test y buffer for short? part# ebr38447802

[shelby5041]

was wondering if anyone could provide me with an easy way to test this y buffer for short

i have attached a photo

i do have a DVM

thank you

[shelby5041]

Re: test y buffer for short? part# ebr38447802

i did some research and saw some mentioning of the round copper pads and using diode test but that was for a diff part#,,,so not sure what do do here..any help would be appreciated

[tw2005]

Re: test y buffer for short? part# ebr38447802

Ok, unusual to start a new thread? but try setting the meter to diode/continuity, place one on the Vfg points where the screws would go and then slide the other probe slowly across the pin contacts for the panel ribbons and see if it shows short or constant beep.

[shelby5041]

Re: test y buffer for short? part# ebr38447802

ok doing that test upper buffer is shorted on one of the cable connectors...even the one i bought from shop jimmy and all are shorted on same connector location

[tw2005]

Re: test y buffer for short? part# ebr38447802

ok doing that test upper buffer is shorted on one of the cable connectors...even the one i bought from shop jimmy and all are shorted on same connector location

What do you mean on the same cable connector location? any chance a photo of how you did the test or of the bad connector?

[shelby5041]

Re: test y buffer for short? part# ebr38447802

i touched floating ground pad where screw goes then ran other probe alone each cable connector and on the last connector it had shorts....the connector where panel ribbon cable goes....there are 4 connectors.......this kind of backs up my tezy i did 4yrs ago the uppers were bad using a diff test ...coppell tv .....but the upper i got from shop jimmy is now appears to be shorted

[shelby5041]

Re: test y buffer for short? part# ebr38447802

if upper is shorted and lower not.....wouldny i get a pic on bottom screen and if upper is shortrd why isnt top half screen black?

[mmartell]

Re: test y buffer for short? part# ebr38447802

On some sets the signal cascades from top buffer to bottom. So short on upper means no pic because signal is not making it to the bottom buffer. And if top buffer not installed but good bottom buffer installed still no pic for same reason.

[shelby5041]

Re: test y buffer for short? part# ebr38447802

can anyone very how to tedt short on y buffer....i tried srtting to diode...then one prob on floating ground pad and other probe running across all pins on each ribbon cable connector and i keep getting readings on the top connectors which means shorted?....or am i doing something wrong?

[finntricky]

Re: test y buffer for short? part# ebr38447802

https://www.youtube.com/watch?v=51SZ...Y&noredirect=1
try that

[shelby5041]

Re: test y buffer for short? part# ebr38447802

yes i tried that and i also get readings which means shorted.......i put probe on any 1 of the input voltage pins and then other probe ran across each of the 4 ribbon cable connector pins and i do get readings.........

i jsut want to verify if this works on all y buffers and not jut certain ones

i bought it on ebay and need to verify board is shorted for a refund

thanks

[shelby5041]

Re: test y buffer for short? part# ebr38447802

i also used diode mode and probed 5v pin and then other probe on ground pin and i get a reading which means shorted correct???

[sordids999]

Re: test y buffer for short? part# ebr38447802

have you watched toms video?
you will here a beep once you run your multi meter along the pins which will highlight that you have a shorted buffer

[shelby5041]

Re: test y buffer for short? part# ebr38447802

beep/reading same thing

yes i have done this and i get a reading/beep when i run along pins on connector s for ribbon calbes '


one probe on ground and one probe on connector pins.........and i get readings on various pins so this means shorted????

[tom66]

Re: test y buffer for short? part# ebr38447802

Yes that would be a shorted buffer board

[shelby5041]

Re: test y buffer for short? part# ebr38447802

thanks

ok thats what i thought...bought it on ebay just got it and tested it shorted


have to ask for refund....seems the upper boards are more prone to short on this tv..is that an accurate statement

can i also test for short on buffer board by just probing 5v pin and probing gnd on same incoming power connector and if it beeps....board is shorted?

[tom66]

Re: test y buffer for short? part# ebr38447802

A lot of newer plasmas will damage the buffer board when the screen gets cracked... sellers stick them on eBay without testing them

No, you need to check to the output pins to be sure

[shelby5041]

Re: test y buffer for short? part# ebr38447802

by out put pins you are referring to the numerous pins on the 4 ribbon cable connectoirs?...if so what do i use for ground?...the gnd pin on the incoming power connector or the floating ground pads where the screw mount the board?

i used the floating ground pads....and gnd on incominmg pwr connector and came up shorted also


i did that.....

[tom66]

Re: test y buffer for short? part# ebr38447802

I use the floating ground pins to the output pins, yes those are the ones connecting to the ribbon connector.

[shelby5041]

Re: test y buffer for short? part# ebr38447802

and lots of sellers put z and y boards on ebay that are defective and they dont know that........its frustrating trying to troubleshoot tvs when boards you buy to try to fix...dont work.....