I have a JVC TV with IC BT1226EN so i replaced the IC but the new IC didnt display anything yet the old one displays menu but no picture so could you help me with the Ic labling of TB1226EN to see if i can follow the video signal or advise me on what to do its for a client and i have tried but all in vain.
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The high voltage transformer may be the problem, because it feeds back secondary voltages to different parts of the set, for example is the vertical deflection voltage present at the ic, if memory serves me there should be around 26volts, if it's missing it means the fuse is open or the flyback pin is not generating the voltage.
Just make the picture status button on the remote control and get the display setting to its factory mode.
The VIDEO STATUS button gives you a choice of three TV picture display settings, including a
display of your own preferences.
Standard - Resets the picture display to the factory settings.
Dynamic - Heightens contrast.
Theater - Gives a rich, film-like look to video. (AV-27D303, AV-27D203 and AV-20D303 only)
Sports - When you watch a sports program. (AV-27330, AV-27320 and AV-27S33 only) Press the VIDEO STATUS button repetedly to get these choices.
Total black screen is usually as a result of 2 things. The first being either the contrast or brightness being reduced to the lowest point. this makes the screen display to look like it is not showing anything at all. The other being that the picture ic of the unit is blown. In this case you need to refer the unit to an expert to trace the particular ic order a replacement for it and replace it. Hope this solution has been helpful?
The vertical IC is faulty and needs to be replaced. Look for a small flat IC attached to a heat sink. It will be marked LA7837 or something similar. Replace that part and update this with your results. That may resolve the problem or at least get you a distorted picture which will indicate a few other parts that need to be replaced.
have JVC AV-32F702 TV. It's picture color is very red. unable to adjust colors through menu. Channel numbers are also in red now instead of normal green. any suggestion?
please check red color cathode circuit
1 check red output from ic to red cathode ckt
2 check voltage on r output ckt& ic or tr.
3 check loose contact in red cathode ckt
4 check crt base for loose.
5 loose connector
6 chroma ic
You need to adjust the vertical height in the Service menu.Press the SLEEP TIMER key and set the SLEEP TIMER for
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
Returns to the previous screen.
Yes it could be the microprocessor IC or the display IC. Im not sure how the display system works as I do not have a schematic for the set. now what I have seen in the past, is that when the flyback blew out it sent a spike pulse way bigger then it should have been and blew out the display sync circuit, and that is built into the microprocessor. Also I have seen in the past, when a main componet such as a flyback transformer is replaced, there are small surface mounted componets near and around the flyback that gets unsoldered. These are ussually small surface mounted type resistors or capacitors that send a pulse to sync up the display output with the horizontal and vertical sweep, or the display would not know where to be and would run so fast along the screen that you would not see it. Check out the horizontal pulses to the micro, or like I said the micro is bad. Good Luck