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 !

Wednesday 13 March 2019

LG 32LCR TROUBLE SHOOTING - NO POWER - NO PICTURE - NO SOUND

LG 32LCR TROUBLE SHOOTING - NO POWER - NO PICTURE - NO SOUND




TROUBLE SHOOTING

No power

Symptom

1) Front LED is No light

2) The Set doesn’t discharge little
 Check process

Is plug in power cord?
NO
Plug in a power cord
YES

Check P200 Voltage (P-ST_5V)?
NO
Check the PSU
YES

Check X-tal X600 (19.6608MHz)
NO
Check X-tal X600
YES

Check IC600 Voltage (3.3V)
NO
Check IC600
YES

Check Power on/off (5V)
NO
Check Q901
YES

Exchange the PSU





 No picture

Symptom

1) Some mode doesn’t display.

2) Front LED is green

3) The set still discharge a little

Check follow

1) RF-mode doesn't display

Is the LVDS cable
connected?
YES
Is the Tuner cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Are input voltage, I2C,
and CVBS output
good in Tuner?
YES
Is VCT-P IC good?
NO

NO

NO

NO

NO
Insert the LVDS
cable exactly

Insert the Tuner
cable exactly

If it dead or short,
exchange this
elements

Exchange the Tuner

Exchange the VCTP IC


2) AV/Component-mode doesn’t display

Is the LVDS cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Is VCT-P IC good?
NO

NO

NO
Insert the LVDS
cable exactly

If it dead or short,
exchange this
elements

Exchange the VCTP IC







3) RGB/HDMI-mode doesn't display

Is the LVDS cable
connected?
YES
Are good some
elements(C, R, L, or
Diode) at path?
YES
Check the EDID
data
YES
Is AD9381 good?
(only _ HDMI)
YES
Is VCT-P IC good?
NO

NO

NO

NO

NO
Insert the LVDS
cable exactly

If it dead or short,
exchange this
elements

Download the EDID
data

Exchange AD9381
IC

Exchange the VCTP IC



No Sound

Symptom

1) Front LED is Green

2) The Set display a screen, but a sound doesn’t output

Check follow

1) Speaker part

Are Speaker Cables
Good?
YES
Are Speaker Cables
connect normally?
YES
Are Speaker units
good?
NO

NO

NO
Exchange the cable

Insert the cable
exactly

Exchange the
Speaker unit

2) Main board part

Is sound at HDMI
Good?
YES
Is EDID download
good?
YES
Is IC401 good?
(AD9381)


NO

NO


Download EDID
data once more

Exchange IC401

Is sound at
Scart1/2 (or
Component2)RGB,
or Side AV Good?
YES
Are good some
elements (C, R, L,
or Diode) at Sound
path
YES
Is IC800 good?
(Switching IC)
YES
Is IC601 good?
(VCT-P)
YES
Is IC801 good?
(Amplifier)


NO

NO

NO

NO


If it dead or short,
exchange this
elements

Exchange IC800

Exchange IC601

Exchange IC801