Sorry. I don't know which one sharp. here only the pcb. in pcb mark: duntk9988we, used STR F6654, tr horizontal D2586, vetical ic TDA8357J. thx sir from your help.
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Check all the related components at the power regulator circuit; after de-solder out the STR from circuit. If all are found OK, the STR is faulty. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the phrase " My service table today " in the search box of the display window [at the top right]. You'll get related posts gathered for reference.
Check all the solder terminals to this Regulator IC, for any loose soldering. It will be best to resolder all the solder terminals to this IC, by applying a little more solder to each solder terminals, without making any solder bridge short in between adjacent solder terminals. Take extreme care when soldering procedure, as there will be dangerous voltages will be present, even after switch off the set. If you wish to get the schematic diagram for STR F6654, get it from the site linked here. http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by its
left side bar, or view it in Timeslide option. Surf the site with patience.
You haven't vertical deflection.
The ff caused the problem.
1. Dry joints on the vetical section.
2. Blew Vertical ouput IC
3. Open yoke vetical winding.
4. No vertical output from jungle IC.
5. Open supply for vetical ic due to open fusible resistor.
I've suspect that you have #1 and #2 fault. This is not Diy so I've advice you to send to repair shop or look for a qualified tech to isolate the problem.
This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical. Be sure to vote/rate me if this helped Thanks! In this case the vetical o/p IC is LA7838 and the IC is located at the right front corner of the PCB (main)the 2 capacitors are- 100uf 35V and 220uf 25V.
try to plug in again...if there's no reaction at all, then the power suply section may checked...(I.C. regulator str.... followed the horizontal output transistor or some of the zener diodes regulator or broken PCB line
This is a problem with the vertical circuit. If you can solder, you should be able to fix this. With teh unit unplugged, open up the back and locate the vetical IC. This should be a small flat IC attached to a heatsink with about 9-11 pins. It may be marked LA7837 or something similar. Try resoldering hte pins. If that fails to resolve the problem, replace the IC. I will look up your specific model and try to get more details.
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