REPAIRING AND NOT THROWING AWAY

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 !

Friday, 29 March 2019

SHARP LCD TV TROUBLESHOOTING

SHARP LCD TV TROUBLESHOOTING


SHARP LCD AV MONITOR LC28HM2 Power and Display unit Circuit Diagram
LC32DH65E LC37DH65E LC46DH65E LC52DH65E LC32DH66E LC37DH66E LC46DH66E LC52DH66E LC32DH77E LC42DH77E LC46DH77E LC52DH77E LC32DH77EB _ Troubleshooting
SYMPTOM:  Dead or stuck in standby. All Sharp LCD TV sets have a Lamp Error detection circuit which will return the LCD TV to stand-by if a fault is detected, the fault is logged by the lamp error counter which will render the LCD TV inoperative if it the error count reaches 5. To enable fault finding the lamp error detection circuit is ignored when service mode is activated. Service mode activation is detailed in the relevant service manual. After the fault has been diagnosed and repaired the lamp error counter must be reset to “0” before normal functionality is restored, again this is detailed in the relevant service manual.
CAUSE:  Possible causes of this symptom are:
> Inverter circuit failure (switching transistors)
> Lamp failure (no or low output)
> Poor or loose connectors, fuse holders (lamps or inverter board).
> Dry joints (power supply or inverter board).
> Trapped or chaffed cables to lamps. 
> Power feed to lamp inverter circuit. 
> Fault in error detection circuit
ACTION : Repair the unit as necessary and reset the lamp counter.
LC32DH65E LC37DH65E LC46DH65E LC52DH65E LC32DH66E LC37DH66E LC46DH66E LC52DH66E LC32DH77E LC42DH77E LC46DH77E LC52DH77E LC32DH77EB
SYMPTOM:  Takes in excess of 1 minute to switch On.  No power and lamp error indication.
CAUSE:  Errors on the 3.3v + D supply line.
ACTION:  Locate C9668 on the under B-side of the Main PWB using figures 1 to 4 and replace.
REF NO DESCRIPTION PART NUMBER PRICE CODE
C9668 Capacitor 68 nF SMD VCKYCZ1AB683KY AB
MODELS LC32D65E LC32DH66E LC37D65E LC37DH66E LC46D65E LC46DH66E LC52D65E LC52DH66E
SYMPTOM:  Green LED and No backlights.
CAUSE:  Corrupted firmware.
ACTION:  Install the latest firmware as detailed in the service manual using a USB stick, then enter the service mode and ensure the necessary adjustments for screen size etc are reset.
MODELS LCxxD44E LCxxD65E LCxxDH65E LCxxDH77E
SYMPTOM: Unit enters trip mode. Green LED illuminates then the set goes to standby a few seconds later.
CAUSE:  Lamp error counter reaching maximum limit. If the lamp counter is reset, the set will work until the limit is reached again.
ACTION:  It has been found that any of the lamps within the LCD panel may not be fitted correctly and cause’s the lamp to function intermittently and an error is then produced. Carefully and in a clean environment remove the LCD panel from the cabinet fascia and then remove the LCD glass sheet and diffuser to expose the backlights. Look at the lamp connections within the back panel and ensure the lamp metal contacts are correctly located.
The Lamp contact in Figure 1 is only sitting on the edge of the end clamp; Figure 2 shows a correctly fitted lamp.
SHARP LC28HM2 Power unit schematic

Display amp unit schematic
CLICK ON THE PICTURES TO ZOOM IN
Posted By: FRANK at 02:23
TAG: , , , ,