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LCD-TV Power Unit Troubleshooting

This document provides troubleshooting instructions for power PCB assemblies in LCD TV models. It includes: 1) A diagram identifying checking points on the power unit including connectors and voltages. 2) A process flow chart outlining steps to check voltages, resistance, and signal levels at different points to isolate issues. 3) Product and part number information for the power PCB assembly.

Uploaded by

Ranjani Rangarajan
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5K views2 pages

LCD-TV Power Unit Troubleshooting

This document provides troubleshooting instructions for power PCB assemblies in LCD TV models. It includes: 1) A diagram identifying checking points on the power unit including connectors and voltages. 2) A process flow chart outlining steps to check voltages, resistance, and signal levels at different points to isolate issues. 3) Product and part number information for the power PCB assembly.

Uploaded by

Ranjani Rangarajan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Service Instruction

File No.: 06C-201235


Date: 1 Nov. 2012
Rank : C

Subject : Trouble shooting for Power PCB Assy

Product : LCD-TV
Model : 24PB1E 24PB1T 24PB1V 24PB1E1 24PB1V1
24PB1E4 24PB1E6 24PB1V6
24PB10E 24PB10E1 24PB10V1 24PB10E4 24PB10E6
24PB10V6

Part No : 75021913
Description : PC BOARD ASSY, POWER UNIT, PSIV750401A

1) Circuit Checking Point


< Fig.1 > Power unit ②DM851 Cathord
①Connector
Pin No. #15
③JP120

Parts No. CN803


Pin No Symbol Description
Pin No. #1
15 STATUS Inverter Error Status

14 NC NC

13 EX DIM External PWM Signal

⑥ 12 BL ON BL On/Off Signal

11 GND GND

⑤ 10 AC_DETECT AC Detect Singal

④ 9 POWER_TV Remote On/Off

8 GND GND

7 5V +5V DC Output

6 5V +5V DC Output

5 GND GND

4 5V(T-CON) +5V DC Output

3 13V +13V DC Output

2 13V(AUDIO) +13V AUDIO Output

1 GND GND
2) Checking Process flow

No power / Backlight is not lighting

Insertion check of connectors No


⇒ OK ? Re-insertion of connectors
(Check point ①)

Yes
No It operates normally.

Check the 5V voltage


Y
No
⇒ 4.8 ～ 5.4V ?
(Check point ②) Finish

Yes No
Check the 5V line resistance
⇒ More than 500Ω ? Check main
(Check point ② )

Yes

Replace with New Power unit

Check the 13V voltage


No
⇒ 12.3 ～ 13.2V ?
(Check point ③)

Yes No
Check the signal level of Power-TV
Check main
⇒ 4.8 ～ 5.4?
(Check point ④ )

Yes

Replace with New Power unit

Check the signal level of AC_DETECT


No
Replace to New Power unit
⇒ 3.0 ～ 3.6V ?

Yes

Check the signal level of BL_ON No


Check main
⇒ 3.0 ～ 3.6V ?
(Check point ⑥)

Yes

Replace with New Power unit

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