RCA 42PA30RQ Clicking Relays

[RedeyeJay]

ok so i got this TV from a customer of mine when delievering his new couches
im some what savy as far as electronics go but this is my first REPAIR on a LCD tv

I ordered a new power supply from Shopjimmy.com

Didnt fix the problem. when i disconnect the X-Y main board it doesnt continuously click like it will when its all hooked up , and i have no backlighting no picture , havnt hooked it up to anything yet as far as computer to see if im getting sound or not ,

reply to this thread if u think u might beable to help me out here id really love to have this TV fixed for under 100 $ total would be a nice gift for my wife since all we currently have is a 32" vizio which is a great TV set i must admit 3 + years now of constant use and no issues ever !

[tom66]

Re: RCA 42PA30RQ Clicking Relays

Well, a good start would be to note this is a plasma, not an LCD. It does not use a backlight.

If it stops clicking when X-main disconnected, the X-main is bad and should be replaced.
If it stops clicking when Y-main disconnected, the Y-main is bad and should be replaced.

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

its the setup were the X board is driven with power from Y board , i looked at several of ur trouble shooting tips i tested buffers for shorts with my Analog meter and the ohm resistance was the same on all pins from Y board pins to buffer board , im stumped atm with why its shorting out i read the entire thread with u and Bling

i appreciate any more help u have for me as im 50 $ into this set already and want to keep costs under 100 $ if at all possible

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

when the main power for Y board is diconnected it doesnt click like it does with it connected , ive tested alot of the little blue caps for ohms i believe its a "Good" reading , but like i said im kinda a newbie at this , im great with building computers and software , hardware troubleshooting is new to me entirely

[Alastair E]

Re: RCA 42PA30RQ Clicking Relays

Cant test caps effectively with old-fashioned analoge meter. You need an ESR meter for caps or substitution.

So--dis the X board from the Y and try again--Does it still trip (click)?

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

ya it still clicks with X board disconnected

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

and the meter im using is a M1015b commercial

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

should i order the Y Main board , and if so what website do u trust ? i used SJ.com for the power board , they seem to have a full menu of all the parts for this model and decent prices also i must add ... 22 $ for Y main board

[tom66]

Re: RCA 42PA30RQ Clicking Relays

You will need to remove the Y-buffer completely to test it.
https://www.youtube.com/watch?v=51SZsfH60EY

[Alastair E]

Re: RCA 42PA30RQ Clicking Relays

Diagnosis indicates fault is on YSUS.

That analogue meter is Not suitable for testing caps nor is it accurate enough to set the rail voltages in Plasma sets.

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

Ok I went and got a digital meter it's not the fancyest but igot a manual for this as I didn't for analog what setting should I use to test the y buffer boards pins ?

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

Cen tech model 92020 is the meter was 5$ on sale lol

[tom66]

Re: RCA 42PA30RQ Clicking Relays

Does your meter have an audible continuity mode?

If not, you will need to set it to 200 ohm and run it slowly along each pin (one per second) checking for any reading other than the normal "1".

If it does have the audible mode, you can use that to hear a beep when a short is encountered, which allows you to more easily find a fault.

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

O and I checked the old power supply the tv had same thing only got the 1 set of click to turn on so I'm going to send back the other 55$ power supply gotta pay a 20% restock fee but if I can just use the rest of the money to buy what I actually need I think ill still win , and I also read ur post about plasmas and how they work is it easy to spot cracks ?

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

No it doesn't that one was like 20$ I should've gotten that but bills came up lol

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

What's the easiest way to seperate the white connectors from buffer to y board ?

[tom66]

Re: RCA 42PA30RQ Clicking Relays

You pull on them. Sometimes the Y-board has to come out.

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

Pulling won't damage it ?

[tom66]

Re: RCA 42PA30RQ Clicking Relays

Be careful, but no, it shouldn't damage it.
The panel connectors (orange) are the ones to be careful about.

[RedeyeJay]

Re: RCA 42PA30RQ Clicking Relays

Ok here goes nothing crossing toes n fingers