Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

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Changed the ICs but bad resistor

Can anyone Tell me what resistor goes into spot R850? and where i can order it?

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  • jonze1 Dec 09, 2007

    Bill,

    Thanks for the help, The resistor does look like the one in spot R 846 but with different color bands. I replaced the convergence IC's with STK392-110's and nothing happened then i noticed the blown resistor. I checked the rest of the resistors that is the only one I need to change but I can't get a reading off of it to change it. Should I get a 1.5 ohm 2 watt? and Should I get new IC's and upgrade?? I will order from acme-sales when you write back....Thanks for your help I really appreciate it

    Jonze

  • jonze1 Dec 09, 2007

    Bill,

    Also I am looking on acme-sales and there is no 1.5 ohm 2 watt, What should I get?

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  • 934 Answers

Jonze,
I don't have a schematic here so I'm shooting entirely from memory... the 850 series position tells me you're in the convergence circuit and I would guess you're replacing some of the yoke return resistors.. Are there any color bandings on that resistor? How about compare it to R846 which I know is a yoke return resistor (it's a 1.5 ohm / 2w) and does it look about the same?
Now I'm going to be really pushy - - - the heading here says you changed the ICs and I would assume you're referring to the convergence Ics? Both are a STK392-110 factory, what did you change them to and where did you get them?? Reason I ask is that there are a lot of chineese knock-offs out there and they won't last sometimes past pressing the power button. And usually with these units I upgrade to a higher amp Ic for greater reliability like a STK392-150 or 180... In addition take a dmm or annalog ohm meter and test all the low ohm resistors in that youke return. A resistor doesn't have to look burned to have changed in value...
Where do you get them... Try Acme Enterprises in Florida.. They have quality Sanyo original Ics and prices are cheaper than anywhere else you'll find in the US... http://www.acme-sales.net/index.shtml
Have a great day and good luck on your repair!
Bill

Posted on Dec 09, 2007

  • William Rayburn
    William Rayburn Dec 09, 2007

    Personally I'd get the upgrade Ic's from acme and install them...

    I did also acquire the service manual this evening. R850 is a 2.2 ohm 1w which I would personally upgrade to a 2w... Acme sells those also in a bag of 10 for $1.99 and you might as well check and change out all the 2.2 ohm 1w for the higher 2w... BTW the color banding on that is red-red-gold-gold and you should see serveral others in that area...

    Bill

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Jonze,
Guess I should have looked to see that you had a second post. I justa answered one and here's some of the answers to my questions..
Brown - green - grey - gold would be a 1500m resistor and I would HIGHLY doubt they used something that intolerent in the convergence circuit... It's more likely to be a 1.5 ohm resistor which is brown - green - gold - gold and the grey you're looking at my just be discolored from heat stress...
Take a look at my previous post and tell me what you find after you make some comparisons.
Bill

Dec 09, 2007 | JVC AV-56WP74 56" Rear Projection...

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