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 27 March 2019

LG 42PG 60UD _ POWER BOARD TROUBLESHOOTING GUIDE

LG 42PG 60UD _ POWER BOARD TROUBLESHOOTING GUIDE




NO POWER ON

Start check













Doesn't the
screen whole come out?
Yes
Is it identical
with Power Off condition?
No
Is the  Interface
signal operated?




Yes

Yes


No

1. Check the Power Off
condition.

2. Check the Interface
signal condition.



Doesn't the
low pressure output come out?
Yes
Doesn't the
St-by 5V signal come out?
No
Doesn't the
5V Monitor signal come out?
No
Doesn't the
VSC signal RL-ON come out?


Yes

Yes

Yes

No

3. Check the St-by 5V signal circuit.

4. Check the 5V Monitor
signal circuit.


5. Check the VSC RL-ON
signal.
Doesn't the
high tension output come out?
Yes
Doesn't the
VSC signal Vs-ON come out?
 No
Doesn't the
Vs, Va voltage output
come out?





Yes

Yes


No

7. Check the VSC Vs-ON
signal

8. Check the Vs, Va
voltage output circuit.



Does high tension output voltage Drop occur?





No
Manufacture enterprise
meaning of a passage.
Yes
When the
Y, Z B/D Module input connector is remove, does Power Board hightension
output voltage Drop occur?

Yes
9. Check the Power Board Output high
tension circuit
No
When the
Y B/D Module
input  connector is
removed, does output
voltage drop
occur?

Yes
10. Check the Z B/D Module output circuit

No
When the
Z B/D Module
input  connector is
removed, does output
voltage Drop
occurs?

Yes
11. Check the Y B/D Module output circuit