samsung BN44-00599A PWB

[ajshoe]

Have a Samsung plasma PN51F4500AF with no signs of life. no +5.3V when plug in and Main board disconnected. does anybody have schematic for this PWB ? Q4000, Q4002, Q4003, Q4004, and fuses are ok

[R_J]

Re: samsung BN44-00599A PWB

Check the connections on ICB801S, this should be the standby ic, If the connections are bad and resoldering doesn't fix it, the ic is likely bad.
The ic is on the heat sink next to the bridge rectifier BD801S

[R_J]

Re: samsung BN44-00599A PWB

There should be a resistor, RB807 (0.3Ω) off pin2 of the ic, remove one end and check if it is open, if it is open the ic is likely shorted, also check DB804 diode which is also off pin2 to hot ground

[ajshoe]

Re: samsung BN44-00599A PWB

bench test, 165 VDC across big cap, ICB801S is good, have standby power, +5V, main board fuse is good, power button does nothing. no signs of life - no leds on. can this tv be forced on (bypass main board) ?

[lotas]

Re: samsung BN44-00599A PWB

bench test, 165 VDC across big cap, ICB801S is good, have standby power, +5V, main board fuse is good, power button does nothing. no signs of life - no leds on. can this tv be forced on (bypass main board) ?

It will not work forcibly, since the logic is soldered on the main board.

[R_J]

Re: samsung BN44-00599A PWB

bench test, 165 VDC across big cap, ICB801S is good, have standby power, +5V, main board fuse is good, power button does nothing. no signs of life - no leds on. can this tv be forced on (bypass main board) ?

I thought you had no standby 5 volts according to your first post.
Check the PS_ON pin on CN4007 when the power button is pressed, does this voltage change? if not the problem is likely on the main board.
The main board contains the control board as well so the tv can't be forced on without it.
It may be a faulty eeprom, corrupt data. shopjimmy has them available

[ajshoe]

Re: samsung BN44-00599A PWB

when I first measured it - I read 0 volts (maybe had wrong pin). took PWB off and looked at it - re-soldered 20 cold solder joints - they looked suspicious but not real bad. re-installed board and have standby power.
power plug in - all pins on CN4007 are 0 volts except pin 14 (standby) - 5.2 Volts and
pin 15 (PS_ON) - 3.7 Volts. pressing power button does nothing. no change.
ordered a used main board.

[ajshoe]

Re: samsung BN44-00599A PWB

really stinks that you can't force newer plasma sets on. assume main bd is dead - replace it and if buffers or sustain bd are dead you've wasted $$ and time. seems like newer plasmas are not worth the time

[ajshoe]

Re: samsung BN44-00599A PWB

got EBAY main board - no change. anybody have schematic for this set ? whats proper procedure for turning this set on ? simple press of button or hold it for 3 seconds ? Have no lights whatsoever no matter how you press button (joystick button)

[lotas]

Re: samsung BN44-00599A PWB

The LED is blinking, does it give any error?

[ajshoe]

Re: samsung BN44-00599A PWB

no led on main board.
OK - just figured out how to run test patterns. jumpered 3-4 and jumpered PS_ON to ground. PWB came alive and test patterns on screen appeared ! I must have got a bad main board or joy stick button apparatus is bad. I checked connector CN1201 on main board (joystick button) and couple pins had 13 Mvolts most had 0 volts
Led flashes about 1 sec interval with PS_ON jumpered

Is there a way to test joystick button ?

[lotas]

Re: samsung BN44-00599A PWB

Do you have a remote control?
Here are the error codes.

[ajshoe]

Re: samsung BN44-00599A PWB

what good are the error codes when the led on main just flashes evenly about every second when PS_ON is jumpered ? The led on main board is off when PS_ON is not jumpered

[lotas]

Re: samsung BN44-00599A PWB

I gave you error codes just in case, it may come in handy later.

[lotas]

Re: samsung BN44-00599A PWB

Here is the pinout of the joystick, but from the PNXXF5500 series. Not like that with you?

[tvtimmy]

Re: samsung BN44-00599A PWB

If your tv stays on with the test patterns running, your mainboard is bad. Period. Replace it and everything will be good.

[ajshoe]

Re: samsung BN44-00599A PWB

that is the same joystick button. checked all pins on that connector - no 3.3 volts on any pins. does anybody know the voltages for the connector ?
I made an assumption that the main board was the problem. Ordered one EBAY - it does the same thing - NOTHING.
I downloaded a samsung tech sheet - basically said main boards for this tv were produced with a bad chip. tech sheet said to replace main bd and download new software.

[R_J]

Re: samsung BN44-00599A PWB

that is the same joystick button. checked all pins on that connector - no 3.3 volts on any pins. does anybody know the voltages for the connector ?
I made an assumption that the main board was the problem. Ordered one EBAY - it does the same thing - NOTHING.
I downloaded a samsung tech sheet - basically said main boards for this tv were produced with a bad chip. tech sheet said to replace main bd and download new software.

Was your set manufactured before March 2013?

There should be A3.3v on one of the pins, you are aware that there are two rows of pins on that connector. The voltages are located on the legend and test points to the right of the connector.

[ajshoe]

Re: samsung BN44-00599A PWB

NOV, 2013
I'll check voltages again tomorrow with joystick connected and disconnected there is only one row of pins - 7 pins. also there is no legend or voltages marked on the main board near the connector

[R_J]

Re: samsung BN44-00599A PWB

Nov 2013 is mfg'ed AFTER march so the bulletin does not apply to this mainboard.
Here is the legend and the rear of the main board showing the two rows of pins and where they connect to the test points.

The joystick has 8 wires and connects to one of the two rows of pins on cn1202 on the main board.
If it is the bottom row, the 2'nd pin should have A3,3v. if it is the top row, the 6th pin should have A5v