Lg Repair Tips

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Make	Model	Symptom	Problem
LG	STUDIOWORKS 520SI	Red color is missing	Transistor q-353 2n5551 was replaced
LG	STUDIOWORKS 520SI	Excess height	Replace r709(10k) e c709(0.1uf)
LG	STUDIOWORKS 520I	There is no image, when you turn on the control lights they flash for a few seconds until they stop and the traffic makes a hissing sound. from the power supply and has no high	Problem solved the problem was in the flyback, after changing it the monitor worked perfectly.
LG	STUDIOWORKS 520 SI CHASSIS CA-47	Monitor arrived to me with the following defect: the front panel kept blinking and it wouldn't turn on	I measured the horizontal output transistor, 2sc5280, which was shorted, I put an equivalent bu2508af in its place, but the defect continued, so I decided to disconnect the horizontal power supply and the monitor started normally, in view of the above I decided to change the flyback, just I put a new fly-back in place and the defect remains the same. If I leave the monitor on and off, the horizontal transistor heats up a lot and if I turn off the horizontal power supply, it starts normally, but without high voltage, it's logical. Man, this transistor is not correct. I tend to use the bu2520dx or the df (it works but it's not exactly the same either) check that those 2 diodes mounted on a heatsink aren't shorted or leaking in one of them for example, then let me know...
LG	LG 500G	Does not turn on without the tube plate connected to the main board	So by chance, I turned it on or the harness that comes out of it, and the monitor turned on... I noticed that it had all the pulses, but as if the processor identified the absence of this board, it didn't start, just tec, tec. well no At first there was a burnt resistance, but with its value changed, which feeds the video drive, stv9555 shorted and the power supply was in protection...
LG	STUDIOWORKS 500	This monitor makes a tec, tec, tec noise and doesn't turn on	The light doesn't come on and there is voltage in the secondary, I just don't know if they are correct. I already took the tsh and nothing. the +b voltage is 50 volts with or without the tsh. the irf has a pulse when he does the tec. I've already tested the tsh, replaced the ka3842, tested all diodes. it had a toasted resistance that powers the stv9555 (video amplifier), I tested this monitor without connecting the kinescope board, without connecting the wires to it... I already solved the problem...
LG	STUDIOWORKS 45I	The owner was using this monitor when it went out and a burning smell appeared	When I picked it up I saw a damaged resistor (c843) and a blown capacitor (c787), so I replaced both components, but when I turn it on the monitor keeps making a buzzing noise, which I think comes from the power supply, the LED lights up but nothing happens. It was actually the flyback that was burned. I removed the fly from the board and the power supply started normally, I replaced the fly and it worked perfectly.
LG	STUDIOWORKS 45I	With excess width and no control	Turning off the transistor width, it decreases. when I disconnect pin 32 of the 4558, the pulse hs (horizontal size) appears, having changed this ci, but without success. Horizontal capacitors all tested. This monitor arrived on the bench with a high problem (fly changed) and now has a width problem. If you turn off the width transistor and it adjusts again, it means that the problem is there at this point, there is a small transistor coupled to this width that is leaking. I already got a monitor like this..
LG	STUDIOWORKS 45I	Dark screen	Explain 1 (A,M) crossed out
LG	STUDIOWORKS 45I	Turns on but no image	When I measure g1 with the multimeter and touch the negative to ground and the positive to g1 the monitor gives an image!!!! I replaced the r871 and it worked!
LG	STUDIOWORKS 45I	It's not turning on, it doesn't give any signal	I thought it was the str s5717, I replaced it but it stayed the same, I measured the diodes and they were all good, I checked the tsh and it was fine too, what else would I have to analyze? This monitor causes a lot of flyback problems, try changing it and also try the IRF640 as it tends to go away with it.
LG	STUDIOWORKS 45-CHASSI CA 51	When I turn on the power key with the video cable disconnected from the cpu, it turns on with the LED in green, and the colors red then green and blue appear on the screen, when I connect the video cable to the cpu it turns off, staying with LED in orange color.	You can see that it turned off the horizontal, in my opinion it would have to be the opposite when I remove the cable from the CPU and it should have the orange LED. This monitor arrived at the workshop with a defect in the power supply's primary, it had a 22k resistor changed, it was replaced and turned on with this problem, the secondary voltages are all normal. Solved. It was the lack of horizontal synchronism signal that was not reaching the pin of the timing processor ci. The video cable wire was broken.
LG	STUDIOWORKS 44I SW	Resistor r 843 torrando	I changed it but it still doesn't turn on, removing the solder from the horizontal collector and it turns on. the r843 is 12k, and the capacitor next to it is 1uf/50v (replace it even if it looks good...). the capacitor was actually blown, the capacitor was replaced and the r 12k was placed but it didn't solve the problem, it turns on but stays on pulsating, flashing all the lights on the panel and making noise, but I didn't have much time for it today I got the lg441 schematic but I couldn't find the r 843 so I think I got the wrong schematic. What caused these components to blow? Did you change the flyback? His is the 6174z-1003d. It really was the flay-back.
LG	STUDIOWORKS 44M	Just a horizontal line on the screen	Vertical problem. change ic 701 (tda4850), c724 (100mf 16 volts), check c732 (1mf 50 volts) if it has low capacitance. It is located at the rear of the flyback.
LG	STUDIOWORKS 44I CHASSIS CA- 47	Completely inactive, does not even turn on the high voltage signal	I've already verified that the voltage reaches the capacitor, but not the "chopper". I disconnected pins 1 and 2 of the fly back, and the base of the transistor that is attached to the fly back housing. check the fuse components f901, r902, d911, c913, ic902, ic903, d741, q704, q761, if all of these are ok, check that the vertical output is not shorted (tda4866).
LG	STUDIOWORKS 44I	G1 very high. the monitor is high but grid 1 has -60 to -80 volts	Really high!!! it should vary between 0 and negative 50v. see q722, q724, q756, d793, d794, d797, c785 and others. actually c785 was leaking, replaced it and it started working again
LG	STUDIOWORKS 440SI	Sudden horizontal flickers on the screen	Sometimes it almost completely loses its shine, then it suddenly becomes good. shatters the sides of the monitor. pin 02 of the fly back is +b, and must be fixed at 65 vdc. if it is varying, it could be the d701 or q704. The most likely is the 10k/1kv ceramic capacitor, it is right in front of the fly back 6174z-1003d. Note: in this defect, the technician usually changes the s,h. and the fly-back..., but without success. They are not the villains.
LG	STUDIOWORKS 440SI	Turns on, but doesn't show video	Flyback shorted. to replace. code (6174z-1003d)
LG	STUDIOWORKS 440SI	It flashes orange and green, with a very loud noise in the power supply transformer	I already found the problem...there was resistance between the fly pacifier and one of the fly/focus/screm pins...I changed the fly and solved it........
LG	STUDIOWORKS 440SI	Turns on, but doesn't show video	Replaced c787 with problems