Standby Problem In Haier LCD TV Repaired
A customer sent to me this 24″ Haier LCD TV for repair with the complaint of red standby light on with no picture. The usual standby problems are :
- DC output supply from SMPS fluctuates or lower than normal (due to bad filter capacitors)
- Bad SMD voltage regulator IC in the mainboard- produce a lower than normal voltage
- Corrupted data in Mirocontroller, Flash Rom or even EEprom IC
Once the cover was removed I can clearly see two circuit boards. It was the power supply and mainboard-see the photos below:
I’m a bit happy to see that there were several bulged filter capacitors. This could be the reason why the LCD TV went into standby mode because the Microcontroller IC did not get a steady dc voltage input.
If the filter capacitors were good then I may need to put some extra effort to look for the data for the memory ICs. For your information it was not an easy task to find original data/programs for the memory ICs.
After replacement of five electrolytic capacitors, the LCD TV came back to life and you can see the photo below:
If you wish to learn how to repair LCD, LED or even OLED TV, I suggest that you check out on Kent’s website here.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous post in the below link:
https://jestineyong.com/7n65c-power-fet-shorted-in-singer-hi-fi-dvd/
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Angelo
August 7, 2017 at 12:19 pm
Thanx sir
quite easy n time saving article...
Straight to the point
Albert
August 7, 2017 at 3:39 pm
Pro job Suranga, thanks! Knowing how many times e-caps are bulged we maybe should make a list of what manufacturer made them? It is known that there was a problem with the chemical e-cap electrolyte substance in the past. But that was already years ago after they said that an employee took off with the right formula and many bad e-caps were produced afterwards. It would be interesting to know what chemicals they exactly use nowadays. Also because it is said they contain unhealthy carcinogenic chemicals. And if it was not a too high DC voltage, it maybe was the bad electrolyte that made them bulge?
Parasuraman
August 7, 2017 at 4:13 pm
Very easy solution, lucky too!
Moniem
August 8, 2017 at 11:20 am
Good job sir
Ulises Aguilar Pazzani
August 8, 2017 at 12:00 pm
Mr Suranga Bandara, great fix Sir
Yogesh Panchal
August 8, 2017 at 10:44 pm
Good Job! Suranga.
Charles
August 11, 2017 at 3:46 am
Thanks for clarity in your article sir that is very helpfull well done on your good repair
Humberto
August 12, 2017 at 12:20 pm
Good job Suranga.
john
August 15, 2017 at 12:34 pm
74cm CRT show h line already checked all power supply all good 34v present to vertical ic.an i changed it to new one as well as main ic 8895.but problem remain.hout 130v present an test good.what could problem its teledex.
joku
August 23, 2017 at 11:29 am
i have the problem for tv lcd/led haier. the problem is when the plug on to source voltage indicator lamp red on and when klik the power swicth blue lamp on and few minute back to red. please give me any solution thanks.