Toshiba 40RV525R repair (schematics?)

[juicer]

No video and can't check audio without video to switch between inputs.
TV was gifted with "if you fix it, it's yours"
Followed Toshiba Smart Flow and it seems to point to syscon on main board
Power supply 01-PK101V10001 shows following readouts
Pin readouts on PS at P802 expected and (actual)
1. Gnd
2. Gnd
3. 24V Aud> (no reading)
4. 24V Aud> (no reading)
5. Gnd
6. Gnd
7. Gnd
8. 12 V> (no reading)
9. 12V (Panel Pwr.)> (no reading)
10. 5V>** (no wire in connector but 5V without connector in place) ** indicates standby
11. 5V>** (5V)
12. 5V>** (5V)
13. Pwr. On (Enable) 4.0V< (.07)
14. AC Det (PWR Good) .07V> (5 V without connector - .04V with connector)
15. Dim 1.3 to 3.3V< (.02V)
16. BL On 5V< (.01V)
Notably, when I disconnect pwr board from main board and inverter, and short pin #13 to 5V the readings expected as 24V is only 16V and expected 12V is only around 7V.
If syscon on main board were the issue, I still have the problem with reduced 24 and 12V even without the main.
I can't find any schematics for the boards.
I have limited skills and a voltmeter and a brain if any of that helps.

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

With power supply forced on what dc voltage are you getting across main cap?

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

attached is pic of power board
which of the big caps are you referring to?

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

The two big ones. Measure across terminals. Don't touch with bare hands they can be lethal

[frank_b45]

Re: Toshiba 40RV525R repair (schematics?)

I think these are schematics for this set, not 100 % sure.

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

The two big ones. Measure across terminals. Don't touch with bare hands they can be lethal

I only have a voltmeter.
What setting would I use and what readings would I expect?

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

Capacitor rating is 220v so around 200vdc

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

165vdc on each capacitor

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

Well I don't think this supply has pfc. Someone else will have to jump in as I am learning myself. Only thing I know is your 5v is ok and coming off the small transformer. Your 12 and 24v are low and they come off the big transformer. So something in the driver circuit or ic U101 is probably out of tolerance

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

https://www.badcaps.net/forum/showthread.php?t=19073
according to post #10 in a related link above, there is no pfc on this board??
so what is my next step if any?

[dick_barton]

Re: Toshiba 40RV525R repair (schematics?)

With the black meter probe on the negative leg of C102 and positive probe on the positive leg of C101 what DC voltage do you have.
What are the voltages around U101 and what part number is it.

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

U101 is probably on back of board

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

With the black meter probe on the negative leg of C102 and positive probe on the positive leg of C101 what DC voltage do you have.
Voltmeter set on 200V DC reading is 1
What are the voltages around U101 and what part number is it.

picture attached of back of board and U101 area. I'm not sure where to measure.

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

Set voltmeter higher. Part number of ic U101

[dick_barton]

Re: Toshiba 40RV525R repair (schematics?)

Voltmeter set on 200V DC reading is 1

Set the voltmeter to the next highest range since 1 = over-range.

What is the part number written on top of U101

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

Set the voltmeter to the next highest range since 1 = over-range.
332dcv

What is the part number written on top of U101

SS59502S
hard to read but this is the top line
underneath is SK913
then 183T

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

I find nothing for that part number. And I am no good reading schematics.

[dick_barton]

Re: Toshiba 40RV525R repair (schematics?)

The 332V looks fine but like dskall I cannot find anything under the part number given.

[juicer]

Re: Toshiba 40RV525R repair (schematics?)

Took another look, difficult to read but looks like the part # SSC9502S and compared to Google images

[dskall]

Re: Toshiba 40RV525R repair (schematics?)

http://www.datasheetspdf.com/PDF/SSC9502S/735771/6
Power supply schematic doesn't seem to match up