On 23/6/03 4:28 pm, "iMac List" <[EMAIL PROTECTED]> wrote: > From: "Ben Smith" <[EMAIL PROTECTED]> > Subject: Re: Screen image scrunching to mid-screen vertically > Date: Mon, 23 Jun 2003 16:25:43 +0100 > Message-ID: <[EMAIL PROTECTED]> > In-Reply-To: <[EMAIL PROTECTED]> > > <SNIP> >> You're losing horizontal deflection. This is caused by one of two >> things: the failure of the horizontal output transistor that drives that >> part of the deflection, or a blown capacitor in the circuit somewhere. >> Deflection is loosely described as the "stretching" of the picture. If >> the HOT were to completely fail, you'd see a line running down the >> center of your monitor, from north to south. Conversely, vertical >> deflection failure has the same effect, and would show a line from left >> to right. However, vertical deflection is controlled by completely >> different means. >> >> You'll have to take it in to a TV repair shop to get it fixed.I'm >> willing to bet that once the cover is taken off, a capacitor will >> probably tumble out. Or you'll find one that has blown it's oily >> contents all over the inside of the case, and is swollen. >> >> The repair,depending on if it's a cap or the H.O.T., will probably be >> $100+. You'll have to decide if it's worth it to you. The price of the >> transistor alone is $15-$30; the capacitor (which is computer grade), >> around $13-$20. > </SNIP> > > That sounds a tad OTT on the component prices, I had a monitor to repair a > few months ago, the Horizontal Output Transistor (HOT) was in the region of > �3 UK (about $5 US) and I replaced most of the caps at the same time with > low ESR 105-degree types, none of the caps came to more than �2 UK ($3 us) > each. > however I do not know of any repair shop that will do a repair like this (or > anything else!) without ripping you off. > Ben.
I'd agree with Ben over pricing, $15 to $30 for a typical small HOT is very excessive. Around �3 - �5 is typical, depending upon the part. Grandata in the UK is very competitive. Many TV shops won't touch iMacs simply because they don't know how to pull them apart, and AASP's will want to swap out the P/A/V board rather than attempt a component level repair. 'High prices' charged for repairs often relate to the labour charges relevant to running a business and its expenses. The company I work for charges �40 to evaluate a product and then �60 per hour + parts + VAT (tax @ 17.5%). This can make most lower value products uneconomic to repair. If I repair an iMac or a monitor privately with most I only charge �30 + parts, and if small monitors include a certain amount of low cost items. But then I don't have the overheads. Getting down to the original posters query, I have seen quite a few slot loading iMacs with this problem caused by dry joints in the horizontal deflection area. I would then resolder all of this area, even if the solder joints look good. I've never had a HOT fail yet on a slot loading iMac. Capacitors, yes, but not in the deflection area. Many in the PSU secondary section go high ESR, often from a fraction of an ohm to 11 at worst. These have caused intermittent start up and no screen image unless the G2 is advanced, due to low heater volts amongst many. The original poster will have to weigh up the options re repair, and try to get some ball park costings. Any competent repairer will have seen these problems before and should be able to give some idea of costs before accepting the repair. Steve Bell -- The iMac List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | - Epson Stylus Color 580 Printers - new at $69 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> iMac List info: <http://lowendmac.com/imac/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/imac-list%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
