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UserName666
Senior Member
Last Activity: 11-10-2010, 12:29 PM
Joined: 08-30-2010
Location: Winnipeg, MB Canada
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    And the result is......Daytek = Fixed....BenQ = Fixed I am back to dual monitors!!! HUGE improvement over the single IBM C51 lol

    BenQ was a walk in the park because there was a previous thread on that monitor that explained the problem as well as a protection circuit. [url]https://www.badcaps.net/forum/showthread.php?t=4304[/url] When I get another LCD I am gonna take the BenQ down and have a stab at the protection circuit.

    As for the Daytek, this has been hell and back lol. The 471k caps I ordered, I tested 4 and they all turned...
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    I will get some of those caps along with the D444. Both those are readily available on ebay.

    (Off topic)
    I just cracked open a benq monitor today with no backlight.
    There is actually a repair *KIT* available on ebay for this one

    [url]http://cgi.ebay.com/REPAIR-KIT-2SC5707-C5707-E172FP-E173FP-BenQ-FP731-/220486136091?pt=LH_DefaultDomain_0&hash=item3355ff711b[/url]

    I also found a complete service manual for the BenQ in less than 5 minutes.

    If only this Daytek was that simple lol Re: Daytek...
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    It would appear they are
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH



    Actually the resistors and caps were all pulled for testing....
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    OK I could not get anything to happen with the caps on resistance mode on both the digital and analog meter but when I put the digital to capacitor checker the one on J14 side read .34nF and the one on J15 side read .37nF.
    The numbers on the caps are:
    471k
    1Kv

    The resistor on J14 side is 33.8ohm and by J15 is 33.4ohm

    Pulling the inverter transformer not surprising the dark scorch mark is on the same side as the shorted transistor....
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    OK I am gonna go ahead with these D444's. I had another look at the board and the only real difference between mine and the original post other than the transistors I can see is the stickers/markings that were added to the board afterwards:

    -Number stamp on filter cap (Original post 5718D - Mine 5914D)
    -Number stamp on transformer (Original post L0525 - Mine L0528)
    -Barcode sticker underneath the board (Original A30534134542 - Mine A30544023768)
    -Sticker by inverter (Original R0194L7200 - Mine 83A000013)
    -Sticker between...
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Hmm OK. Umm does the D444 look suitable. I'm at a loss with all those terms on the data sheets ie: "drain source on state resistance"...Not a clue lol. I have never gone this deep into circuitry. I was just trying to match the numbers on the sheets and is seem the D444 has a few values that are a little higher.
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Something else I just noticed. IDK if this means anything the datasheet for the for the 4060AL is dated March 1998 while the one for the D444 is dated June 2004 so I would guess that the D444 is the improvement over the 4060AL???
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    After a bit of digging around I looked at the Post #1 in this thread. How I thought these to PS boards were alike it seems there is indeed a difference. The drive transistors in that pic that I can make out are:
    D444
    US?822

    4060AL -
    D444 -

    Does it seem like a D444 could be suitable replacement?? If so I have readily found some on ebay and the auction says "This MOSFET transistor can be found in Xerox, Mag Innovision, and Proview LCD monitor."
    [url]http://cgi.ebay.ph/LOT-4-AOD444-N-Channel-Enhancement...
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    I got one of those SMD hot air blowers so removing it will be no problem. The problem I am having is I have already been looking for a replacement and this part is proving difficult. 0 results at digikey, findchips gives me a 14 pin IC ect.

    Could you possibly tell me a little more about the "drive signal path"?
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH



    I was thinking the same about Q13. Just for laughs and out of boredom I disconnected the bench PS and plugged the monitor PS into 110v with it all hooked up except the CCFL's and J109. Monitor functions as it should....
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Q13:
    1-top = 0 ohm
    2-top = 23.8 ohm
    1-2 = 0 ohm

    Q14:
    1-top = 27.6 ohm
    2-top = 23.9 ohm
    1-2 = 4.6 ohm

    Q13 & 14 tested in board

    IC1=
    0Z9932GN
    43014823T
    D517A

    IC4:393A
    E26A
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    OK which transistors would you be referring to?
    -Q101 by the filter cap
    -IC103 between transformer and the heatsink
    -All the little surface mount ones underneath labeled "Q" (16 of them)
    -The 2 driver transistors for the inverter
    -All of the above
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    The result of removing J109: Powersupply went up to 12 volts and when I got to .29amps the power LED came on green and I head the audio circuit fire up through the speakers and after about 3 seconds the power led went to orange indicated no input which is correct operation for this monitor!!!! The power button also functions in this state as well.
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    Last edited by UserName666; 10-11-2010, 01:37 PM.

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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    OK I decided to go the way of hooking wires to the pads. As I was increasing the voltage the PS started to buzz louder and louder and by the time I got up to 4 amps I only had 3.1 volts output from the PS. Only thing I noticed was the parts circled in red got really hot. Attempted to push power button with no result. By PS I mean the external desktop supply.
    (The again I have never used one of these kinds of PS before so maybe I'm doing/adjusting something wrong with it?)

    Also not that this really matters but I think this monitor is a remake of...
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    Last edited by UserName666; 10-11-2010, 08:33 AM.

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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    OK I wont do anything yet but just for the record...

    "OR (and this is very dangerous), using it to provide DC power to the SG6841SZ."

    I don't know if your meaning blowing something else up on the board or frying the new SG6841 I put in but if it just a concern for the chip I bought a 10 pack so I still have 9 more to play around with.
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Could you possibly explain you last post a bit more? Does that mean the secondary of the transformer in not providing the voltage to pin4 of IC101? IC101 being the SMPS controller? Confused here.
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    It was this exact unit here. Just a cheap direct from Hong Kong thing but it does what its supposed to.

    [url]http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=150501632382[/url]Re: Daytek F19AH<br /> <br /> It w...01632382[/url]
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Alright something I tried today was removing the 10uf cap next to the big filter cap since that is the only one that wasn't replaced brand new and still no go. According to the analog meter when this cap fills up the transformer clicks at the same time it discharges back to 0.

    When around the board again and took some voltage readings again after installing the new SG6841.

    IC101:
    1-2 = 0~1.3v
    1-3 = 11~19v
    1-4 = .000~.298v
    1-5 = 1.1~1.9v
    1-6 = .000~.030
    1-7 = 10~16v
    1-8 = .000~.457v

    ...
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  • UserName666
    replied to Daytek F19AH
    in Troubleshooting Computer Displays
    Re: Daytek F19AH

    Did not work Still no output voltage from the transformer though it remains clicking. IC101 now has it's 15~19v input voltage back and voltage has also returned to pins 1-2 of the opto-isolator but monitor still will not power up.
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