Unwanted freeze frame during play back of DVD by Philips DVD-625 and various other - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd February 2012, 10:49 AM   #1
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Default Unwanted freeze frame during play back of DVD by Philips DVD-625 and various other

Unwanted alternating between moving images (normal function) and freeze frame (still image) by DVD625 - image about
http://srvimg08.aprod.hu/images_apro...esfehervar.jpg

By certain DVD's I observe sometimes an unwanted freeze frame and demolition of sound for 1-3 sec. After this "Play" function starts again and is normal for two until three minutes. Then occurs a new interrupt repeat with freeze frame on the screen.
This effect is only to observe by various DVD's, not by all. This effect occurs both at burned DVDs and pressed DVDs.
OTOH - by several but not all other models/brands this effect is to observe.
In the troubleshooting flow chart of this model this effect isn't mentioned.

How I can narrow the cause ?
Thank you for your advices.

Service Manual of this model you will find here for download:
Philips DVD 625 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics
Download the Philips DVD-625 service manual for free - Hifi Manuals

Last edited by tiefbassuebertr; 2nd February 2012 at 10:52 AM.
  Reply With Quote
Old 3rd February 2012, 09:18 AM   #2
diyAudio Member
 
Join Date: Dec 2003
Location: Sydney
It appears that DVD / CD mechanism has local RF amplifier (as part of the mechanism). The signal you want to check for pp value is labelled TP15, i.e. it is pin 96 on MT1336E.

Look for close to 4V pp RF signal here. Try different DVD or CD discs – each disc has different reflectivity. You have to make sure that with low reflectivity discs, this pp valu is at least around 3.5 V pp. If it is lower than that, adjust the lens output by turning the miniature trimpot located on the lens pick-up clockwise “just a bit”. Recheck with CRO and do not go above 4.2V pp with high reflectivity discs. Vcc is 5 volts, so 4.2V pp value should be ok. I am not familiar with MT1336E. Try to find its datasheet for exact maximum RF value at pin 96. (it could be even 4.5 V pp…)

Cheap mechanisms come pre-adjusted for “correct” lens output, but due to change in lens-to-disc geometry and “aging” this pre-set value drops after a year or so. Re-adjusting this lens output helps in 90% of the cases.

Boky
  Reply With Quote
Old 3rd February 2012, 10:32 AM   #3
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
thank you for this advices. I will check this next time.
Is it usual, that such effects by dvd player, which I have described, occurs when the rf level is too low (unlike cd player) ?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need to play dvd movies on ipod!!! iyask Everything Else 3 29th April 2008 10:54 PM
Handling my DVD-rom play/stop/pauseÖ Progg70 Digital Source 1 10th September 2006 02:31 AM
DVD players in Canada play PAL discs? rabbitz Everything Else 2 31st January 2005 01:48 PM
Samsung DVD-HD840:DVD-A, SACD,P/scan DVD+DVI: Prime candidate for mods KBK Digital Source 7 20th January 2005 03:32 AM


New To Site? Need Help?

All times are GMT. The time now is 05:24 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2