Mitsubishi cs-2710ra vertical problem
in [Repair]
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From: ladybug on 21 Aug 2006 19:43 I replaced 5 leaky caps that I found but it didn't change anything. I suspect that vertical output IC went kaput. After all it died suddenly without gradual picture srinking. Is it LA7838 chip? Is there a way to test it with multimeter? What is a good place to get a replacement?
From: Leonard Caillouet on 22 Aug 2006 10:04 "ladybug" <natayz(a)gmail.com> wrote in message news:1156203799.618445.25940(a)h48g2000cwc.googlegroups.com... >I replaced 5 leaky caps that I found but it didn't change anything. I > suspect that vertical output IC went kaput. After all it died suddenly > without gradual picture srinking. Is it LA7838 chip? Is there a way to > test it with multimeter? What is a good place to get a replacement? If you want serious help, post some specifics. You probably did not get all of the caps that are bad. There will be at least a dozen. Do you have both the 12v and 28v supplies at the output IC? Which caps did you change? Leonard -------------------------------------------------------------------------------- I am using the free version of SPAMfighter for private users. It has removed 4181 spam emails to date. Paying users do not have this message in their emails. Try SPAMfighter for free now!
From: ladybug on 22 Aug 2006 17:01 Leonard Caillouet wrote: > If you want serious help, post some specifics. You probably did not get all > of the caps that are bad. There will be at least a dozen. Do you have both > the 12v and 28v supplies at the output IC? Which caps did you change? > > Leonard I replaced C458, C450, C460 all 100uf. Also C559 and 2G1. I defenately missed some.... On the IC I have 12v on pin one but no 28v. Is it supposed to be on pin 8? Nothing there.
From: Tech Data on 22 Aug 2006 17:12 ladybug wrote: > Leonard Caillouet wrote: > > > If you want serious help, post some specifics. You probably did not get all > > of the caps that are bad. There will be at least a dozen. Do you have both > > the 12v and 28v supplies at the output IC? Which caps did you change? > > > > Leonard > > > I replaced C458, C450, C460 all 100uf. Also C559 and 2G1. I defenately > missed some.... On the IC I have 12v on pin one but no 28v. Is it > supposed to be on pin 8? Nothing there. Then you need to backtrack to the flyback. You have an open current limiter, probably a 1.2 ohm 1/2 watt. And yes, if it's an LA7838 pin 8 is your primary VCC and should be 28 volts or so. www.techdata-kicksass.net
From: ladybug on 22 Aug 2006 17:19
Also trace from c458 to pin 9 was corroded and read open. I got that taken care off. |