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Crumbtrail TV Forums: TV Equipment: LCD TV Forum:
BenQ monitor psu, cap identification

 

 


Schottky
New User


Dec 3, 2016, 6:02 PM

Post #1 of 8 (534 views)
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BenQ monitor psu, cap identification Can't Post

The monitor in my workshop stopped working, so i'd thought i'd investigate why, no power light, so i suspected the psu.
Once removed i found IC601 had blown a leg, the diode D601 had fried and there are signs of burning to capacitor C609. its a 102J (1000pf)
What i want to know is, what kind of capacitor is it ? To me it looks like a metalized polypropylene. How do i know if it is ?

Regards,

Dave



jts1957
Veteran


Dec 3, 2016, 6:36 PM

Post #2 of 8 (526 views)
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Re: [Schottky] BenQ monitor psu, cap identification [In reply to] Can't Post

Look it up in it's service manual?

Post a picture?
Unimpressed


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Location: Far, Far Away


Schottky
New User


Dec 3, 2016, 7:02 PM

Post #3 of 8 (521 views)
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Re: [jts1957] BenQ monitor psu, cap identification [In reply to] Can't Post

Hi, i dont have a service manual for it, i have taken a pic heres a link to the pic..
http://pinx.me.uk/wp-content/uploads/2016/12/Benq_psu.jpg


(This post was edited by Schottky on Dec 3, 2016, 7:31 PM)


jts1957
Veteran


Dec 3, 2016, 7:57 PM

Post #4 of 8 (503 views)
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Re: [Schottky] BenQ monitor psu, cap identification [In reply to] Can't Post

Identifying info off the board or the back of unit might allow others to search for info.


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Location: Far, Far Away


Schottky
New User


Dec 4, 2016, 5:54 PM

Post #5 of 8 (485 views)
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Re: [jts1957] BenQ monitor psu, cap identification [In reply to] Can't Post

Thanks for replying,
The model ID is ET-0027-B and the type is G2420HDBL it was manufactured in Oct 2011, i found a service manual on line, but it doesnt have a component parts list on it
Looking at the schematics all the burnt parts are part of the PWM circuit, except C609, so maybe its not damaged anyway, just showing smoke marks from being near D601


(This post was edited by Schottky on Dec 4, 2016, 6:45 PM)


Schottky
New User


Dec 4, 2016, 6:38 PM

Post #6 of 8 (481 views)
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Re: [Schottky] BenQ monitor psu, cap identification [In reply to] Can't Post

I also see theres a Zener protected Mosfet at Q601, which is linked to D601 the diode that has burnt, can i take Q601 out of circuit and test it with a DMM like i would any other transistor ?


jts1957
Veteran


Dec 4, 2016, 6:51 PM

Post #7 of 8 (475 views)
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Re: [Schottky] BenQ monitor psu, cap identification [In reply to] Can't Post

Is possible.


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Location: Far, Far Away


Schottky
New User


Dec 18, 2016, 11:10 AM

Post #8 of 8 (442 views)
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Re: [jts1957] BenQ monitor psu, cap identification [In reply to] Can't Post

I have now fixed this monitor, i replaced IC601, D601 and the pcb mount fuse, whilst i was at it i replaced all the radial electrolytics too, with Panasonics..

 
 
 


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