Jvc tv hi need to adjust vertical size. how to enter service mode?

If you wish to get some details; check the site linked here. Pull up older posts.
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Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
NB: Please read and understand well, the instructions to enter the service mode, before you begin. Be very careful. Note how to "EXIT" the service mode; after entering and adjusting data. This is very important.
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To do this adjustment, you should enter the service mode option. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given.

If the problem is with its picture linearity [Vertical], you have to enter its service mode to correct it. It is best to replace all the electrolytic capacitors [5 or 6] of it, at the vertical scan output circuit, before doing any adjustments, because, if there is any of it is damaged, the fault to this kind can occur too. After replacing it, just switch ON the set, and check the picture linearity is correct. If not, enter its service mode, and adjust the vertical picture linearity. If you wish to get some details, check the site linked here.Pull up older posts.

Zenith sets, like most others now, are adjusted electronically through a service menu. You'll need your original remote control (or a Zenith-brand universal replacement with a MENU key) to access the menu. Press and hold the MENU button until the channel number and time display goes away, then press 9, 8 , 7, 6, ENTER. This puts you into service mode.

In service mode, CHANNEL UP and CHANNEL DOWN move through the different settings, and VOLUME UP and VOLUME DOWN change the values. Make sure you write down the original value of anything before you change it so you can put it back if necessary. One of the reasons the manufacturers hide the service menu is because the set can be damaged by incorrect settings to some of the parameters.

On some models, you can't get to all the parameters unless you change one called F MODE from 00 to 01. You might need to do this on yours.

The list of parameters varies by model and features. I haven't worked on a Zenith in a long time so I don't remember exactly what yours says, but you want to find two settings for V SIZE (vertical size) and V POS (vertical position). Adjust the size first by lowering the value until the top and bottom of the screen are black. Then adjust the position so the picture is centered (black strips close to equal size). Finally, increase the size until the picture fills the screen again. It's normal to adjust for a little overscan, meaning you push the top and bottom a little bit out of view. If you stop too soon, on some channels you might see flashing lines at the top of the picture.

When you're finished adjusting, turn the TV off to exit service mode. If you needed to change the F MODE setting, put it back to 00 first. Your picture should be properly sized after all this.

vertical height problem is in vertical IC side check the capacitor around it or re solder the section.

You need to adjust "vertical height" in the service program. You need to put the set in "service mode" to do this adjustment. If you google "enter service mode RCA F32665" you should find the procedure. It will be listed in abbreviated letters such as VERT SIZE or VERT HT. Follow the instructions for entering service mode and saving the data closely!! The data you change will be listed as a number between 1 and 63. The number will only need to reduced by a small amount and you can still see the picture behind the data and watch it shrink as you adjust the number down.Always burn the new number to memory (if required) before exiting service mode. Good luck

barneyluc

Hello! You need to put your tv into service mode and adjust the horizontal and vertical size. You can find info on how to enter the service mode for some brands at epanorama.net. Good luck.

barneyluc

Sure. I'm not sure if you can do it without the original remote, though. On my remote, you need to have the tv turned on, then press the sleep timer, then press the display and video status buttons simultaneously. This enters the service mode. Then, you should see an option for self-check (#2 i think). Enter that, then you should see 2 vertical columns of different inputs. From that screen, power the tv off. This resets all the ports on the tv.

You need to adjust the vertical height in the Service menu.Press the SLEEP TIMER key and set the SLEEP TIMER for ｢0 MIN｣. Then press the DISPLAY key and VIDEO STATUS key of the remote control unit at the same time to enter the Service menu.In SERVICE MENU, press the FUNCTION ▼/▲ key to select any of the SUB MENU items. (The letters of the selected items are displayed in yellow.)You want #2 DEF - go to sub-menu and look for the height adj. FUNCTION / key Setting (adjust) the SETTING VALUE of the SETTING ITEM. When the key is released the SETTING VALUE will be stored (memorized). EXIT key Returns to the previous screen.

to get into the service menu using the remote turn the volume down with the button on the front of the tv ( do not release). Whilst holdind tv vol- button press the button on the remote with a circle and three text lines for a few secs. This should let you enter the mode.