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bottleneck
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Last Activity: 09-29-2013, 11:41 AM
Joined: 11-12-2012
Location: oregon
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    I wanted to report back that my television is fixed!

    Due the the generous efforts and dedication to the following...Budm, RetiredCaps, and Tom66.

    I have learned alot from you all and hope that some day i can return what you have dedicated for others...

    I ended up ordering a Power supply. The model PLHL-T848A is a replacement or compatible model for this television. It is working great! I did find out through this that i really enjoy the challenge and look forward to saving...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    Francisco that is correct. the code of my psu is [B]API5ST06-291G[/B] It sounds as though there is a difference after all. Did you test all caps on the secondary side?

    Toasty... Do you have any idea where to proceed? you are the veteren here after all. and i am definatly the young... ok, not so young grasshopper.

    Thanks for any help!Re: IMAC 24 PSU Bad Caps replacement



    Francisco that is correct. the code of my psu is [B]API5ST06-291G[/B] It sounds as though    ...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    I apologize for the delay on the picture, i havent had time to get back here. I have included it now. Let me know if you need more.


    Can either one of you clarify a little on what i should check next and or how. You both obviously are more advanced than i am and i want to make sure I am not chasing my tail.

    Thank you...
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    Last edited by bottleneck; 02-14-2013, 08:37 AM. Reason: addition

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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    Toasty... ncp1381 is located under what I'm guessing is supposed to be a heatsink. The Copper thing in the center of the board. I could retake a picture with it lifted up if it will help.



    Yes C53 is the correct cap in question. I noticed there is something under some silicone as well VR1. would this be a regulator? It doesn't look like anything I have seen before, its completely metal. Rather than march ahead, I was hoping that you might have an idea?

    I've been looking for a value...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    I checked D9, it looks like the following(four lines on top) of A6

    =
    =
    A6

    It measures (in circuit) .555 v one direction and OL the other using the diode test with my dmm. Doesn't that mean it should be functioning correctly?


    The grey goop guy is:

    TL431AC: datasheet included.


    The others are as follows:

    M6: fc762
    m9: fc762
    m10: Lm393

    I have included couple of the datasheets. not sure...
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    Last edited by bottleneck; 02-11-2013, 12:39 AM.

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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    Wow! after some inpection i noticed what appeared to be an area that got hot.This is the general area i thought i heard the noise comming from on the other side though. If you look at the pictures one of which i have an arrow pointing to the componant. Is this a resistor? The numbers appear gone now, i cant make anything out.

    With my meter set to ohms it reads .472 k both directions. Is this right, or is there another way to check this?

    Do you have any ideas as to what to check next or what the replacement...
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    Last edited by bottleneck; 02-07-2013, 09:21 PM. Reason: addition

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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement



    I did email them for a schematic of this psu. I didn't receive a response and wasn't successful in finding one. From what I have read, they don't typically give them out... Any suggestions?...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement

    I apologize for the delay in getting back to you guys and appreciate your feedback!

    I have installed the caps correctly polarity wise. I am limited in understanding the theory behind cap series differences and ESR levels. I have an interest in this level of troubleshooting and read as much as time allows.

    I replaced the 22uf 50v cap with the recommended P15374CT-ND panasonic it lasted about 2days then the computer wouldn't startup.

    I checked the cap with a volt meter(I know its not accurate) its...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement

    I appreciate all of your help! I have run into another issue.

    The power supply worked for a short time and then quit. I have replaced the other 3 caps as Toasty suggested and it resulted in it working again. I could hear a high pitch noise coming from a section of the psu while it was plugged in but turned off. It worked for a couple of days and then dead.

    It keeps killing the 22uf 50v cap.

    Any ideas??

    Thank you!!
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight



    This is what i had read in some of your other posts. Is there anything that stands out i could test, or should i replace the cap and see?



    I have been looking for one and believe i can get one for around $70 - $80. I would hate to order one and have it not the issue.

    I respect your opinion....
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    [QUOTE=retiredcaps;292232]It didn't dawn upon me early, but a simple test would be to disconnect all your boards. Use 2 AA batteries in series or a single 3V CR2032 battery and apply 3V to the PS_ON pin. If the power board starts, then you know 3V is required.

