Any help??sony tv .the supply for horizontal driver transistor is zero volt.but when i disolder the 5 volts supply for system control...the set run.(but of coarse since no supply for system contol the control disabled.).
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
There is the possibility that; (1) the horizontal output Transistor has shorted out. (2) the horizontal driver transistor and last but not least (3) the H output transformer.
If you have a Isolation variable power supply meter, connect the tv set to the meter. Slowly raise the voltage to 70 to 90 volts ac, but, keep an eye on the amp meter. If the amp meter rises sharply to mid poit while adjusting the meter to 70 volts..stop...you have a "dead short". The set needs trouble shooting and the short(s) eliminated to solve your problem.
If you manage to raise the voltage to 70, turn the set on and raise the voltage to 90 vac. The set should come on, but, the pic will not be that great. This will tell you that you either have a problem with the H driver, a cap, or the H transformer.
Hi there. In sony tv`s the seven blinks code(sony error codes)usually indicates a high voltage shutdown(t.v has exceeded 33k volts). That is often caused by the power supply regulation and/or horizontal circuit fault. Hope this help Merry Christmas
If you have little experience of TV repair then take off back cover of Sony Kv-27FS210 and find Screen Control Knob on flyback transformer, turn that knob slightly CW or CCW and turn on TV to get picture. I think you need to turn ON TV few times to get proper adjustement of screen volts.
Above said procedure is for non-tech person. (Tech person will adjust screen volts (G2) as per procedure mentioned in service manual with proper tools.)
+13 & -13 requires for Vertical Deflection IC and produced by Flyback Transformer, these volts will be produced IF Horizontal deflection circuit works properly. so try to check H-Out Transistor and its necessary volts / signal. Pls also mention correct Model Number to provide you more help.
Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.
When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.
The most common problem with TV was the failure of the Horizontal Output Transistor, this will also damage 2 transistors in the power supply and a resistor in the power supply also. (From memory): Horizontal Output location # Q501, 2 power supply transistors Locations Q601, Q602, and resistor Location R607. Also solder the Horizontal drive transformer, you can find it by following the circuit board from the base of the Horizontal output. Some models used an IC instead of the 2 transistors in the powersupply, it will have six legs and check like 2 transistors. Good Luck.