Lg Repair Tips

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Results: 4962

Make	Model	Symptom	Problem
LG	VARIOUS	Modifying r/c to access service modes	There is a service remote availiable but if you have a remote which uses an saa3010t ic , simply connect a tact switch between pins 1 & 11 to access the service mode .
LG	LV710	Wont tune - "safe" displayed	Sus eeprom
LG	KE14U73 COMBI	Swirling lines & static pops on pic	Poor earthing of the deck to the screen large vcr screening can
LG	KE14U73	St/by only	Ht present but no 8v supply to ic500 jungle chip pin 37. d850 in psu leaky
LG	CI21T24F	St/by only - red led lit no power to psu pri	Dry joints rl108 relay
LG	CI20E20	Dead with strs5707 chopper chip & bridge rect s/c	Also replace 4 x elects in psu
LG	CI14B50F 11.1	St/by only - no line dr	No 12v supply to line dr trfmr tr101. check back from pin 15 chopper trfmr - r410 0r1 o/c & dry joints chopper trfmr
LG	CF28C22F ETC	Field collapse	Fit mod kit kitpc33j (7 parts inc)
LG	CF25A50F	Reverts to st/by aft 2-3 secs, ht drops to 60v	Ic351 fop chip tda8350q & fr350 10r fusible
LG	CF25A50F	Field mod when foptr has blown	Fit tda8350q & use heatsink compound as well as the grey thermal transfer pad between the chip & the heatsink. change c352 to 22mfd (was 47mfd) 50 volts change c708 to 22mfd (was 47mfd) 100volts . this is located to the left of the lopt on the 45 volts rail. change fr359 to 22Ω half watt fuse resistor (was 10Ω) this is also located to the left of the lopt on the 45 volts. rail. add a 0.01 mfd cap on pins 8 & 9 of the frame chip & 0.1mfd between pins 7 & 8 (both 100volts)
LG	STUDIOWORKS SW57I / CS590	With the horizontal width greater than the screen view, even with width control at minimum	Obs ca-46 check the width transistor, it may be shorted, remove it from the board and see if the image shrinks, if it shrinks, replace it, if not, check associated components!!!
LG	STUDIOWORKS SW563A	Does not turn on, power supply voltages ok	I've already touched fly, micro, oscillator and it didn't solve the problem, the LED is very weak in orange. If the power supply of this monitor is ok, micro ok, oscillator ok, memory ok, changing the micro oscillator crystal. solved the problem.
LG	STUDIOWORKS SW563A	It arrived at my bench with the flyback swollen...it turned on and there was no video	I changed the fly, now the same as in the video, but the image has high contrast, even the adjustment is insufficient, and more or less in the middle of the screen there is a belly to the right so that you can look straight ahead... leaving the screen a little crooked, the same as the adjustment for this... but it's not enough... solved the problem... flyback that I bought came without the wire that goes through the fly's ferrite... then the contrast is horrible and crooked screen...I put one from a used fly and solved it.....
LG	STUDIOWORKS SW485 -CHASSIS CA-51	Dead	I went straight to the q704 (irf 640) showing a short in allΩic measurements. replaced the monitor worked normally. Note: this LG chassis is widely used by Unisys and Digital companies.
LG	STUDIOWORKS 77I 17"	Comet tail defect	This defect has basically two causes. Of course it could be problems with the cathode voltage filter capacitors but it's a little more unlikely. You said you've already tested these capacitors, "don't test" replace them. the two reasons are: coupling capacitors, and weak image tube. replace mainly c340, c341, c342, c347, c348, c349. I changed the TRC plate but it still gives the same defect. I discovered the problem... it was the damn tube itself, I changed it, it solved it.
LG	STUDIOWORKS 77I 17"	With frame increasing and decreasing	After several replacements of suspicious parts and no success, I found that when I increased the screen the frame also increased. I found that below the screen control there are 3 pins and 1 of these pins the voltage also varied. I verified that the voltage came from a c.i. which is behind the fly (lm358) I changed the c.i. and everything was normalized.
LG	STUDIOWORKS 77I 17"	Gun power supply but it doesn't have high voltage I'm in doubt is it the fly...or is it something else	Also check the +b fet, it also causes this defect!!! ok!!!thanks a lot for the tip it really was the fly
LG	STUDIOWORKS 775N- CA80	Does not adjust width and pin cushion	Check q 709 (2sd1413 you can use tip122 but insulate the collector with mica) and if it is good check leak or short in d 704 there is no substitute for it and you can ONLY use dmv32 or dmv56.
LG	STUDIOWORKS 775N	The monitor arrived at my assistance with the tsh burnt out (2sc5803), I replaced it with a bu2508af, then the monitor worked for about 3 minutes then the output burned out again.	You have to put the original transistor, with the bu2508 it really burns!!!
LG	STUDIOWORKS 775N	A resistor burned out where its resistance value is very low, I believe, because on the board it is located at (j169) close to the fly-back.	Take a look to see if it's not a 0.33Ω / 2w one, it looks like that's the value. Check the double diode, it's probably also leaking. This resistor is just a current limiter. Thank you, it worked.