Hitachi 14″ CRT TV Repair
The complaint of this Hitachi CRT TV was white screen with horizontal lines.
The first section to check is the output dc voltage from the flyback transformer.
The voltage should be about 180VDC and it is going to the CRT RGB circuit section.
The problem now is this voltage only measured 19.4 vdc which is too low.
I had to trace this 180 vdc circuit line and I found an electrolytic capacitor leads already bad and a leaky diode.
After the replacement of the both components, the voltage now read at 163.9 Volt which is still in the acceptable range.
Remember to clean the area with chemical and make sure all the components are properly fitted before turning On the power. Once done the cleaning, I powered On the TV and it was working fine.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link:
https://www.jestineyong.com/no-disk-in-dvd-player-repaired/
If you want to learn how to repair CRT TV then you can visit the link below:
http://www.electronicrepairguide.com/crt-tv-repair-ebook.html
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vinnie cheluget
August 5, 2015 at 1:48 pm
Thank you so so so much for you grate educating notes and tutorials .....Thanks once more for I have learnt a lot from you....God bless
Suranga Electronics
October 26, 2015 at 2:01 pm
thanks you..
Robert Calk
August 5, 2015 at 7:42 pm
Good job, Suranga. Thanks for the article.
Suranga Electronics
October 26, 2015 at 2:03 pm
thanks Mr...
AWAIS
August 5, 2015 at 7:52 pm
Really v good job i like soo much your informative links
that cause to encourage myself
which liquide chemical we can use to wash pcb please advise
Merlin Marquardt
August 5, 2015 at 9:23 pm
Very good repair.
Yogesh Panchal
August 5, 2015 at 11:01 pm
Suranga,
Thanks for sharing your experiance.
S Ramachandran
August 5, 2015 at 11:14 pm
very good repair and right method of attacking the fault. keep it up.
Zed Pato
August 6, 2015 at 6:48 pm
Good information for crt tv repair.
mahmoud
August 8, 2015 at 3:40 am
very good article thanks alot.
reza
August 8, 2015 at 1:09 pm
hi Suranga
thank u.
sherlan mamaril
August 9, 2015 at 2:07 am
i gonna repair the tv sharp similar to this and i have doubt that the video amp is the trouble, thanks to you sir jestine, you gave me more empowerment, ist a very similar symptomp
Hassan Ali
August 12, 2015 at 4:57 pm
Fine! A week ago a friend of mine brought Philips ( Model 21PT176) with the same fault (white raster with fly back lines). The 22microF/250V and the diode were fine and 175V was there.
I solved the problem by replacing the valve base with a new one!
Om Arya
November 23, 2015 at 1:10 am
Which chemical did you use to clean the PCB?
Irfan
September 15, 2017 at 1:16 am
i have 0v at rgb output of LA76810a. 8v supply to neck board is ok but 0v at rgb output pins so measured 0v at RGB amplifier transistors. There must be 3v at each pin of RGB output pins. Please help me what could be problem. What voltage supposed to be at input RGB pins coming from LA863328c IC. There is also 0v. I am too much confused whether first IC (LA76810a) is faulty or second on (LA863328c). Need your help dear experts
James Imaga Emetu
November 12, 2018 at 2:56 am
Thanks a million does this work for all crt tv brands especially Philips?
thanks once again
Collins MAMBWE
January 9, 2021 at 5:19 pm
Hello! Please help: My Hitachi-Fujian TV HFC-14P69 LED is ON but TV is not responding to buttons or remote. Most components Which components (circuit) must I check?
Collins MAMBWE
January 9, 2021 at 5:21 pm
Addition: The big capacitor after first rectifier is reading about 300VDC?