42" rca 42pa30rq no picture but sounds working

[Jimmy60]

Re: 42" rca 42pa30rq no picture but sounds working

Unplug Y-main and check Vs voltage; if it's stable around 190-210V, PSU is probably good.

Tom, I've been trying to catch you. I can't get any voltage from my PSU on the VS terminals. Is that indicating a bad PSU?
I did disconnect the Y-Main

[tw2005]

Re: 42" rca 42pa30rq no picture but sounds working

Should The main logic control board have a green light that blinks when powering up and continues to blink? I have changed the x board y board and y buffer board and still have nothing. But after changing the y board it went from clicking 4 times to one when plugged in.

This TV also has the same boards. Relay clicks mentioned, 1 suggests Y buffer according to what's said.

Was yours definitely bad, maybe could swap. Chances of getting supplied dud boards seems fairly common unless you get them from reputable sources.

https://www.badcaps.net/forum/showth...t=36914&page=2

As for the logic board if the TV is running, it blinks about 1 / sec, If it's in protection I think 2 sec on, 4/5 sec off repeating,

[michajin]

Re: 42" rca 42pa30rq no picture but sounds working

Should The main logic control board have a green light that blinks when powering up and continues to blink? I have changed the x board y board and y buffer board and still have nothing. But after changing the y board it went from clicking 4 times to one when plugged in.

[capkid]

Re: 42" rca 42pa30rq no picture but sounds working

There are quite a few threads on these thin Samsung-based TVs (Samsung, Insignia, RCA). The power supplies rarely fail, and the Y-main or X-main (aka Y-Sus and Z-Sus) are usually at fault. Testing the components on the heat sinks for shorts is usually a good indicator of board health. Be sure you've checked both Y and X boards before making replacements. A bad Y can kill a good X and vice versa. I'd replace any buffers attached to a bad board, also. Component-level repair is NOT recommended.

[michajin]

Re: 42" rca 42pa30rq no picture but sounds working

I have the same issue with no picture but i have sound. i have inspected everything and do not see any burnt components. Could this issue be one the Y main?

[Gannon]

Re: 42" rca 42pa30rq no picture but sounds working

Is there anybody out there?!

I just looked at how this thread appears on the board...and it has a red flag.

I'm going to start a fresh thread. Sorry if I'm beyond protocol, as you can tell, I'm new here.

Cheers!

[Gannon]

Re: 42" rca 42pa30rq no picture but sounds working

I've got the same issue described above, in Aardvark's post.

Read through the forum postings while diagnosing the set, but had a wee bit o' confusion finding 207vDC and 54vDC, only realizing AFTER I'd ordered and replaced the Main control board, the power supply, and the X- & Y-mains that the new PS delivered both only for a short duration, if I didn't have my probe on the TPs upon plugging the unit in, I'd never see that those voltages quickly decay to nothing.

So...I'm four boards into ShopJimmy.com, who've been spectacular...but the only improvement I've got is a series of FIVE 'on-off' cycles upon plugging the unit in. The PS relay will click only once when I've got the X-main unplugged.

I did not see until late that I should've looked more closely at the X-buffer...but I'm at a loss how to test it, or how it may have affected the replacement boards.

Help?!

Thanks,
John
Detroit

[AardvarkAblaze]

Re: 42" rca 42pa30rq no picture but sounds working

Hi, I'm having the exact same issue the same model RCA. First, this forum is already an amazing resource as it given me direction on testing whatever has failed in the TV to replace it. Times are tough right now and I'd rather fix this than buy new, so thank you for that.

Anyway, no picture but have sound. Relays click on and off 3 times after powering the set on. Checked components and there are no burn marks or clearly apparent failed components. The relays do not click 3 times when the Y-main power is disconnected. However, this suggestion gave me pause:

Unplug Y-main and check Vs voltage; if it's stable around 190-210V, PSU is probably good.

When I checked Vs voltage, on power on it will read 207vdc, but after a few seconds it drops to 0. Is that something to be concerned about? Should I still be looking at replacing just the Y-main or should I also be thinking about replacing the PSU?

[Louis82]

Re: 42" rca 42pa30rq no picture but sounds working

UPDATE: The guys from paylesscomponents kindly sent me out new boards and that was it. My tv is working great. Using my Digital Meter and comparing all boards i found that the first X board and Y board they sent out had defective mosfet ic's. Thank you CAPKID for trying to help.

