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Westinghouse 32 LCD TV.... will not turn on. No apparent means

 
 
 

Customer Question

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Westinghouse 32" LCD TV.... will not turn on. No apparent means to reset nor did I find and fuses (internally or externally). Unit is getting 120VAC and power board is converting to 5VDC (verified). Any ideas?

Submitted: 989 days and 19 hours ago.
Category: Consumer Electronics
Status: CLOSED
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Optional Information

Make: Westinghouse
Model: SK-32H540S

Already Tried:
Confirmed power converting is working (able to read 5VDC on multiple leads supplying main board). Unit will not turn on with remote or power switch on TV.

 
 
 
 
 
 
Posted by euro-pro llc 989 days and 10 hours ago.

Expert's Answer

Hi,

I will be happy to assist you with this question.

I understand that you have the STB 5V going into the main board.

This is all the main board needs to function at this point.

Now,please push the power button and monitor with the meter on Vdc,the power on command from the main board into the power board.This should be a pin on the power board connector,that should go to about 3-5V when power button is pushed,

This command is supposed to wake up the power supply ,and this should generate the other switched voltages.

My suspicion is that the main board is defective and will not generate this power on command.

The part# XXXXX this board is:

55.70F01.E01G

Unfortunately it is very hard to find,there is a very low availability for it.

If the Power On command is coming into the power board ,but still no output voltages from the power supply=defective power board.

Part # XXXXX this is:

56.04073.011

A good place to start looking for parts is :

partstore.com

andrewselectronics.com

I hope this helps,

Please leave a positive feedback if you feel I did my best to answer your question.It will be highly appreciated.

Thank you and have a good night!

 
 
 
 
 
 
988 days and 13 hours ago.

Customer Reply

The readings from the power board connections are as follows (relative to GND):

 

NC - empty pin

NC - empty pin

GND - empty pin

V_IPWM - 2.84 VDC

BL_ON - 0.02 VDC

PS_ON - 2.80 VDC

GND - 0 VDC

GND - 0 VDC

5V - 4.96 VDC

5V - 4.96 VDC

5V - 4.96 VDC

5VS - 4.96 VDC

GND - 0 VDC

GND - 0 VDC

12.5V - 11.99 VDC

12.5 V - 11.99 VDC

 

NONE of these readings changed when I pushed the power on button.

 

When I disconnected the main board all of these pins read 0 VDC except the "5VS" pin, which read 5.00 VDC.

 

I did find the main board available from one source. just want to confirm that based upon this information you still believe the main board is the problem before I order it and accept your answer.

 

Thank you in advance.

 
 
 
 
 
 
988 days and 13 hours ago.

Customer Reply

Just want to make sure you got my follow-up question... unclear if there was a problem when I sent it.

 
 
 
 
 
 

Accepted Answer

Hi,

Good job with the voltage readings!

You are perfectly right-the tv needs replaced the main board.

The way it was supposed to act,if was a good one ,is ,once you push the power button,and only then-the PSON should change from 0V to round 3V,then couple seconds after this,the BLON should get also "high" between 3V and 5V.

Since your PSON is always 2.8V and BLON is 0V=defective main board.

I hope this helps,

Thank you

Picture
Expert: euro-pro llc
Pos. Feedback: 98.5 %
Accepts: 506
Answered: 9/9/2009

Technician

20 years experience

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