Sony Triniton TV

This is a Sony Trinitron, Model KV-20M10, manufactured in July 1995. The unit exhibits no blinking lights or clicking sounds, indicating a potential internal hardware issue, particularly with the BA-2 chassis. To diagnose the problem, the unit must be opened for visual inspection and voltage measurements to confirm faults and facilitate repairs. A DIY repair approach may be considered if the individual possesses knowledge of electronic components and has access to tools such as a multimeter and a soldering iron. The individual has a small handheld meter for measuring volts and ohms, as well as a soldering iron, and is contemplating whether this equipment is sufficient for the task.

To begin troubleshooting, the back cover of the television should be removed by unscrewing four screws. The high voltage transformer (flyback transformer, FBT) is located on the rear right side of the unit, identifiable by a large red or black wire leading to the top of the CRT. The FBT should be inspected for any signs of damage, including cracks or high voltage leaks. After visual inspection, the TV can be powered on to check for a glow at the rear, indicating that the heater voltage is functioning, which suggests that the high voltage and horizontal circuits may be operational.

If no signs of arcing or high voltage are observed, the SCREEN adjustment at the FBT can be marked and adjusted using an insulated screwdriver until the screen brightness changes. This adjustment may produce a "snowy" screen without a cable connection, and further adjustments can lead to a yellow/green screen with slanted horizontal lines.

Transistors located on the circuit board, including Q771, Q772, Q773, Q711, Q731, Q751, and Q770, were tested. The results indicated various screen color changes when probing the transistors, suggesting possible functionality or issues with these components. For example, Q771 and Q711 caused the screen to turn red with stripes, while Q772 and Q731 produced green hues. Q770 produced a clicking sound, indicating potential relay activation, which may be relevant to the troubleshooting process.

The absence of extensive technical knowledge in testing transistors may limit further diagnostics, but the observations made during testing may provide useful insights for a more experienced technician.

The troubleshooting process requires careful handling of components and adherence to safety protocols, especially when dealing with high voltage areas within the television. Proper documentation of observations and adjustments can facilitate further analysis and repair efforts.This is a Sony Triniton, Model KV-20M10, manufactured July 1995. There are no blinking lights (there really are no lights to blink) or clicking sounds. The described symptom on this particular model using a BA-2 chassis would indicate an internal hardware issue. The unit would have to be opened up for visual inspection, voltage measurements, confirm fault and effect repairs.

Are you then considering a DIY (do-it-yourself) repair approach Are you familiar with electronic components, have access to / comfortable in the use of a multimeter and perhaps even a soldering iron/hot-air station I would like to try the DYI approach since I have nothing to lose. Getting it professionally repaired would probably be close to the cost of a new TV, don`t you think. I have a small handheld meter which shows volts, ohms, and whether two points are connected. I also have a soldering iron, which I am more familiar with than the meter. Am I adequately supplied to delve into this venture First, get the back cover off (4 screws). Closely inspect the rear right side (looking from the back). The high voltage transformer (FBT) is located here with a big red/ (sometimes black) wire going to the rear top of the tube.

Check the FBT for any sign of cracks or high voltage leaks, arcing. Carefully plug in and power on the TV. Check if there is a glow at the very rear of the TV. This is the heater voltage and it also is an indicator that the high voltage/horizontal is most likely operating. It is also possible to check the FBT for stray high voltage. With the cover still removed, power on the TV and darken the room. Within a safe distance, check for any bluish glow or high voltage arcing. I see no signs of cracks or arcing in the transformer. The only glow I see when plugged in and powered up, is in the large glass tube plugged into a small circuit board on one end and the very back of the CRT on the other end.

I see no bluish glow or high voltage arcing. Please place a marker of the current position of the SCREEN adjustment (at the FBT). Adjust the SCREEN using an insulated screwdriver until the screen becomes bright. This would serve 2 purposes: Done. With a minor adjustment, the screen becomes "snowy" (I do not have the Cablevision cable hooked up to the TV). With a little more adjustment, the screen becomes a yellow/green color with slightly slanted horizontal lines about an inch apart.

Turned all the way up, the screen becomes a brighter yellow/green color with the same slightly slanted horizontal lines about an inch apart. Okay, here is what I`ve found out; I don`t know if any of this will be useful to you. I am a widow, using my husband`s tools, and some of my own intuition. I don`t know how to test tranistors, but I did find transistors Q771, Q 772, Q773, Q711, Q731, Q751 and Q770.

Nothing happened on any of transistors when the top pin was touched with one probe and either of the other two pins were touched with the other probe. All the action was with the bottom two pins, and it didn`t matter which probe touched which of the bottom two pins - I got the same reaction both ways.

The reactions were thus: Q771 - the screen turned red with stripes, Q772 - the screen turned green with stripes, Q773 - the screen turned blue, Q711 - the screen turned red with stripes, Q731 - the screen turns green briefly before the TV turns off, Q751 - the screen turns blue, Q770, and this is the interesting one - I heard a click, like the sound of a relay coil pulling in, then after a brief delay the screen turned to a regular white/black snowy (s 🔗 External reference