Hi I am having a LG VCR GC980W 6 heads HiFi model. There is a bad picture and sound in some cassetes while playing while in another video the same cassetes works fine. I wonder whether it can be belt problem. 1. Are there rubber belts in thsi model. 2. Where can I buy them?

Dirty tape heads and transport path.

a common problem is rental videos that have been damaged in the first few feet of the tape by some other vcr's defective drive mechanism that "eats"the tape..What happens is the particles of the damaged tape clog the video heads in your machine,which have gaps in the millionths of an inch.Put a brand new tape in the machine and let it play for a half hour or so and it will usually clear itself.If that does not do it,insert a head clening tape and a couple drops of cleaning fluid and run it through.The newer machines will show a blue screen if there is no video information present.However,if you put it on forward search,it overrides that feature and you will see a snowy picture from a good tape,if one video head is clogged and the other is working.There are 2 video heads on a rotating head.it spins at 1800rpm and that is the whirring sound you hear when play is pressed.If both heads are clogged,you will see a snowy screen and no picture at all.A 4 head machine has 2 heads for slp or 2 hour speed and the other 2 heads are used for lp and slp.A hifi vcr has 2 more heads,which are used for the hifi audio,a total of 6 heads.The stationary playback head has a control signal for tape speed,and regular audio,mono or stereo.

Hello,
Just a hunch. Look for a cleaning casset and use it to clean the heads.
Hope it helps.

If it plays it fine afterwords, - it's normal.

Is this a HiFi stereo vcr? When you cleaned the heads, did you only do the heads on the rotating cylinder or only the fixed tracking/audio heads between the cylinder and the pich roller?

Does a prerecorded tape ( not a self recorded from that machine play ok?

HiFi vcrs default to the audio head(s) on the tracking/audio head if the HiFi heads on the rotating cylinder are dirty or damaged.

If a prerecorded tap palys fine, then the erase head circuit has failed.

If sound is weak and warbles, worse on SLP than SP, a weak VCR power supply.

You have a bad take-up reel clutch or a belt that is slipping.

What do you mean by "not able to play my VCR with some cassettes. " Is it that some tapes do not display images? No Video? From your name it seems that you are from India, Assuming that to be so, I also presume that you must be possesing a Multi-System VCR, to play back PAL Tapes from India, and NTSC tapes from the US. And if that is the case, I guess it is a simple problem of resetting the System standards. Please go to the Main menu of your VCR using the Remote, and select AUTO in System (You will be given choices of AUTO, PAL, NTSC 3.58, NTSC 4.43 and NTSC PB PAL. Likewise, it is entirely possible that your Television SYSTEm Standard has been accidentally changed. If it is Multi System TV, Then, again, using the Remote of the TV, select Menu, and then select AUTO in System. In all likelihood your problem should get solved.

Screen will be blue. It Is known as video mute What happens when you play a cassette now? If you are still getting sound, and no picture, then the video heads are dirty. Get a good Wet Type Cleaning cassete and clean the Video heads. Do 2-3 runs of the tape, and check if picture is now visible.

Does it play back professionally prerecorded tapes okay? Does that VCR have a HiFi stereo option? What is the brand name and model number of the unit?

Are these prerecorded tapes or ones that you recently recorded? Or are they all normal audio tapes?? Try a pre recored and turn off the HI fi audio and thats an easy thing to do as put it in normal and mono.. Get back to us so we can assit. Not enough info as could be 100 things.