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Author Topic: makvision 2929 blowing HOT  (Read 1413 times)

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RichSorr

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makvision 2929 blowing HOT
« on: August 14, 2015, 08:19:42 am »
I have a makvision C2929D that keeps blowing the HOT and burning up the 1k resistor at R68. Any suggestions as where to look next?

When I turned it on after replacing those parts I got a high pitched squeal and a few clicks followed by a puff of smoke from the resistor.

any help is appreciated
« Last Edit: August 14, 2015, 08:28:31 am by RichSorr »
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grantspain

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Re: makvision 2929 blowing HOT
« Reply #1 on: August 14, 2015, 01:24:42 pm »
check q20
this could be flyback
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RichSorr

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Re: makvision 2929 blowing HOT
« Reply #2 on: August 14, 2015, 01:52:06 pm »
q20 seems OK. The HOT shorts immediately and the resistor smokes, but isn't an instant failure. d21 is fine also.

I
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grantspain

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Re: makvision 2929 blowing HOT
« Reply #3 on: August 14, 2015, 02:12:42 pm »
check the high voltage caps at c81 and c75
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RichSorr

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Re: makvision 2929 blowing HOT
« Reply #4 on: August 18, 2015, 07:29:28 pm »
no luck with those caps. I replaced everything once more and still have R68 smoking with some high pitch whines and clicking. Oddly enough I pulled the HOT off and it tested fine this time around.
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grantspain

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Re: makvision 2929 blowing HOT
« Reply #5 on: August 18, 2015, 08:25:23 pm »
i would be looking at flyback but i do not have much experience with these chassis so maybe someone else can help further
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RichSorr

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Re: makvision 2929 blowing HOT
« Reply #6 on: August 23, 2015, 12:53:19 pm »
I couldn't put anymore time into it. Installed a 26" LCD and will save the chassis for a rainy day. thanks for the help
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