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#1
11-21-2007, 11:52 PM
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Advice on (hopefully) simple repair to RCA HDTV
Yep, I've done it again! Second curbside TV in a month.
 This one is a 2004 RCA (Thompson ) 52" HD rear projector. The guy said it quit working about a week ago. I get it home(inquire about sidesplitting story!)and plug it in. The standby LED lights up and the power supply energizes, but the set doesn't turn on. I remove the back panel and find a thoroughly toasted resistor on the back of the mainboard, well away from the PSU. The carnage on the board roasted off most of the part #, but judging by the others on the board, I think it is number R14703. The rest of the board is clean. Pics:http://img210.imageshack.us/img210/5631/1020790nr3.jpg http://img411.imageshack.us/img411/1545/1020791du9.jpg http://img211.imageshack.us/img211/7751/1020792wj4.jpg Also, in the first pic, you can see on the screen what looks like shadowy arches; I don't know if this is a burn or other damage to the screen, or just a reflection. It's only noticeable from some angles under certain lighting. Hoping to get this working to go in our pool room for Super Bowl and gaming. 
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Sony Trinitron Fan 
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#2
11-22-2007, 12:27 AM
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Have you got a model or chassis number. Should be on a piece of paper located on the rear cover. I'm not familiar with RCA's newer bigscreens; but, their direct view sets of this era are known for having bad flyback's. You'll probably have to obtain service information on this set to determine what value the resistor is. Then, you'll have to find out what drew too much current and burned the resistor. You may try tracing the foil on the underside of the board to see what the resistor connects to. You may possibly have some type of solid state device (IC, transistor, diode, etc.) that has shorted. And, it could have very well have been the flyback that went bad. Like I said, they are high failure parts in the direct view sets.
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#3
11-22-2007, 12:36 AM
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The model number is HD52W56, chassis #ATC321. There is no mention of DirectView anywhere on the set. Where would I obtain said service info?
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Sony Trinitron Fan
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#5
11-22-2007, 01:01 AM
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Quote:
 ) Also, like with the last set I was working on, could I replace this resistor without touching anything else? I will remove the board and look at the traces when I get back from Thanksgiving vacation on Saturday. 
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Sony Trinitron Fan
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#6
11-22-2007, 01:23 AM
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I looked on the internet and found that he HV splitter is a very common problem on these sets and can burn some resistors with it. R14705, R14718, & R14719 are said to be the resistor location numbers of the ones that smoke. The HV splitter part number is 258512.
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#7
11-22-2007, 01:39 AM
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Quote:
Still new at this; what is a HV (assuming stands for High Voltage) splitter and what does it look like? Also, where on the chassis is it usually located, and are they expensive/hard to replace? Sorry for all the questions.EDIT: I just perused the PS and mainboard for ten minutes and couldn't find anything with #258512 on it.
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Sony Trinitron Fan
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#8
11-22-2007, 10:03 AM
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The splitter is usually located off the main board. It is a small box with 4 or 5 large wires connected to it. It splits the high voltage from the flyback to each of te 3 projection tubes. They are not usually to hard to replace.
Bill R
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#9
11-22-2007, 11:06 AM
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That RCA part number is usually never on the parts. The only way you can get the RCA part number is to either have the service information or some type of parts cross reference for the set. I just happened to find the part number on the internet. If you replace the splitter, try to stick with an original RCA. It's been my experience that the cheaper generic ones don't hold up that long.
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#10
11-22-2007, 01:10 PM
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Quote:
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Mom (1938 - 2013) - RIP, I miss you Spunky, (1999 - 2016) - RIP, pretty girl! Rascal, (2007 - 2021) RIP, miss you very much
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#12
11-22-2007, 02:01 PM
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ok here are your part numbers. splitter 258512 r14705 238958 which i believe is a 27k ohm 1/4watt carbon r14718 260880 r14719 175046 tritronics has the splitter and resistor in stock. that is where we buy all our rca parts. they are original not generic.
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#13
11-24-2007, 03:41 PM
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Thanks for the help, guys! I'll get on this repair ASAP. Does anyone have a link to the Tritronics site? I Googled it and all I see is dog training sites?
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Sony Trinitron Fan
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#14
11-24-2007, 03:44 PM
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#15
11-25-2007, 03:55 AM
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I did some more snooping and found this component behind the front access panel beneath the speaker grille. Would this be the HV Divider?
http://img402.imageshack.us/img402/7...dividerun0.jpg Looks kinda like a mutated flyback, with each of the three leads going to one of the three RGB CRTs. The fourth lead is coming from the main flyback, I assume? Also, when replacing, do I disconnect the leads at the tubes or the divider? 
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Sony Trinitron Fan
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