TV Repair Made Easy
By Jestine Yong on September 12, 2009
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Electronics Repair Categories
Free Electronics Repair Newsletter
Shamshul
January 7, 2010 at 5:54 pm
1 - I want to know how to adjust vertical or horizontal if no VR at main board especially main board tv from china.
2 - where need to check when i on tv just led on but screen still no picture. already check voltage at 2ndary tfomer until flyback got voltage.
admin
January 9, 2010 at 11:25 pm
HI Shamsul,
Since the board does not have the VR, you may need to enter the TV service code to change the setting. Different TV have different ways to enter the service mode.
Screen no picture-does it has high voltage 24 kvdc?
Jestine
Shamshul
January 12, 2010 at 2:43 pm
Screen no picture-does it has high voltage 24 kvdc?
If no 24 kvdc, by means flyback still not work,where need to check ?can you teach me where is right point need to check if no high voltage 24kvdc? maybe all part after 2ndary transformer, fuuuuh!! maybe you can saparate it example - main ic or remote/channel ic or component2 related with the power section.i still blur if got the problem like this. please help me.
Shamshul
January 12, 2010 at 4:38 pm
i still got problem how to check good or bad flyback transformer.
admin
January 13, 2010 at 6:55 am
HI Shamsul,
Try this link:
http://www.electronicrepairguide.com/testing-flyback-transformer.html
Jestine
admin
January 13, 2010 at 6:57 am
HI Shamsul,
The flyback need B+ voltage (110 vdc) and a horizontal drive signal in order to be energized. Check this link below or get a book on TV repair as it has all the explanations about how Tv works:
http://www.scribd.com/doc/2957819/TT204-Identifying-television-SMPS-problems
jestine
ShamsulJ
January 13, 2010 at 7:35 am
thank for your info, i will try the best.
ShamsulJ
January 15, 2010 at 10:20 am
what can i do when the flyback burn but the part number of the flyback already missing from the body. how can i replace it. may be you have a method how to find the right flyback need to be use.
admin
January 15, 2010 at 10:24 pm
HI Shamsul,
Sorry, there is no way to find the replacement unless you can find the model of the set and the schematic. From there you will know the flyback part number.
Jestine
Shamshul
January 17, 2010 at 2:15 pm
TV AIWA - Problem just only red color missing at the picture, got only blue and green. already adjust vr (R-cut off and R Drive)at matrix board but still no pure red didn't came out.already check voltage RGB point start from IC until matrix board same voltage compare to the others. can i know maybe that is ic problem?
admin
January 18, 2010 at 6:18 am
Hi Shamsul,
The best is to use scope to compare the RGB signals. If you do not have scope, the best is to direct replace the IC and retest.
Jestine
Shamshul
January 25, 2010 at 4:43 pm
TV AIWA problem is red color will missing when see tv program from area or AV , when press menu button red color will appear but tv program still running with no red color. may i know how the color section work ?
Shamshul
January 25, 2010 at 4:46 pm
Already replace main ic but still fail. why when on tv no colour until 5 minutes the color will appear.
admin
January 29, 2010 at 8:45 am
HI Shamsul,
This got to check and i read in one of the repair book and said that a bad crystal could also cause such problem.
Jestine
admin
January 29, 2010 at 8:47 am
HI Shamsul,
I guess you need to get a book on TV repair (buy it from Amazon.com) as it has full explanation how the color circuit work. Or you can visit this link for repair information:
http://www.repairfaq.org/samnew/tvfaq.htm
Jestine
Shamshul
February 7, 2010 at 5:09 am
TV brand MECK, got vertical problem. Problem is when on tv just only one line at the center about 0.3cm. already changed the vertical ic and all component at vertical part - still fail. main ic also changed but still fail. replace yoke also fail, any other part related with vertical need to check?.
admin
February 8, 2010 at 5:54 am
Hi Shamsul,
One horizontal line or one vertical line in the display?
Jestine
Shamshul
February 8, 2010 at 12:08 pm
There is one horizontal line at the center.
admin
February 9, 2010 at 8:37 am
HI Shamsul,
What is the supply voltage to The vertical IC?
jESTINE
Shamshul
February 13, 2010 at 12:33 am
Supply voltage to vertical IC around 25v.
admin
February 13, 2010 at 8:50 am
HI Shamsul,
If you have check the components and replaced the vertical Ic then i guess it could be components that breakdown when under load. This you have to replace one by one the components in the vertical section.
Jestine
Shamshul
February 15, 2010 at 5:32 am
TV Sony trinitron (old), problem no power, already check and found 1 small transistor but got only 2 leg already burn, location at 2ndary tformer 160v direct to flyback, i think that is same function like fuse.already changed it but when turn on - burn again. and flyback got sound tik tik tik tik something like that.
admin
February 16, 2010 at 9:53 am
Hi Shamsul,
You need to isolate the problem by following the link below:
http://www.scribd.com/doc/2957819/TT204-Identifying-television-SMPS-problems
Jestine
Shamshul
February 19, 2010 at 12:30 pm
TV Sony 14inc - problem no power, after check found STR short circuit, already replace it, turn on power OK but just only for one day. tomorrow try to on power fuse blow and STR short again.
Another question - if i want to buy your e-book how can i pay bcoz i don't no how to use pay pal and i don't have a credit card and can you give me a discount or less.. he he.
admin
February 20, 2010 at 11:53 pm
HI Shamsul,
You may need to check all the corresponding components before replace the power IC. Make sure the power ic have heat compound too. May i know where are you from?
