JP1 Remotes Forum Index JP1 Remotes


FAQFAQ SearchSearch 7 days of topics7 Days MemberlistMemberlist UsergroupsUsergroups RegisterRegister
ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

DVD Repair

 
Post new topic   Reply to topic    JP1 Remotes Forum Index -> Electronics Repair
View previous topic :: View next topic  
Author Message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Tue Nov 25, 2008 11:52 am    Post subject: DVD Repair Reply with quote

I just found a site that repairs many different models of cheap DVD players, with very reasonable prices. Staying true to the "you get what you pay for" theory, many of today's cheap Chinese DVD players will fail for various reasons after not too long (I've experienced this myself with the Raite AV715). So this site gives advice on how you can fix things yourself or send the broken parts into them for repair. It also advises on some things you can do to prevent known problems from occurring.

http://drx9000repair.netfirms.com/

If you use this site, please post back about your experiences (good or bad).
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
underquark
Expert


Joined: 20 Jun 2005
Posts: 869
Location: UK

PostPosted: Wed Nov 26, 2008 6:23 am    Post subject: Reply with quote

I'm finding (in the UK at least) that the DVD players are sometimes cheaper than the DVD's. When when one does fail you can steal the PSU from it and transplant it into the even poorer-quality Bush LCD TV that you got for a "bargain" off eBay (unless, of course, it's the DVD's PSU that has failed).

"Buy cheap, pay twice" as they say.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Wed Nov 26, 2008 8:51 am    Post subject: Reply with quote

It does seem like all the cheap players have problems, which is not surprising given the price, but the cheap players are usually capable of doing a lot more than the regular brand players (at least in the US).

It's a lot less likely that a Sony, Toshiba, Panasonic, etc brand player can be hacked to player DVDs from any region and you can't just assume that you can play VCDs or MP3s or karaoke discs on them, whereas most cheap players can handle all of those discs, just as long as the player keeps working! Smile So, if you know how to fix things, it might be worth it to get a cheap player.

Me personally, I have a Raite AV715 sitting on top of a Pioneer DV525, one for the foreign discs and one for US discs!
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
zaphod7501



Joined: 02 Aug 2004
Posts: 524
Location: Peoria Illinois

PostPosted: Wed Nov 26, 2008 7:25 pm    Post subject: Reply with quote

The capacitor failures are found on a lot of products. I just fixed a 42" LCD with several bad filter caps. (causing digital corruption after warmup) Many of the bad caps will bulge at the end and give a visible clue also. My friend's Polaroid DVD Recorder needed several replaced when it started acting flaky.

The highly regarded Oppo DVD player almost came with a warning to replace several filter caps before you even bothered to use it.

I personally suspect that the attempt to make the newer components eco-friendly (biodegradable) has also made them unreliable and very short lived.
_________________
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Wed Nov 26, 2008 8:54 pm    Post subject: Reply with quote

What do you think is causing the problems, is it bad caps, or are the caps failing because of other problems in the units?
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
zaphod7501



Joined: 02 Aug 2004
Posts: 524
Location: Peoria Illinois

PostPosted: Thu Nov 27, 2008 9:53 am    Post subject: Reply with quote

It's the caps.
When there are failures, they are almost always of the same value and from the same manufacturer. That's what makes the sets repairable. You change all of the similar caps, regardless of their condition, and it fixes a large percentage of the units. You could never actually troubleshoot the circuits and find the bad ones.

The problem is aggravated by the design of using the lowest voltage rating possible. ie a 10 volt cap in a circuit running at 7-10 volts. (no headroom) The normal repair process will use a voltage rating at least one step above the original. The actuality is that the part is capable as long as it is in perfect condition. As the cap ages, the ripple that starts to rise starts to exceed the voltage rating. In a TV the vertical power supply (and CRT drive) is fed from a pulse that is about 350 volts, peak to peak. The cap is usually rated at 250 volts DC. As long as the cap is good, the DC is only about 200 volts DC, with no ripple. As it ages the DC drops slightly (not enough to notice) but the P-P voltage rises above the rating of the cap causing it to fail very quickly
_________________
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Thu Nov 27, 2008 10:03 am    Post subject: Reply with quote

It's interesting to me that so many of these cheap DVD players can be fixed by a slight alteration to the circuit (ie, not just replacing some bad caps). For example, look at the fix for the Raite AV715 in the site above where he replaces a zener diode with a cap and a voltage regulator.

