like this.
http://www.ebay.com/itm/222210243721Comment
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Re: How bad does a bad cap look?
+1
https://www.badcaps.net/forum/showthread.php?t=56932
no bulging. looks like new..All of bad 400 v.
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Re: How bad does a bad cap look?
Speaking of ripple sometimes the bestech psu powering it needs a little heat from a hair dryer to get going.
It needs some attention but so long as it doesn't catch on fire i'm not to concerned with it.
Wait actually i better get at it. I was going to move it to the garage.Last edited by junktv; 09-11-2016, 12:39 PM.Comment
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Re: How bad does a bad cap look?
You can say that again! I finally got around to updating 17 caps in a Gateway FPD2185W monitor and brought it back to life. Actually, I have six of them bought on the cheap from eBay. Manufactured around 2005, they were part of the great Capacitor Plague and people not knowing a capacitor from a resistor were dumping them in droves. Originally, these monitors were msrp at around $600. The LCD has Samsung stamped on it as well as the chassis but the power & video boards were made in China. Four of them are completely restored while one still has a vertical yellow line on the LCD. Another has a cluster of pixels stuck on gray. Both with defects however are still usable. You might say my hobby is keeping old junk alive.Last edited by Mint Waxed; 09-12-2016, 09:09 PM.Comment
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Rather than post in the PSU build quality pictorial thread, again I am splitting off the recapping info into its own thread. Also, I plan on doing some possible modding/experimentation on this PSU, so I figured that info would also be better to go here.
The PSU in question is this one:
Detailed post with parts and build quality is here:
https://www.badcaps.net/forum/showpo...postcount=3085
So this PSU has very simple output filtering: two 2200 uF caps on each major rail (3.3V, 5V, and 12V.)
Here is a cap diagram showing the caps... -
Hello everyone,
I'm trying to fix this SY-5SSM motherboard (Socket 7).
When the PSU is connected it powers on by itself but there's nothing on the POST card, no beeps.
The BIOS EEPROM is ok (latest BIOS was flashed).
All the jumpers are set ok.
All the 1000µF 6.3v (14) and 1500µF 16v (2) caps are in spec.
There are two 76129D MOSFETs (datasheet). I took them out and tested them and they are ok (no continuity from drain to source) in off state.
But the voltage in the gate of the second 76129D fluctuates between 1.468-1.649,... -
Hi there! One friend called to say his fancoill (used for a main access cold Air courtain) controller caught fire, and asking if I could recover the half burnt board
He said the design was too bad as this thing was probably designed for hot water only, as the board was places right underneath the condenser radiators
I found some burnt traces and after a quick Google search for the board name (Pwr-05v-w) I could see an image of the original I was able to find where the original traces were going
The scheme seems simple, from what I understand mains gets into the while 3 lead... -
Hey need a temporary solution for a emergency repair on these resistors this will not be long term but it will need to last a weekend in a cross over circuit. as I can't find these 66 ohm 20w valued resistors in Australia. The resistors are reading fine but I'm wondering what type of bonding I can use to stick these back together.... -
Hello,
I recently acquired a faulty Macbook Air 2019 A1932 with mainboard 820-01521-A.
Seller claimed that device just stopped working suddenly.
Device does not boot or give any signal of life other than the white led on mainboard.
Using cheap multimeter and microscope I went trough list of semi-random diagnostic steps:
Voltage measurements
Charger in USBC-B (closer to display) everything disconnected.
PP20V_USBC_XB_VBUS 20.7v
PP3V3_UPC_XB_LDO 3.25v
PP1V8_UPC_XB_LDOA 1.81V
PP1V8_UPC_XB_LDOD 1.80V...
Comment