I change the LA7841 out vertical, the tv was closed vertical. Now open the vertical but not have video neither audio. The screen to be color green with lines of erase. I need help, what can tobe.
Thanks
Jose
Check for shorts in crt have had a lot of these in the shop and its usaally like dude said bad soder joins but i have also had a fe 31's with bad crt some times can be burned out but not always its caused useally by means of droping or falling ask costomer more detail on whaen it quit also full of crappy caps and resistors in vert section check there to
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1,476 Answers
Re: Problem with my tv
If you did not have vertical drive, changed the IC, and now you do but the screen is green with retrace, you probably had two separate problems. In many cases these kinds of problems are caused by bad solder connections. It would certainly make sense. First I would resolder all connections on all boards (or at least all suspicious looking ones) and see what happens. If you're lucky this will solve your problem. Good luck.
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Have you vertical deflection circuit checked for bad Vertical IC, and or Bad vertical Capacitors in the vert output section for the deflection board. Also have Vertical output Pump up Capacitor replaced, also have B+ voltage check coming from flyback transformer, for any open fusible resistors
It sounds like you have bad solder connections in the Vertical circuit or the horizontal circuit. The Vertical IC may need to be replaced if resoldering does not help.
You will need to call a good TV Tech for this repair.
Check for cold joints on the vertical chip. DS27880 sets use a la7841 typically.
If soldering doesn't fix it, simply replace the vertical as well as the 1ohm 1/2W resistor and
the fast recovery general purpose (nte556 equiv) near the flyback.
You have a failure in the vertical deflection circuit. This could be either a bad vertical chip, the power supply that runs the chip or a bad capacitor in that circuit. This is usually a repair best left to a professional. There is a small possibility that it could be bad solder connections. If genlty tapping the unit temporarily solves the issue you can try and resolder the pins on the vertical chip LA7841 is the part number. There is also a resistor 1 ohm 1 watt. If that resistor is open you can assume the IC is bad
This is a fault in the vertical circuit. It can be either a bad solder connection of the vertical IC or a defective IC. If you can solder, you can fix this yourself. Open up the back and locate teh vertical IC. It willbe a small flat IC attached to a heat sink and be marked LA7841. Resolder the pins first. If that fails to resolve the problem, replace the IC. Please note that there may be capacitors in the circuit that need to be changes as well, but without the chip working, it will be difficult to determine which ones. Update this once the IC has been resoldered or replaced with the results and we'll continue if necessary.
If the vertical is not defective or shorted there is a possiblity of bad solder connections on the vertical ic. If connections are good and has b+ voltage to the chip replace chip which is IC 501 LA7841 or LA7845 and change c511 (decimal point 1 film capacitor)
Try to connect to s-video tv and fixit ,another is conect to pc with tv card with s-video ,select pal in the program(ejem winvcr) and you can see the picture balck and white ,is ok to fix it.
Set has a bad vertical sweep IC. Also This Sanyo has a tendancy , when the IC blows out , to take the fusable resistor in the sweeo supply that feeds the vertical IC. This set should only be serviced by a trained technician because of ther high Voltage that lingers within. This repair should run you antwhere from 85.00 to 150 bucks. Good Luck
Wait what the support technical can help to my.
Thanks.
Jose
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