Lost chip resistor, need help with value

[hill8570]

Hey, all! Noob here, with a weird request...

I was recapping a TDK XAD819AR power supply out of a Hanns-G HC194D LCD monitor when I managed to knock loose and lose a little chip resistor in the middle of the back of the board -- looks like resistor R18. I figure I should be able to hack in a small 1/8W resistor in place of the chippy if I knew roughly what value it was, but I haven't been able to track down a service manual or schematic for that board, and haven't even been able to find an app note for the little SMD-8 SC6841SZ MOSFET driver that the chippy was next to.

Does anyone happen to have a schematic for that board, or maybe one of those boards out on the bench so you could check to see the value of the chip resistor? I'd let you have my firstborn male child, but he's a pretty obnoxious teenager, so you'll have to settle for my eternal gratitude.

[mockingbird]

Re: Lost chip resistor, need help with value

I have this board.
XAD819AR
EA02819x

R18 says "10R0" on it if that means anything to you.

Now if you could help me out, I don't know which capacitors to get for this board, I took them all out when I tried to repair it and failed. Would you be able to tell me what caps it has?

All I got was a white screen after I changed the caps.

[hill8570]

Re: Lost chip resistor, need help with value

10 ohms...cool -- that'll be easy :-)

Value-wise, my board had:

2 - 10V 1000uF
2 - 25V 470uF
2 - 25V 220uF
2 - 25V 100uF
1 - 10V 100uF
1 - 50V 47uF
1 - 50V 4.7uF

A lot of the CapXon-branded capacitors were bulging, but just to be on the safe side I changed out all of the little electrolytics, CapXon or no.

There was also a big ol' 100uF 400V filter cap over near where the line voltage came in...that guy looked OK, so I didn't mess with it.

[mockingbird]

Re: Lost chip resistor, need help with value

[mockingbird]

Re: Lost chip resistor, need help with value

Can you give me also the locations? Also, what are the locations and values on the logic board. Series is also important if you don't mind

I know it's asking a lot.

Yea, the 400v 100uF Taicon is still there. I am gonna change it too when I get working on it again, because I haven't had good luck with Taicon primaries. Has been sitting here for months.

[hill8570]

Re: Lost chip resistor, need help with value

Here's the power supply...assuming it uploads OK. Might not get the logic board posted until tomorrow...getting to be beddy-bye time. Not sure what you mean by "series".

[mockingbird]

Re: Lost chip resistor, need help with value

By series, I mean, on the capacitors, it should say something like "KF" or "GF" or something like that.

[mockingbird]

Re: Lost chip resistor, need help with value

Also, here is the same photo with better clarity. Can you tell me if I read your photo correctly?

[hill8570]

Re: Lost chip resistor, need help with value

Also, here is the same photo with better clarity. Can you tell me if I read your photo correctly?

You've got good eyes. Yes, those are the correct values.

Other than the Taicon, all the capacitors I have in there now are Panasonic FM series. If you need to know the manufacturer & series of the originals, let me know -- I probably haven't emptied that trash can yet.

[hill8570]

Re: Lost chip resistor, need help with value

Here is the logic board. Hopefully this pic is better than my first attempt.

[mockingbird]

Re: Lost chip resistor, need help with value

Thank you very much, the picture is a lot clearer.

Our logic boards are very similar, the physical dimensions, connector positions, etc... But they are slightly different.

Yours is:
DAL9ZCMB124 Revision B
Mine is:
DAL9TAMB1A1

Unfortunately the cap layout is different on mine. I'll see if I can get one like yours somewhere, maybe it will also solve my problem.

Let us know how the recap goes.

[hill8570]

Re: Lost chip resistor, need help with value

The recap went fine...the 10ohm resistor I hacked in was one of my uglier pieces of rework, but it's getting the job done. The monitor is back in service, and now working perfectly.

BTW, I checked the trash, and the majority of the original caps on the power supply (including all of the bulging ones) were CapXon GF series. A couple (the 47uf and the 4.7uf) were TL CD81 series.

Thanks for all your help!

[mockingbird]

Re: Lost chip resistor, need help with value

No, thank you!

This is very helpful. I will check GF spec to see if FM is an exact replacement. But hey, it's working, so the proof is in the pudding.