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.

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..............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, 1 February 2019

LG CM4350 MINI HI-FI SYSTEM - HOW TO UPGRADE THE SOFTWARE, POWER SUPPLY TROUBLESHOOTING – SMPS SCHEMATIC

LG CM4350 Mini Hi-Fi System XBOOM - How to upgrade the software, Power supply troubleshooting – SMPS schematic


LG CM4350,  LG CMS4350F
Hidden key mode

Push both Front key and RCU key to activate it for 5 seconds.
Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : STOP  Check Version and Option code
Front Key : STOP
RCU Key : PLAY/PAUSE
You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.
Clear EEPROM
Front Key : STOP
RCU Key : SKIP-
Edit EEPROM
Front Key : STOP
RCU Key : SKIP+
You can change the digit of option by SKIP+/-.
You can edit 0~f by REPEAT or PLAY/PAUSE key.
Bluetooth DUT
Front Key : STOP
RCU Key : PROGRAM
Bluetooth model only
Power Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : EQ
Amp Clip On/Off
Front Key : STOP
RCU Key : Mute
Amp Clip Mode Change (Amp Clip On > Amp Clip Off > Level Down display)
Service information for EEPROM
> POWER ON 
> FLD no disc status or AUX status.
> Remote control ‘Fwd skip’ + Front ‘STOP’ push same time for about 5 seconds.
> FLD ‘OP-0….
> Move to appropriate position and make changes with remote control ‘skip, mode, play’ key.
> Press the ENTER key.
> FLD ‘write ok.
> Remote control ‘Fwd skip’ + Front ‘STOP’ push same time.
> FLD ‘E2P CLR
Completed.
SMPS Circuit diagram
No power - troubleshooting
If the unit doesn’t work by no power problem, repair the set according to the following
FUSE & BRIDGE DIODE
> Check and replace F901, BD901, TH901 or TH903 on SMPS board.
> Check if the fuse F901 is open or short-circuit.
> Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
> Check if the NTC thermistor TH901 or TH903 is normal or open.
If the unit doesn’t work by no power problem, repair the set according to the following
> Check and replace D951 on SMPS board.
> Check the anode-cathod voltage of D951 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.
> If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
Program download & update
MCS PROGRAM
Download program file name must be - HG520_FW_CM4750_DATE.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
[When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.]
On VFD display screen
> No USB [insert USB device at USB function]
> Search
> Firmware
> Finish
Power off manually [when completed, remove USB device.]
Eq program
Download program file name must be
*CM4350: EQ_PRG_CM4350_***.BIN
*CM4450/CM4550: EQ_PRG_CM4550_***.BIN

*CM4650/CM4750: EQ_PRG_CM4750_***.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
On VFD display screen
> No USB [insert USB device at USB function.]
> Search
> Eq up
> Finish
Power off automatically [when completed, remove USB device]
Posted By: FRANK at 03:36
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