I know these are cheap players, but with just a little bit more care and attention, plus better quality parts, these players would have a lot less problems.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
zaphod7501



Joined: 02 Aug 2004
Posts: 524
Location: Peoria Illinois

PostPosted: Fri Nov 28, 2008 12:10 am    Post subject: Reply with quote

My theory on these cheap players (I picked up a Cyberhome for multiregion) is that they are designed for a world market. One product for all locations with simple changes to modify them for the intended sales market, hence the easy region hacks.

Since the rest of the world (outside of the USA) seems to pay full price for products, they wouldn't accept the cr*p we buy here that was built especially for our discount market. In other words, world intended products are better built than USA intended products.

I think many of the chronic problems are caused by eco-friendly requirements that were instigated by people that had no technical knowledge; or they ignored the expert's advice.

At least that's my jaundiced view of consumer electronics manufacturing and marketing.
_________________
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Fri Nov 28, 2008 10:49 am    Post subject: Reply with quote

Maybe you should check to see what mods he recommends for your Cyberhome as maybe a little preventative medicine will help keep it running for a long time.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
mr_d_p_gumby
Expert


Joined: 03 Aug 2003
Posts: 1370
Location: Newbury Park, CA

PostPosted: Fri Nov 28, 2008 1:08 pm    Post subject: Reply with quote

zaphod7501 wrote:
I think many of the chronic problems are caused by eco-friendly requirements that were instigated by people that had no technical knowledge; or they ignored the expert's advice.
At least that's my jaundiced view of consumer electronics manufacturing and marketing.
My view from the design-side of the fence is similar. In order to sell your products in a world market these days all components need to be RoHS compliant, and this has affected the entire electronics industry. Even the solder has to be lead-free.

The other issue regarding the electrolytic caps is that most engineers don't focus on the design of the power supply, i.e., they treat it as sort of a necessary evil. As a result, you often see the wrong type of capacitors used (too much ESR; too little ripple current ratings, etc.), and they compound it by making sure they run at a high temperature by placing them right against a heatsink, further shortening their lifetime.
_________________
Mike England
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Fri Nov 28, 2008 1:28 pm    Post subject: Reply with quote

This is one of the reasons why I love the internet as it brings together regular folk with the experts. I don't know anything about electronics, but I was able to fix my DVD player using info that I found on the net, and I'm sure that many others will fix theirs using the info on sites like the drx9000repair site.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
underquark
Expert


Joined: 20 Jun 2005
Posts: 869
Location: UK

PostPosted: Sat Nov 29, 2008 5:44 am    Post subject: Reply with quote

I have a PVR - Topfield TF5800 (actually, three, and no problems luckily). It has a complex PSU and cap's failure is #1 hardware issue.

Link
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 17750
Location: Chicago, IL

PostPosted: Sat Nov 29, 2008 12:05 pm    Post subject: Reply with quote

From the first page in your link, it sounds like replacing some of the caps with better quality caps will fix potential problems. So, are you going to give it a try?
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
HamburgerHelper1



Joined: 22 Feb 2014
Posts: 22

PostPosted: Wed Apr 12, 2017 6:18 am    Post subject: DVD Repair Reply with quote

Yes bad caps are a problem but I am seeing fewer cases of that in newer products
The problems vary immensely but a close second to bad Caps is poor solder joints.
The switch to Eco-friendly Silver solder instead of Lead solder has become another serious problem. Silver solder so far is not he answer to get rid of lead in our products
so more research needs to be done to find alternatives to lead based solder
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic       JP1 Remotes Forum Index -> Electronics Repair All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


 

Powered by phpBB © 2001, 2005 phpBB Group
Get Smart! the band's official homepage Rockabilly Central