I have a Toshiba 36HF72 that when turned on for about the first 5 minutes has a horizontal flashing/jumping/jittering that "tiles" or scrambles the picture. After it warms up the picture has slight vertical (up & down not side to side) wavy lines throughout the picture but mainly noticable at the top. The picture continues to flash every once in awhile (especially when the vcr is playing). The horizontal & verticle deflection sections have been resoldered as well as the power supply section. Freeze spray has no effect on the board after warm up. Tapping, shaking, or flexing the board has no effect nor does probing with a plastic stick. The problem seems to be gradually getting worse. Any suggestions would be greatly appreciated, Thanks :-)
How are you able to get underneath the main board so that you can detach the main part of the silver "box" from the board so that you can unplug the module? this is where i'm stuck. also, the solution lists number cx241 twice but counts it toward the total of 11 caps to replace, can anyone confirm this?
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1) you have problem with the Raster 2) the main causes are a) raster b) picture c) sound d) synch 3) since this are not video, the problem is raster. your must test the voltage from section horizontal out +125vdc+vertical output +80v+all other circuit +12vdc 4) test the power supply for defective. see the diagram attached
Sounds like a problem in the deflection circuits either vertical or horizontal. You may also want to check the solder connections in the tuner as they have been known to develop cracks over time. But the prior shrinking tends to say deflection problems.If I can assist you further please let me know.
There is a module called a hyper board that is vertically mounted near the jack panel. Inside the module are 10mf/25v capacitors they are grtting weak. The module is fully shielded and pluggs into a socket. the module has 4 tabs (2 on each end) that must be unsoldered before it can be unplugged. This repair should be done by a qualified technician. The caps are surface mounts and very small. Unless you have excellent soldering skills and a rock steady hand DO NOT ATTEMPT to repair this problem on your own.
First of all, there is no such thing as a "high power flyback converter". There is a flyback transformer, but if it was bad you would have absolutely no picture at all. The fact that you dont even know what the basic components are suggests that you should not be "diving in" to someone else's TV. Do everyone a favor and allow an experienced tech to service the set.
I gather from your post that wavy can mean two possible things as the TV comes on, you see the picture flow like ocean waves? In this case you may have 60Hz hum modulating with the picture, this is actually unlikely these days, but I have heard it happens sometimes.
The other thing it could be is light horizontal tearing. This happens when the horizontal frequency is too high or too low. You are not going to like my solution because I feel that for problems like this the set must be analyzed not just subjected to "shotgun troubleshooting", so here I go, Take the TV to a repair shop.
take it to a tech if you have not done so. your problem is lose solder.your board needs to be rsoldered over to connect your component properly over the years heat from the operation of the tv cause the soldr to lose grip on the board.good luck