Electronic equipment repair and service manual search discussion :: Topic review - Westinghouse SK-32H240S

M04848 · Posted: Mon Apr 20, 2015 9:25 pm Post subject:

When the TV Set is in its 'breaking picture' mode - while attempting to test CN2002 Pin 10 (Should read 24V) I've got a lil spark from the pin and the set shout down.

I turned the power strip off immediately, waited few minutes, plugged the set on and power it on again -> it turned on in 'breaking picture' mode.

Multimeter is working fine. I did not attempt to take any other readings.

I turned it off, unplugged, waited a lil bit more. Plugged, turned on and so far it works fine again.

Guest · Posted: Mon Apr 20, 2015 8:37 pm Post subject:

DISREGARD my previous reply please ! - It was not thinking clearly

I've got DC 24V and 12V on corresponding pins from power supply while TV is working normally.

As I type - waiting for TV to start breaking the pics and receck the DC Voltage on corresponding pins again.

Problem is that last time that TV was working without any problems all day long....

Time will tell

jts1957 · Posted: Mon Apr 20, 2015 7:26 pm Post subject:

Guest · Posted: Mon Apr 20, 2015 6:35 pm Post subject:

CN2002 Pins 6-10 = 24V connects directly to CN1 on I320B1-16A BOARD BACKLIGHT INVERTER 27-D008101

CN2003 connects directly to CN2001 on Main Motherboard 07278-1 48.71C01.011

where should I see 24V and 12 V, between Neutral from 110V connector and particular pins ?

I assume we are talking about AC ?

Pin7 +5VSB => Stand By Voltage.

Pin 1 = P_ON - power on ?

Don't want to sound "Blond" but need to make sure before I will put my hands on the multimeter and will expect certain measurements.

Thank you again,

jts1957 · Posted: Sun Apr 19, 2015 7:52 pm Post subject:

Left click shop jimmy link;
Left click small picture of the rear/foil side;
Left click now larger picture of the rear/foil side;
Left click RIGHT EDGE near center.

OR

CN2002 Pins 6-10 = 24V
CN2003 Pin 1 = P_ON
Pin 7 = +5VSB
Pins 10-11 = +12V

Guest · Posted: Sun Apr 19, 2015 3:53 pm Post subject:

Cant see specific pin identification.

Also was unsuccessful in finding a service manual - any hints ?

jts1957 · Posted: Wed Apr 15, 2015 10:45 pm Post subject:

http://www.shopjimmy.com/westinghouse-4900253180-power-supply-unit.htm# ,for example, rear view / right edge / at center identifies pinouts of two connectors.

Guest · Posted: Wed Apr 15, 2015 10:26 pm Post subject:

Visual (magnifying eye) and Scent inspection passed.

Can not see any suspicious capacitors, resistors, leaks discoloration etc.

No abnormal (burned) scent/odor from any components either.

I will put it back together, double check all connectors and run the test again tonight.

Connectors Voltage - do you mean board connectors? IN and OUT from particular boards ?

jts1957 · Posted: Wed Apr 15, 2015 10:02 pm Post subject:

You gave three options.

I agreed that it could be any of the three.

Personally, I'd start with a good visual inspection of ALL boards, looking for anything that looks abnormal. Discolored areas or components, loose connectors/wires, leaking or 'puffed' electrolytic capacitors, etc.
If connectors are labeled, compare normal (non-shaking) voltage readings with readings when shaking occurs.

Guest · Posted: Wed Apr 15, 2015 8:54 pm Post subject:

jts1957 - Thank you for prompt reply, I really appreciate it

Just to double check - Only The Inverter is what I should changed? is that correct ?

Thank you,