LCD42V88P Manual/Schematic

[adlui]

Hi!
I'm looking for manual of LCD42V88P board( RASG7.820.2240) and Power board is RASG&.820.1673.

Symptoms:
- When switched-on, power led turns red,after few seconds, it will blink 5 times then off.
- has complete supply voltage on power board socket XP803 and XP805, except STB pin=2.5vdc.

Any help will very much appreciated.

[budm]

Re: LCD42V88P Manual/Schematic

If you upload good clear straight shot pictures of the top and bottom side of the power supply, and the the pictures of the whole back side of the TV showing all the board; that will help troubleshooting the problems.

[nomoresonys]

Re: LCD42V88P Manual/Schematic

https://elektrotanya.com/?q=showresult put model number in, might have one.

[adlui]

Re: LCD42V88P Manual/Schematic

@budm:
https://www.4shared.com/photo/u0dklj...22_104018.html
https://www.4shared.com/photo/d6Gwuq...22_104052.html
https://www.4shared.com/photo/kTpG1R...22_104105.html
https://www.4shared.com/photo/7zdHK4...22_104117.html

@nomoresonys:
Thanks. I'll try that link.

Ooppps.. by the way, this is DEVANT 42CL900.

[budm]

Re: LCD42V88P Manual/Schematic

So your power board is 'RASG7.820.1673', right? I cannot see it from the pictures.
Not 'RASG&.820.1673'.
Are there label for each pin of the connector? They may have label on the bottom side of the board so we do need the pictures of the bottom side of the board too, the more details you give us the better we can help you since we do not have the TV in front of us to look at.

[budm]

Re: LCD42V88P Manual/Schematic

This looks to be your power supply board:
http://www.shopjimmy.com/dynex-122904-power-supply.htm#
Dynex 122904 (RSAG7.820.1673/ROH, 122906) Power Supply Unit
If it is then I may be able to use the pictures from shopjimmy.
Pictures provided by shopjimmy.

I cannot read all the pin names on your board or SJ board so you need to provide us those names.
BTW, it looks like SJ board is not the exact match, connector XP803 is not the same as yours.
The SJ board only has switched 16V on XP803 .
Connector XP805 pins are:
???
???
???

[adlui]

Re: LCD42V88P Manual/Schematic

This looks to be your power supply board:
http://www.shopjimmy.com/dynex-122904-power-supply.htm#
Dynex 122904 (RSAG7.820.1673/ROH, 122906) Power Supply Unit
If it is then I may be able to use the pictures from shopjimmy.
Pictures provided by shopjimmy.

I cannot read all the pin names on your board or SJ board so you need to provide us those names.

Yes..that's correct. 1673..it's just typo-error on rsag7
Pics
https://www.4shared.com/photo/GiJgS-...2_1128241.html
https://www.4shared.com/photo/MFTyyD...2_1128541.html
https://www.4shared.com/photo/6G0DsZ...2_1129201.html

https://www.4shared.com/photo/wf4a1z...22_112920.html

[adlui]

Re: LCD42V88P Manual/Schematic

This looks to be your power supply board:
http://www.shopjimmy.com/dynex-122904-power-supply.htm#
Dynex 122904 (RSAG7.820.1673/ROH, 122906) Power Supply Unit
If it is then I may be able to use the pictures from shopjimmy.
Pictures provided by shopjimmy.

I cannot read all the pin names on your board or SJ board so you need to provide us those names.
BTW, it looks like SJ board is not the exact match, connector XP803 is not the same as yours.
The SJ board only has switched 16V on XP803 .
Connector XP805 pins are:
???
???
???

hmmnn.
SJ has ver E, mine was ver F

[adlui]

Re: LCD42V88P Manual/Schematic

Update.

Lift STB pin, voltage becomes 5v( 2.5v when connected.) and Standby LED remains On now(normal standby).
STB voltage is always on. No response from POWER "touch" button.

[budm]

Re: LCD42V88P Manual/Schematic

STB pin is the control signal pin, it is the same as PS-ON, in your case this will turn on the power relay (right next to C848) so the switched 24V , 16V, etc, will run. 2.5V = Main power supply ON, <1V = Main power supply OFF.
5V_S is the 5V Standby power supply to run the main board and it must be working otherwise you will not have 2.5V at the STB (PS-ON) pin to turn on the power supply. Verify that you do have 5V at 5V_S pins.
So do you hear the power relay click sound when power switch is activated?

[adlui]

Re: LCD42V88P Manual/Schematic

Yes, relay clicked when main switch turned-on and has 24v, 16v,12v,etc... STB 2.5V but, touching power button, it didn't turn to 0v.

[budm]

Re: LCD42V88P Manual/Schematic

Yes, relay clicked when main switch turned-on and has 24v, 16v,12v,etc... STB 2.5V but, touching power button, it didn't turn to 0v.

So at this moment the TV is stuck on since the main relay is on and getting all those Voltages. Can you use your remote to turn the TV on and OFF?
Does the 24V/16V/12V goes away when power switch is toggle on and off?
Do you have backlights at this point?

[adlui]

Re: LCD42V88P Manual/Schematic

So at this moment the TV is stuck on since the main relay is on and getting all those Voltages. Can you use your remote to turn the TV on and OFF?
Does the 24V/16V/12V goes away when power switch is toggle on and off?
Do you have backlights at this point?

Yes, the TV is On but there's no display or indication that the system is completely boot-up.
24v/16/12v goes off because there's only main power switch option to turn on and off.
-Unfortunately no available remote control.
Sometimes after repeatedly toggle ON/OFF switch, just a dimmed backlight.

[budm]

Re: LCD42V88P Manual/Schematic

If the PS-ON is stuck on then you have problem in the main board some where, but the BL-ON signal is present otherwise you will not get any backlights at all, so is the BL-ON signal stuck high too then?

[adlui]

Re: LCD42V88P Manual/Schematic

If the PS-ON is stuck on then you have problem in the main board some where, but the BL-ON signal is present otherwise you will not get any backlights at all, so is the BL-ON signal stuck high too then?

Yes, PS ON is always "high" right after main power switch is ON.

BL-ON signal was intermittent associated in switching main power switch..
There are times, when main power switch turned-on, it has "high" signal, sometimes no signal.

[adlui]

Re: LCD42V88P Manual/Schematic

up..

[nomoresonys]

Re: LCD42V88P Manual/Schematic

Wonder if the firmware on mainboard is corrupt.

[adlui]

Re: LCD42V88P Manual/Schematic

Wonder if the firmware on mainboard is corrupt.

I think you've got it right. That's another thing I will try.
But, I can't find eeprom file for this board.

[nomoresonys]

Re: LCD42V88P Manual/Schematic

https://devanttv.com/products/
Do you see your model there? maybe hit the contact there, email or call see if they have the firmware available.

[adlui]

Re: LCD42V88P Manual/Schematic

Thank you.

I can't see 42LC900 model on their list but I'll try to contact them if they can provide fw file.