Picture Shaking Problem In CRT TV Fixed
Again I have got a call from my friend whom I have repaired the CRT TV earlier for the color patches symptom on the display screen. This time he said the display shakes vertically and sometimes TV gets intermittent on off.
So again I visit his place and start troubleshooting on his TV. I opened the TV cover and started analyze the problematic area. Most of the time this type of problem is due to dry solder on PCB so I have checked and found some dry solder on Main PCB and as well CRT Base PCB. I have revived some dry solder and put the TV “ON” but the problem is same picture shake vertically . On visualizing the component side I found one capacitor beside EHT was Bulged and the value was 22uF 160V.
So I have relaxed by assuming that I have found the culprit so I replaced the capacitor and turn On the TV but still with the same problem. Still I have doubt for some dry solder or loose connection hence by holding my screwdriver reverse (Metal part in hand and handle on PCB Side) I have tapped on some stages on PCB (while power is still On) to find out the culprit but no success.
Now I decide to test some reference voltages on PCB in order to locate the bad area. I have started with testing voltage across main filter capacitor on power supply section. I found 300V DC so this area is ok and now I moved directly on Horizontal Output Transistor (HOT) side. I tested the B+ Voltage on horizontal output transistor collector (middle leg) and I found 90 VDC so this area also OK now what??? Now I have doubt for the BAD capacitors on the circuit but I do not have ESR meter and I do not keep many capacitors with me so I just make a mind to windup the troubleshooting and install with a new KIT.
Just for second opinion “I have contacted one of my GURUS” in the same field as per his experience he guided me to just adjust the B+ Voltage in power section and see what is the effect as per his direction I have again started the trouble shooting and on adjusting the preset I do not get any effect so I removed the preset and check it off board. I found this 2K preset was “OPEN” circuit. It was not giving any reading while testing it with my Multimeter hence I replaced it with a new preset and the TV was back to life again.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Waleed Rishmawi
October 21, 2014 at 7:36 pm
yep, that usually causes problem good job on the repair.
Yogesh Panchal
October 22, 2014 at 12:17 am
waleed thanks for comment
Amir Mukhtar
November 19, 2014 at 12:48 pm
Good Job Yogesh . Keep sharing Expetise Work to learn more .
thanks you
Amir
Frank Terzo
February 15, 2020 at 8:10 am
Hello what causes crt jumpy shakey picture problem and flickering
moshe
October 21, 2014 at 7:45 pm
another great insight into the crt side of things!
Yogesh Panchal
October 22, 2014 at 12:15 am
thank you sir.
raymundo saura
October 21, 2014 at 9:00 pm
thnaks sir
Yogesh Panchal
October 22, 2014 at 12:17 am
Your Welcome.
mulik shivaji
October 21, 2014 at 9:32 pm
Sir! I have also faced same prob . But 2 times i found 100 mf/63v capacitor in smps sec side faulty which is used in H driver supply filter.. pl note & feedback. Welcome.
Yogesh Panchal
October 22, 2014 at 12:26 am
noted. Muilik every thing is depend on design of the circuit and most of the time culprits are electrolytic capacitors i think better way to find is ESR Meter.
Robert
October 22, 2014 at 12:24 am
Good job Yogesh. Thanks for the article.
Humberto
October 22, 2014 at 12:53 am
Good repair this second time, congratulations again
jirasak
October 22, 2014 at 1:06 am
A very technical knowledge forme and thank you for giving your useful experience to all of us
Luciano Khware
October 22, 2014 at 2:25 am
Mr. Yogesh,
This is yet another great article. Keep it up!
Austin
October 22, 2014 at 4:00 am
yes,that is why you got 90V on HOT Collector, which is too low,the voltage suppose to be up to 110v,congratulation that you eventually fix the fault.
Imraz
October 22, 2014 at 5:25 am
Thanks for sharing. A rare fault to find.I assume experience of you guru paid off. Thanks
jojogreg
October 22, 2014 at 9:58 am
How did you come up with the idea that the culprit was the 2k preset?
What does this preset function in the television circuit?you maybe elaborate a bit what this part in the tv circuit works?
James
October 24, 2014 at 9:56 am
I want to know that too.
Yogesh Panchal
October 28, 2014 at 12:57 am
jogger,
This 2k Preset is located in power supply section which control Output voltage.As for CRT TV +B volt at HOT Collector working voltage should be around 95 to 115V DC (Please confirm / refer to circuit Diagram of respected model)where i am getting 90VDc.Hence when i tried to adjust the voltages from this preset but there is no voltage improvement on HOT collector Voltage on that i have doubt about this preset and i have tested it out of circuit and i found this preset bad.
Andre Gopee
October 22, 2014 at 11:01 am
Excellent trouble shooting Skills... Keep it up.
beh
October 22, 2014 at 11:49 am
YOGESH: thanks for this good repair report.
Peter Kakamo
October 22, 2014 at 11:52 am
Much Thanks to you,for sharing your knowledge and experiences to to all of us.
l.boopathiraj
October 22, 2014 at 4:57 pm
good job
Tito
October 22, 2014 at 7:33 pm
Excellent job Yogesh,it has really widen our knowledge.
Joshua Oloo
October 22, 2014 at 7:45 pm
Yet another great article sir.keep it up!
Joshua Oloo
October 22, 2014 at 7:47 pm
Another great article sir.keep it up!
Yazid
October 22, 2014 at 8:13 pm
Very good knowledge and technical troubleshooting to learn from you keep it up thanks Yogesh.
Yogesh Panchal
October 23, 2014 at 5:32 pm
Thanks everybody for your Comments.
Taofiki ishola Akinleye
October 23, 2014 at 7:20 pm
What you said is truth,I have replace such thing and it works.Thanks very much.
tesfaye kebede
October 26, 2014 at 10:48 am
thank you yog.. and for J all ways a new repair article i got
Fernando Frias
October 26, 2014 at 1:12 pm
Yogesh Panchal good job!
shahid ahmad
October 26, 2014 at 11:56 pm
thanks
Amir Mukhtar
November 19, 2014 at 12:49 pm
Thanks you for sharing Informative Repair Solutions .
Mr Yogesh Panchal you did great Job .
Great work
Amir Mukhtar Ashrafi
Sarwar Khan
February 2, 2015 at 3:38 pm
A very good article. Have you faced / solved shaking picture problem in LCD also ? Kindly share results. Thanks.
shivakumar
April 20, 2016 at 2:19 pm
Dear Friends, I have a LG FLATRON TV, There is picture shacking vertically, and collapse with off screen , its moving up-down. please help me in this case, should I change all the capacitor of the PCB?
mani
April 26, 2017 at 7:31 am
14" CRT TV shaking problem. so how is solve the problem. pls help me.
safiqur rahamann
August 19, 2017 at 8:10 pm
panasonic crt tv picture shaking vertically, remote menu button is not receiving by tv though there is light from menu button. I checked by mobile camera. before that eht or light was not coming regularly.sound ok. screen blue light in av mode vanished. power at all cathods nearly 140 v. what may be the cause, please anyone suggest.
KENETH
December 28, 2018 at 1:52 am
This article is wonderful, but just that no image of the preset was not attached, some of us don't understand names of must of this part
henok
April 29, 2019 at 2:59 am
Very helpful article. thank you.