DOWNLOAD LG 42PC3RA-ZJ (CHASSIS:PP61A) Service Manual ↓ Size: 16.91 MB | Pages: 52 in PDF or view online for FREE

- 21 -

Start check

Manufacture enterprise

meaning of a passage

1. Check the Power Off

condition.

Doesn't the 

screen whole come

out?

Is it identical 

with Power Off

condition?

Yes

Yes

No

No

No

No

No

2. Check the Interface

signal condition.

Is the Interface 

signal operated?

Yes

3. Check the St-by 5V

signal circuit.

Doesn't the 

low pressure output

come out?

Doesn't the 

St-by 5V signal 

come out?

Yes

Yes

No

4. Check the 5V Monitor

signal circuit.

Doesn't the 

5V Monitor signal 

come out?

Yes

7. Check the VSC Vs-ON

signal 

Doesn't the 

high tension output

come out?

Doesn't the 

VSC signal Vs-ON

come out?

Yes

Yes

Does

high tension 

output voltage Drop

occur?

When the

Y B/D Module

input connector is

removed, does output

voltage drop

occur?

When the

Y, Z B/D Module

input connector is remove,

does Power Board hightension 

output voltage Drop

occur?

Yes

No

No

9. Check the Power

Board Output high

tension circuit

Yes

10. Check the Z B/D

Module output circuit

Yes

When the

Z B/D Module 

input connector is

removed, does output

voltage Drop 

occurs?

11. Check the Y B/D

Module output circuit

Yes

No

8. Check the Vs, Va

voltage output circuit.

Doesn't the 

Vs, Va voltage output

come out?

Yes

No

No

5. Check the VSC RL-ON

signal.

Doesn't the 

VSC signal RL-ON

come out?

Yes

6. Check the VSC low

pressure output

Doesn't the 

VSC low pressure

output come out?

Yes

- 22 -

T801: Vs Trans

T901: Va Trans

T112: Low Voltage Trans

T501: ST-BY Trans

T601: PFC Inductor

- 23 -

1) Front LED is NO light.
2) The Set doesn’t discharge little.

Is plug in power cord?

Plug in power cord.

Yes

No

Is the Line Filter Cable to PSU

connected?

Connect the Cable.

Yes

No

Is the Fuse(F101) on

PSU normal?

Exchange the Fuse.

Yes

No

Is the PSU and Main Board with

13P Cable connected?

Connect a 13p Cable.

Yes

No

After the cable connect is removed
to Power Board(except the EL11
connection cable), the AC voltage
marking is authorized on manual.
When ST-BY 5V is not operated,
replace PSU.

- 24 -

1) Front LED is Red, but doesn’t cahge Green.

(Cannot turn on the SET)

2) Don’t operate power on using a Remocon or Local key. 

Yes

Is connect the IR board, Local key, and main board 

with 10p and 4pin cable?

Pull off the power cord and wait until discharge entirely

(you can watch the LED on a main board through  

a Back cover. If LED is off, a discharge is finished) 

Then plug in the power cord again. Has it still a problem?

Is normal the Main board?

( Check voltages of  P900 in main board )

Yes

No

Is normal the IR board and Local key?

Exchange the IR and Local key.

Exchange the Main board

Connect cables.

Yes

No

No