    To verify, get 2 weak AA cells so they are approximately 2.25V in series and retest.
    QUOTE]

    Great Idea! I tried this with both new AA and used AA batt(from a remote). No change. I did notice that when i turned it on the 12v side goes up to...
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    I realize i should have done a little more reading before posting. I am sure this helps reduce confusion of inacurate posts by the information being in the proper format. I could use some help as to where and what to look for next.

    I followed the instruction by retiredcaps concerning regulators(I should have read this first)!

    See the information below:

    U2
    L271
    G9117
    pin 1 = 2.03
    pin 2 = 3.28
    pin 3 = 5.17

    U3
    1084
    0932dl...
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Vizio sv421xvt No Video, Audio or Backlight

    I did some checking on the power supply. I noticed a couple of ceramic caps didnt have any resistance. From what i have read this could be because i only was using a DM. could someone verify if this is true?
    I checked for voltage accross the legs Powered on/off and only got 120voltage on one of them (see photos) could this be the problem? if so what would the replacement caps be? I am hoping for some more instruction from the experienced ones.

    Thanks!...
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    I did some more checking. I have included voltage measurements and some numbers off of the chips. Let me know if i need to clarify anything? I also tried to take a measurement off the main cap on the power supply. I wasnt sure which side this was on. It looks to me like the AC side I am reaching the limits of my componant ability at this point. Please clarify if i am incorrect. I was careful as i know that we are dealing with high voltage. I was sure that I was only touching the legs of the capacitor.

    With my meter...
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    I realized i didnt add the bottom. Sorry about the flash, if it poses a problem i can retake it later when there is daylight. I guess i was focused at the componant with no reading. of course you have been doing this for awhile....
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  • bottleneck
    replied to Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources
    Re: Vizio sv421xvt No Video, Audio or Backlight

    Thank you both for jumping in here! I have included more pictures of the power supply let me know if you need more(it doesnt look like i can get the heatsink out of the way short of removing everything).

    I appologize for my lack of detail. The last thing i want to do is waste time going down the wrong road. I know your time is valuable! I have included the information i left out of my first post. Let me know if i missed something.

    J1 - stndby
    p10 - 5.19v
    p11 - 5.19v
    p12 - 5.19v...
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  • bottleneck
    started a topic Vizio sv421xvt No Video, Audio or Backlight
    in Troubleshooting TVs and Video Sources

    Vizio sv421xvt No Video, Audio or Backlight

    I have a 42" Vizio that stopped working, it appears to be common from what i have been reading. I have read alot of threads on here concerning these boards. There is a wealth of information and knowledge. I havent found out what my issue is as i am limited when it comes to component level troubleshooting. I have a desire to learn and appreciate the wisdom from the members hear! I have included photo's and the troubleshooting diagram from the service manual I followed. The Vizio emblem is yellow in standby and white when powered on. I am hoping someone here can help me get this tv working...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement

    Thanks for adding that,I appreciate all the helpful information on this forum! What would be the best replacement for the remaining 3?

    They are:

    22uf 50v LZG
    220uf 35v LZG
    1000uf 35v LZG

    Would you use a different series than fm or fr?
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Update:

    I just wanted to update this as I have made the repair. Thanks to Sam Sam for his reply and a somewhat confusing scour of Digi-key's website I was able to purchase these items for the previously mentioned board.

    (2) P12368-ND CAP ALUM 1500UF 16V
    (2) P14398-ND CAP ALUM 1000UF 16V
    (1) P14396-ND CAP ALUM 680UF 16V

    I was hoping to get more direction here as to which model numbers would be the best, or recommendation of items from badcaps to order. I didn't, so I just made a selection after a lot of reading. As I stated previously...
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  • bottleneck
    replied to IMAC 24 PSU Bad Caps replacement
    in Troubleshooting Power Supplies and Power Supply Design
    Re: IMAC 24 PSU Bad Caps replacement

    Thanks for replying!

    So do you believe the caps look bad? I know you cant always tell by looking but im not real experienced when it comes to these. It appears that this is the information on the caps (below). my measurements appear to be different than TBI's (above) but the board numbers match what he had so I could be off a little. Please let me know if you need any more additional information. I would appreciate if someone could suggest the replacements that would be best.


    680UF 16v LXY 10mm x 14mm...
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