[capkid]

Re: 42" rca 42pa30rq no picture but sounds working

hello, I have this same model RCA and it has sound and no picture and when I turn it on it clicks then clicks a bunch of times and there's no picture just like sfdskins, I dont know anything about televisions but upon opening the back of the tv I found a small rectangular blue box which is clearly burnt, is replacing the part worth it since something clearly burnt it up and will probably burn the new one, and my lack of knowledge on the subject makes me ask if buying the part is worth it, any thoughts?

On which board is the burned component located? Please post a pic.

[OtterBob]

Re: 42" rca 42pa30rq no picture but sounds working

hello, I have this same model RCA and it has sound and no picture and when I turn it on it clicks then clicks a bunch of times and there's no picture just like sfdskins, I dont know anything about televisions but upon opening the back of the tv I found a small rectangular blue box which is clearly burnt, is replacing the part worth it since something clearly burnt it up and will probably burn the new one, and my lack of knowledge on the subject makes me ask if buying the part is worth it, any thoughts?

[Louis82]

Re: 42" rca 42pa30rq no picture but sounds working

When you installed your replacement boards, did you install them all at once?

Yes i did. Thank you

[capkid]

Re: 42" rca 42pa30rq no picture but sounds working

Hello, I have a samsung pn42c450b1 that has no picture, no sound, it only clicks. Based on all the threads that i have read here, this tv has same circuit boards as RCA 42PA30RQ. I followed what some people have done and has worked them is replacing all 3 circuit boards. Y buffer, Y main and X board and still have same problem. At beginning i found that buffer board had a dark dot on a capacitor, removed glue and of course was physically burned.

Anyhow, i replaced all 3 circuit boards and still same. Any suggestion guys ? Is it possible that paylesscomponents.com sold me a defective board or is this a panel problem.

Thank you for your time and help.

When you installed your replacement boards, did you install them all at once?

[Louis82]

Re: 42" rca 42pa30rq no picture but sounds working

Hello, I have a samsung pn42c450b1 that has no picture, no sound, it only clicks. Based on all the threads that i have read here, this tv has same circuit boards as RCA 42PA30RQ. I followed what some people have done and has worked them is replacing all 3 circuit boards. Y buffer, Y main and X board and still have same problem. At beginning i found that buffer board had a dark dot on a capacitor, removed glue and of course was physically burned.

Anyhow, i replaced all 3 circuit boards and still same. Any suggestion guys ? Is it possible that paylesscomponents.com sold me a defective board or is this a panel problem.

Thank you for your time and help.

[tom66]

Re: 42" rca 42pa30rq no picture but sounds working

No direct SM available, but the PN42B450 is a similar model and the service manual should be OK for that.

[dwdurko]

Re: 42" rca 42pa30rq no picture but sounds working

Can you advise where to obtain a service manual for this model 42pa30rq

[capkid]

Re: 42" rca 42pa30rq no picture but sounds working

Shopjimmy.com is your best bet. Their boards come with a 6-month warranty: http://www.shopjimmy.com/catalogsear...lt/?q=42pa30rq

[ezm420]

Re: 42" rca 42pa30rq no picture but sounds working

Hi sfdskins I have the same TV and same problem. Could you please tell me were you purchased your new boards? And think you for your posts they helped a lot.

[sfdskins]

Re: 42" rca 42pa30rq no picture but sounds working

Thanks for your help tom,
I got the y-main board in tonight, and that was the problem. My thinking on it is the y buffer board cap that was burnt, shorted out and took out something on the main board. what do you think? i had to reseat some connections to the ribbon cable on the buffer board because when the screen first came up had some black bars in line with the connections, was able to get that out and picture looks great now.
Might would like to look into it more and find the bad coponent on that board at some point but not ready to do that just yet,
Again thanks for you help on this, i learned alot about how thew tv works and feel cofident i can fix it again if i have another problem. Couldnt have done it without your help and the service manuals you got for me.

[sfdskins]

Re: 42" rca 42pa30rq no picture but sounds working

Tom,
i upluged the y-main power plug and checked the voltages, The excess clicking from the relay stops when unplug it by the way ,sonds like normal operation, When i cut the switch on, Vs voltage goes to a steady 207vdc and Va goes to 54vdc also steady, but after about 5 seconds the voltage starts to drop out or dissapate slowly to 0, this maybe be normal because where it doesnt see the y-main board? not sure.