Jestine
Shamshul
April 1, 2010 at 11:59 am
Hi justin, I want to tell you that i don't have the oscilloscope, can i solve the SMPS problem just only used the analog and digital meter. if i buy your SMPS ebook it can help me or not?
admin
April 2, 2010 at 5:59 am
HI Shamsul,
The more equipment you have the faster you can solve a problem. Yes my SMPS ebook will guide you to solve power supply problem but again as i have mentioned above, it is good to invest in more test equipment in order to have higher success repair rate.
Jestine
Shamshul
April 2, 2010 at 12:03 pm
how much one set oscilloscope? RM1k or RM2k, can i get the 2nd hand.?
admin
April 2, 2010 at 8:13 pm
HI Shamsul,
Is about that range but it depends on the MHZ. The higher the MHZ the higher is the scope. You can try find second hand one from Pasar Road or check from your local Yellow Pages.
Jestine
Shamshul
April 30, 2010 at 2:21 am
TV brand toshiba, problem screen full during not insert tv aerial. when insert aerial tv got signal tv1,tv2 & tv3 channel but vertical drop about 3cm upper and lower side for all channel. (old tv no video input output)
admin
April 30, 2010 at 10:54 am
HI SHAMSUL,
Try check that the supply voltage to the vertical IC is good and stable.
Jestine
Haiqal
October 10, 2010 at 8:14 am
hi there,
I have a problem with my Philips TV 29PT4223 (Power Vision) manufactured around 1999. The problem is when I turn on my TV, half of the picture went missing, and the blank spot is filled with flickering image. What went wrong with my TV and why is this happen? I had used this TV for nearly 11 years and I'm very used to it. I just want to know if I need to repair it, how much it's cost in Johore (I live in Muar). I hope that you can help me. Thank you.
admin
October 11, 2010 at 10:06 pm
HI Haiqal,
Each repair shop charge differently. You may need to consult them first before you send the tv for repair. Your tv problem is in the vertical section. There could be dry joints in the vertical output ic or missing or low supply voltage to the vertical IC. If all tested good then the problem could be in one of the corresponding component.
Jestine
eanshan
October 16, 2010 at 10:04 am
hi sir
my tv main board is china..
there some problem i can on the tv but only blue screen no picture and no sound.. i cant use remote not function..how to fix this problem please sent good answer..
admin
October 17, 2010 at 8:41 am
HI Eanshan,
Did you try to run from DVD player instead of from the tuner receiving TV station?
Jestine
ibrahim
October 31, 2010 at 7:24 pm
saya ingin tahu bagaiman nak buat service tv tiada raster dan suara untuk tv singer 25inc
admin
November 1, 2010 at 3:04 am
HI Ibrahim,
Kamu kena check B+ voltage samaada kat salah satu flyback pin. Tanpa B+ voltage ataupun signal ke horizontal output transistor maka high voltage tidak akan dijanakan. Check samaada voltage ada kat pin audio IC?
Jestine
Lee
December 4, 2010 at 10:05 am
Hi Jestine,
TV Panasonic model TC-PD21VN.
Cause the picture brightness is little low. When adjust the contrast/brightness or FBT screen (EC2) high, the picture become horizontal line. But when adjust back to low, the picture become normal.
Already replace the vertical IC & capacitor for vertical part. Is possible the flyback problem ?? Please help.
admin
December 4, 2010 at 12:43 pm
HI Lee,
Brightness low can be caused by a weak tube. Please refer to this link:
http://www.repairfaq.org/samnew/tvfaq/tvdarkpic.htm
Jestine
Lee
December 7, 2010 at 9:35 am
Thank you for your information.
ALI MAMINTA
February 16, 2011 at 6:45 am
good evening,sir.my problem is the part number of FET Q461.I don't have schematic diagram to check it.my tv is JVC Model AV-25VA15 CRT TV.i lost the pulled-out FET as sample.can you help regarding this?
admin
February 16, 2011 at 9:26 am
HI Ali,
Sorry i do not have the schematic too thus i can't tell you the exact part number.
Jestine
alex fuerte
March 26, 2011 at 7:45 am
im new to repairs, but have basic background on electrical and electronics, i have a certain problem on a tv the color picture and sound is ok but the screen has a lot of horizontal lines and screen is flashing fast tried to adjust settings on the flyback and inspect for some wornout parts, resolder some capacitors and resistors but it is still the same..can u help me on this..
alex
March 26, 2011 at 7:57 am
by the way this is the best site i have found and it interest me much surely we can learn a lot from it, thanx to you jestine...i wish i could do the same sharing ideas...but my goal for now is to learn and be of help to other people if i can even in small ways...like repairing stuffs at a very friendly price some goes free for my relatives and friends i guess if the problem is not that hard...
admin
March 29, 2011 at 8:49 am
HI Alex,
First make sure the output voltages from the power supply is good and stable and next would be to replace the vertical ic and retest.
Jestine
admin
March 29, 2011 at 8:50 am
HI Alex,
You are welcome and in the meantime you can visit this link that i found it to be good:
http://www.repairfaq.org/REPAIR/
Jestine
tu foon
April 16, 2011 at 4:30 am
good day,
an rca model no.f27242gy keeps blowing fuse and h.o.transistor.i'll appreciate any info.thanks in advance
Mahendra
April 16, 2011 at 10:30 am
1- I want to know how to adjust vertical or horizontal if no VR at main board especially main board tv from china.
2- Tv picture quality is good but picture is slightly tall.
admin
April 16, 2011 at 3:55 pm
Hi Tu foon,
Yes there is a possibility the flyback have problem. You may visit this website for more info:
http://www.electronicrepairguide.com/testing-flyback-transformer.html
Jestine
admin
April 18, 2011 at 5:54 am
HI Mahendra,
You may have to go into the service mode provided if you know the combination keys in the remote control for that tv.
Jestine