Author Topic: Broken Cap - unknown value  (Read 901 times)

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Offline kvviinguTopic starter

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Broken Cap - unknown value
« on: May 06, 2019, 10:48:12 am »
Hello!
I am new to electronics and I had problem, where my TV stopped working. Backlight was okay, sound was fine but TV blinked error code stating: T-Con failure.
Without much thinking I decided to disassemble TV and take a look at this T-con board.
I noticed shattered cap, no continuity. I desoldered it from PCB and wanted to figure out replacement part and hell started.

T-Con model is BM41-01797A aka. FHD-60Hz-V03, broken capacitor (CG02) was next to I7939A (at bottom N227NPY) chip that I also couldn't find any data sheet regarding it's usage and pinout (I guess it's a voltage regulator) so I can't really figure out what the hell is going on here.
I attach picture of the T-Con with spot on where the cap was:

Thanks in advance for any help  :)
 

Offline mariush

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Re: Broken Cap - unknown value
« Reply #1 on: May 06, 2019, 11:05:41 am »
I'd measure the capacitance of other capacitors of similar size and height.  I suspect it's something like 4.7uF .. 10uF

I think there's two ceramic capacitors in parallel somewhere in the bottom left corner in your last picture, I think C29 and C47

If they're really in parallel ... I don't think it would hurt anything to desolder one, measure the capacitance and solder it to your missing location as an experiment to see what happens.

The circuit at the bottom may require the capacitance of those two capacitors in parallel so your tv could act funky / glitchy / whatever, but at least you'd see if you still get that T-Con failure error.
 

Offline kvviinguTopic starter

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Re: Broken Cap - unknown value
« Reply #2 on: May 06, 2019, 11:47:36 am »
Hi, thanks for your reply!
Well, before I read it i just went YOLO and soldered some random capacitor from old HDD controller board and... it worked :D

Thanks anyway, that was my 1st PCB "repair" and I could get new t-con for like $7 :)
 


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