RCA P52929 Dead

**PlainBill** · 03-21-2011, 07:09 AM

Re: RCA P52929 Dead

Originally posted by maybenever

This TV was connected to a sat. receiver. It was on channel 3, then it started going thru the channels, like a search. It then powered it's self off. Would not power back on.
A few hours later, It powered back up and worked fine for several days, then same thing happened, only now it will not power on at all.
I've checked the main power fuse, it's OK. I can see a resistor on the board that looks bad. (I marked it on the pic), but I can't get the board all the way out because of the other part I've marked. (don't know for sure what it is).
Does this look like something for a DIYer should attempt?
Thanks for all input

It depends on the DIYer. Some barely know which end of a screwdriver to hold, others could diagnose the problem and suggest an improved design before they got the chassis out.

Seriously, it depends on your tools. Looking for obviously discolored or damaged components is a valid troubleshooting approach. Replacing components because they 'look bad' without first confirming they are in fact bad is unlikely to be successful.

Do you have a DMM and know how to use it? Can you detect a shorted transistor? Do you have good soldering skills? If the answers to all three questions are 'No', I'd suggest you don't have the skills to fix this.

To cover two of the issues, the proper technique is to stand the chassis on it's side to work on it. And the part preventing you from removing the chassis is called the flyback.

PlainBill

**maybenever** · 03-21-2011, 07:28 AM

Re: RCA P52929 Dead

never checked a transistor, but yes to the other two.
I've repaired a Tv, dvd player, and a settop box.

**PlainBill** · 03-21-2011, 10:51 AM

Re: RCA P52929 Dead

Originally posted by maybenever

never checked a transistor, but yes to the other two.
I've repaired a Tv, dvd player, and a settop box.

Give it a go. Perhaps someone can direct you to a service manual; I just drew a blank at my usual source.

PlainBill

**maybenever** · 03-21-2011, 11:55 AM

Re: RCA P52929 Dead

I found a service manual (chassis PTK195S1B), but it's the hardest schematic I ever tried to figure out.

**PlainBill** · 03-21-2011, 01:37 PM

Re: RCA P52929 Dead

Originally posted by maybenever

I found a service manual (chassis PTK195S1B), but it's the hardest schematic I ever tried to figure out.

I've never worked on a CRT projection this complex, but it's simpler than a plasma TV. I work from the power supply. This should have a main and standby supply. The standby is always on. If it isn't, figure out why. If it is, figure out why the man supply doesn't come up.

PlainBill

**maybenever** · 03-21-2011, 06:20 PM

Re: RCA P52929 Dead

Thanks for the starting point. Are the wires at the other end of this flyback removeable? This chuck of wood and PCBs is sitting in my niece's bedroom. I'ld like to bring those boards home to check em out. If not I'll start checking em there.
Thanks Again

**PlainBill** · 03-21-2011, 09:15 PM

Re: RCA P52929 Dead

Originally posted by maybenever

Thanks for the starting point. Are the wires at the other end of this flyback removeable? This chuck of wood and PCBs is sitting in my niece's bedroom. I'ld like to bring those boards home to check em out. If not I'll start checking em there.
Thanks Again

I'm not sure. Perhaps one of the guys who regularly work on these could help you.

PlainBill

**f67bird** · 03-22-2011, 05:03 AM

Re: RCA P52929 Dead

Yes, they are removable. There are 3 wires that you will need to disconnect that go to the front side of the box. The thick red one is the high voltage lead...it goes into the high voltage splitter. Follow it up to the splitter, pull back the small rubber boot that seals the wire going into the splitter, the lead then pulls straight out...but it sometimes takes a good tug to get it out. I usually use long nose pliers and hold both hands together and give a short tug...carefull not to hit the crt neckboards when pulling the lead towards them.
The smaller wire coming out of the flyback goes to the back side of the focus/screen assembly usually mounted in the front of the box, that one should come out easily. It has a larger rubber boot around it that you should try to pull back first.
Then there is a white ground wire that goes to the grounding terminal block near the high voltage splitter. Follow it to the front and remove it from the grounding block, it will most likely have a small tab that you will have to press in order to get it to release.
I would also take a few photos of the other connectors that go over to the other board before removing them.

**kc8adu** · 03-22-2011, 06:41 AM

Re: RCA P52929 Dead

just pull the whole lightbox assy.the complete works just slides out.
btw the last 195 box i saw that acted like that had a crt coolant leak.

**maybenever** · 03-22-2011, 07:22 AM

Re: RCA P52929 Dead

Thank all for the info. I didn't see any leakage signs anywhere. After I got all the dust bunnies out, it looked OK. It'll be the weekend before I can do somemore checking.

**maybenever** · 03-28-2011, 08:34 AM

Re: RCA P52929 Dead

Well, between NCAA games, I got back into this TV this weekend. (Sorry about your AZ Wildcats PlainBill ) I've decided it's too compex for me. I couldn't get the plasic tray off the bottom of the PCB to do some voltage checking. It's a really bad spot to work, If she can get some help, she'll bring the thing to my shop. It's 12 years old, probably not whort the cost of repair parts. Thanks for all the input.

**Wizard** · 03-28-2011, 09:14 AM

Re: RCA P52929 Dead

This was our butter and bread chassis. Channels and TV acting weird and I do see smoker's gunk is surefire bad tact buttons. Go straight to the front end. Pull the speaker grille by the edges all around, just firm pull. Then undo the screws for the buttons, then replace the tact switches (all of them). Try again and see if this fixes the problem. Very common especially with smokers.

There is very little to go wrong with chassis but I want you to leave these boards alone and fix the front buttons first. Spraying it with cleaner will not fix.

Cheers, Wizard

**PlainBill** · 03-28-2011, 12:28 PM

Re: RCA P52929 Dead

Originally posted by maybenever

Well, between NCAA games, I got back into this TV this weekend. (Sorry about your AZ Wildcats PlainBill ) I've decided it's too compex for me. I couldn't get the plasic tray off the bottom of the PCB to do some voltage checking. It's a really bad spot to work, If she can get some help, she'll bring the thing to my shop. It's 12 years old, probably not whort the cost of repair parts. Thanks for all the input.

Not my team. Unfortunately, the Gophers didn't come close to doing well enough in the regular season to get considered for an invite. But pro Baseball starts this week and I can look forward to the Twins making a statement.

PlainBill

**f67bird** · 03-28-2011, 08:45 PM

Re: RCA P52929 Dead

I am not disagreeing with anyone, but I know you may not have a bunch of the correct type of new switches on hand.
You can see if the switches are causing your problem first if you want to by unplugging the large wire connector on the top of the box (where the three lenses are)
If you unplug that the front switches will no longer be connected, but you can still operate the set with the remote control. If the set still acts up, its not the switches causing this.
Once you get the set going, it's a good idea to replace the switches though...they can cause this and other strange things.

**maybenever** · 03-29-2011, 07:08 AM

Re: RCA P52929 Dead

Thanks f67bird, that sounds doable. I'll give it another go, There are two smokers in the house.

RCA P52929 Dead

RCA P52929 Dead

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