Home > Power Supply > Lcd Power Supply Repair Tips

Lcd Power Supply Repair Tips

Contents

Good luck!Well I took the ol' monitor apart and not a single thing looked bad on the inside. If there is a bridge rectifier or multiple rectifier diodes between the input and any DC loads, it is probably designed to operate on AC. Dried up electrolytic capacitors will result in excessive ripple leading to hum or reduced headroom in audio outputs and possible regulation problems as well. Hope your able to help Tell me if you need any more information about my system i'd be more than glad to post about it. his comment is here

Some simple tests of no load voltage and polarity can quickly identify a suitable adapter as long as their current rating is known (from the label). Stand up for the right to repair in Massachusetts. Most common issues that I found, are power supply issues, with capacitor failure being the number one issue. If the link doesn't work, find the document of the same name at the Sci.Electronics.Repair FAQ or one of its mirror sites.

Lcd Power Supply Repair Tips

Here is a sample circuit using the LM317: I +-------+ O Vin (+) o-----+---| LM317 |---+--------------+-----o Vout (+) | +-------+ | | | | A / | | | \ R1 Always remember that any LCD monitor in general has all the same parts. Answer this question Flag as... The design of the device may assume that this voltage is never exceeded and include no internal regulator.

All Rights Reserved Tom's Hardware Guide ™ Ad choices Notes on the Troubleshooting and Repair of AC Adapters, Power Supplies, and Battery Packs - and - Other Related Information Version 1.19 If the fuse blew but resistance is reasonable, try a new fuse of the proper ratings. Small switching power supply. Lcd Monitor Power Supply Circuit Diagram If ripple is excessive - as a guideline if it is more than 10 to 20% of the DC level - then substitute or jumper across with a good capacitor of

Where a fuse is found to be blown, use only an exact replacement. The LED brightness can provide a rough indication of the output voltage. Getting Inside an AC Adapter Manufacturers come up with all sorts of creative ways of making access a Mer information om hur du kör det inbyggda diagnostikprogrammet på datorn finns i artikeln i Dells kunskapsbank Resolve Hardware Issues Using ePSA or PSA Diagnostics and Guide to Error Codes (Lösa http://www.dell.com/support/Article/SLN209465/EN Also see the section: Comments on Importance of Thermal Fuses and Protectors.

And be prepared that it may spark on contact but with a 1K resistance the current will be relatively small.
More CommentsAbout This Instructable 108,921views14favoritesLicense:mbuddeFollow6More by mbudde:Add instructable to: Contest GroupRelatedHow How To Tell If Tv Power Supply Is Bad Can I use the AC Adapter for my Dell notebook overseas? 9. You can get a fancy LCD tester from here http://www.lcdparts.net/LST.aspx or check on ebay for some cheaper ones. The best way would be to find the information without serious testing.

Lcd Tv Power Supply Troubleshooting

A high quality transformer (e.g. https://www.repairfaq.org/sam/aapsfaq.htm Whether you will get a decently smooth output will depend on how much filtering you have AND on the peak current available from the transformer to recharge the filter capacitors on Lcd Power Supply Repair Tips While many wall adapter output DC, some - modems and some phone answering machines, for example - are just transformers and output low voltage AC. How To Repair Lcd Monitor Power Supply For example, a couple of pieces of wooden dowel rod about 2-1/4" long taped together with wood screws in the appropriate ends would substitute for a pair of side-by-side AA batteries.

You have your power supply, most of those having the inverter circuitry on the same board, your video board, your LCD panel and your button bars. this content The problem was the same in all of them, so I'm guessing it is a pretty common problem for these monitors. The lifetime of an AC adapter (particularly those outputting DC) when run at or near its nameplate rating may be very short. General AC Adapter Information AC Adapter Basics It seems that the world now revolves around AC Adapters or 'Wall Warts' as they tend to be called. Tv Power Supply Symptoms

can u give me url from amazon to buy a blacklight tester and the other things you suggest. Sverige Välj land Afghanistan Albanien Algeriet Amerikanska Jungfruöarna Angola Anguilla Antigua och Barbuda Argentina Armenien Aruba Asien/Stillahavsområdet Australien Azerbajdzjan Bahamas Bahrain Bangladesh Barbados Belgien Belize Benin Bermuda Bhutan Bolivia Bosnien och So I guess this is a ghost post! :>)

Thanks for this instructable. http://servergeek.net/power-supply/check-if-power-supply-is-enough.html I wonder how many people have ignored the warnings when their equipment stopped working and replaced that fat "plug"?

Note that in this document, non-switchmode types are discussed. Lcd Monitor Power Supply Board Buy Online There were resistors between pins in the tips and I would assume as you did that this "told" the power supply what output to give on what pins. Preview my answer Post my answer View Statistics: Past 24 Hours: 0 Past 7 Days: 16 Past 30 Days: 51 All Time: 2,567 24,867 Free Manuals 93,516 Solutions 7,181 Devices iFixit

Note that even some identically marked adapters put out widely different open circuit voltages.

This is usually reverse biased across the input and is supposed to short out the adapter if the polarity is reversed. If there is nothing between it and the power jack, then polarity will be that of the cap and you will have an upper bound on voltage (but the actual safe It may be readily available: Examine the device for labels, either embossed near the power jack or on the rear or underneath such as: DC 5V ---- AC 12 V ~ Lcd Monitor No Power There are exceptions.

Du kan kontrollera om batterigarantin fortfarande gäller i följande artikel i Dells kunskapsbank, Notebook Battery Warranty Support (support för den bärbara datorns batterigaranti). Insulate completely with several layers of electrical tape. This could be disastrous where a piece of equipment is plugged into it that doesn't expect such a high voltage. http://servergeek.net/power-supply/power-supply-calculators.html The other major consideration is current.

Note that increasing the uF value of the output capacitor (C2) will generally not have much effect, but probably won't hurt. About AC Adapter Ratings The following mainly applies to AC adapters using transformers.