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IC fault. Replace the TDA9381. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.
If you're sound in electronics, and wish to get more details,
check this link.http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Time slide, can be selected by the drop-down list, at the top left
of the display window, will make surf easy. You can also do a search, by type in the brand name/model
number/IC used, in the search box at the top right of the display window.
Check the video output RGB out terminals of the TDA9370. Check the voltages. If can, check signal waveform. You have't specified nothing about the audio status. If you wish to get the schematic of TVs, using TDA9370, check the site linked here. Never confirm that the IC is OK. Check the serial data & serial clock. Replace the main system control memory IC, too. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by type
in the model name to your set in its search box, or view it in Mosaic
You did not give a model number. If this is an older model Sony, I would be concerned with the audio IC with standby. This IC will be of the TDA-XXXX series. I doubt if you have a problem with power supply. If you can locate the IC mentioned, and read the TDA number, cross reference this in an NTE semi conductor manual. If it does tell you it is an audio IC with standby...replace this IC with the cross reference. Be sure to check any grounds that need resoldered in the same area as the IC mentioned. Thanks for asking and show a few hands of support!
TDA 8362B IC which have vertical freq.output is at pin no.43. (vert.osc)
for fixing this problem minimise brightness to avoid crt burn.
proceed as follows
1 if you are getting sawtooth at output of ic tda 8362 pin 43 then check
1 supply at vertical output ic from eht.
2 yoke connector loose .
3 check vertical output ic parts.
4 finally vertical ic.
please check for normal output from power supply even though fault gets rectified just for protection.