REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday 13 March 2019

LG BD 690 BLU RAY POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING

LG BD 690 BLU RAY POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING


    POWER SUPPLY CIRCUIT AND TROUBLE SHOOTING

NO POWER
No power problem occurs when you power on the unit.
F101, BD101, R101
Solution
How to troubleshoot (Countermeasure)
1) Look at the physical of fuse.
2) Check the bridge diode.
3) Check the R101 short or open.
NO POWER PROBLEM
No power problem occurs when you power on the unit.
C124
Solution
How to troubleshoot (Countermeasure)
Check all of voltage.

NOT DISPLAY OR NO BOOTING WHEN YOU TURN ON THE
POWER BUTTON
VFD does not display or no booting problem occurs when you power on the BD player.
IC301
SolutionPlease check and replace IC301 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check 5.3 VA of C213 (CN201).
Please check 3.3 VA of IC208 pin1.
2) Check the 1.2 V, 1.5 V, 3.3 V.
If 1.2 V, 1.5 V, 3.3 V voltage doesn’t come out,
check P_CON_5.3V1 (IC301 pin33) and P_CON_5.3L1 (IC301 pin32).
--> If you figure out those power control doesn’t come out any signal level (or voltage), please replace IC301 of MAIN board.
3) If X301 does not oscillate as the frequency of 12 MHz, first, check X301 and then replace IC301.
4) After changing it, if the set is still not booting, check MPEG IC(IC500). After changing it, if VFD is not displayed, check SMPS power (-29VA, FD+, FD-).

NO BOOTING WHEN YOU TURN ON THE POWER BUTTON

When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
IC601, IC602
Solution
Please check and replace IC601, IC602 on MAIN board.
How to troubleshoot (Countermeasure)
1) please check 1.5 V of C651.
2) If 1.5 V voltage doesn’t come out, check P_CON_5.3V1 of IC301.
--> If you figure out those power control doesn’t come out any signal level (or voltage), please replace IC301 of MAIN board.
3) Check DDR3_VREF of C619, DDR3_VREF must be 0.75 V. If DDR3_VREF is not 0.75 V, check the R581 and R582.
4) If the set is still not booting, check DDR IC (IC601, 602).

NO BOOTING WHEN YOU TURN ON THE POWER BUTTON

When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
X501, IC500
Solution
Please check and replace X501, IC500 on MAIN board.
 How to troubleshoot (Countermeasure)
1) Please check the soldering status of 27 MHz crystal (X501).
2) Please check the frequency of 27 MHz crystal (X501).
3) If the crystal doesn’t oscillate, replace X501.
4) After changing it, if the set is still not booting, check MPEG IC (IC500).


NO BOOTING WHEN YOU TURN ON THE POWER BUTTON
When you turn on your BD-P, it will display “Hello” message continuously on front panel, and it will not boot-up normally.
IC603
Solution
Please check and replace IC603 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check the IC603 on your eyes.
2) Check the /CE signal of pin9 of IC603.
First, If the /CE signal is not operating normally during booting, try to change IC603.
3) After changing it, if the set is still not booting, check MPEG IC (IC500) or DDR IC

AUDIO OUTPUT IS SMALL OR NO AUDIO OUTPUT
When disc is played, audio signal is small or audio output is not.
IC805
Solution
Please check and replace IC603 on MAIN board.
How to troubleshoot (Countermeasure)
1) Please check the IC805 on your eyes.
2) Check the 1.2VRMS level of pin20 of IC805.
If the 1.2VRMS is OK, check C806 (VBIAS).
3) If the set is still no audio output, try to change IC805.