Hello everyone,i've bought a defective P50G11B and was hoping to repair,i very much regret that decision now.This tv came from the depths of hell.
The previous owner apparently didn't mess with it,he took it to an repair shop to see what was broken,diagnosed A board.
When the TV got here it was blinking once every 3 seconds,i knew that meant "unknown error" or 5V standby missing,only A board plugged,all the P-board voltages were there,when i checked the A-board P25,all the pins were measuring 0V! I wasted some time before i discovered that of course,it was a damaged connector,ripped it off and soldered each and every wire directly into the board,it looks horrible but then green led and A-board was working,one of the fans was dead,i bypassed it with soldering the PWM wire to the other one and a 220 OHMs resistor between + and -,the power supply also had a bulging 220V 1200uF capacitor(VSUS),had to buy and replace that.
THEN when i connected everything and went to power up,loud buzz from the power supply,7 blinks,damn,SC-board,i took it out and found a shorted "2PG011" that was linked to VSUS,replaced with a weaker 30F124(should work),7 blinks again,found a shorted SMD diode,replaced,pushed the power button and BANG a poor IC exploded,M81707FP,inspected the board again,only to find 9 IGBTs and 4 drivers shorted,i just bought another board because there's no repair kits selling around here,it would be more expensive to buy the IGBTs than a new board.
New SC board came in,still 7 blinks,i was very upset to say the least.
Unplugged SD,6 blinks,was almost to the point of buying a SD+SU when i decided to unplug the lower C-board connector from A-board,then solid green led,but of course no display.
Plugged in C-board flat cable and it is displaying "8 blinks",now SS board?My patience was running out as i spent 10 hours fidgeting with that board,measured every resistor,replaced a M81707FP that seemed burnt,1 IGBT(45F127) and 2 driver ICs for that transistor,i think that it's killing the collector driver everytime i power up,because on diode mode between gate and collector there is no measuring,while on others on the board there is.
All that said,when TV turns on there is a quick buzz from the SS-board inductors,with the board disconnected from the panel or not doesn't matter,all the needed voltages(ve,tpSS1) appear for about 3 seconds then it disarms and slowly decreases,when the panel is connected tpSS1 jumps to 90V for miliseconds,does a crazy swing that my multimeter can't catch fast enough,drop to 37V and shuts down,VE goes to 135.6V(as the panel specifies) and shut down after 3 seconds too,VSUS,Ve and Vdat matches panel label(198V/135V/60V).
A-board,P-Board capacitor,a fan,SC board,SS board,so many problems.
Something i fear is a bad panel,shined a flashling and inspected it caurefully,nothing wrong,tried to power on horizontal or vertical,no difference.
I'm using the P50G10B service manual,all is identical except for the main board layout.
Just what is with this?someone can help me with the SS board?don't wanna just buy another one i've spent already half of what a working P50G11B is worth.
The previous owner apparently didn't mess with it,he took it to an repair shop to see what was broken,diagnosed A board.
When the TV got here it was blinking once every 3 seconds,i knew that meant "unknown error" or 5V standby missing,only A board plugged,all the P-board voltages were there,when i checked the A-board P25,all the pins were measuring 0V! I wasted some time before i discovered that of course,it was a damaged connector,ripped it off and soldered each and every wire directly into the board,it looks horrible but then green led and A-board was working,one of the fans was dead,i bypassed it with soldering the PWM wire to the other one and a 220 OHMs resistor between + and -,the power supply also had a bulging 220V 1200uF capacitor(VSUS),had to buy and replace that.
THEN when i connected everything and went to power up,loud buzz from the power supply,7 blinks,damn,SC-board,i took it out and found a shorted "2PG011" that was linked to VSUS,replaced with a weaker 30F124(should work),7 blinks again,found a shorted SMD diode,replaced,pushed the power button and BANG a poor IC exploded,M81707FP,inspected the board again,only to find 9 IGBTs and 4 drivers shorted,i just bought another board because there's no repair kits selling around here,it would be more expensive to buy the IGBTs than a new board.
New SC board came in,still 7 blinks,i was very upset to say the least.
Unplugged SD,6 blinks,was almost to the point of buying a SD+SU when i decided to unplug the lower C-board connector from A-board,then solid green led,but of course no display.
Plugged in C-board flat cable and it is displaying "8 blinks",now SS board?My patience was running out as i spent 10 hours fidgeting with that board,measured every resistor,replaced a M81707FP that seemed burnt,1 IGBT(45F127) and 2 driver ICs for that transistor,i think that it's killing the collector driver everytime i power up,because on diode mode between gate and collector there is no measuring,while on others on the board there is.
All that said,when TV turns on there is a quick buzz from the SS-board inductors,with the board disconnected from the panel or not doesn't matter,all the needed voltages(ve,tpSS1) appear for about 3 seconds then it disarms and slowly decreases,when the panel is connected tpSS1 jumps to 90V for miliseconds,does a crazy swing that my multimeter can't catch fast enough,drop to 37V and shuts down,VE goes to 135.6V(as the panel specifies) and shut down after 3 seconds too,VSUS,Ve and Vdat matches panel label(198V/135V/60V).
A-board,P-Board capacitor,a fan,SC board,SS board,so many problems.
Something i fear is a bad panel,shined a flashling and inspected it caurefully,nothing wrong,tried to power on horizontal or vertical,no difference.
I'm using the P50G10B service manual,all is identical except for the main board layout.
Just what is with this?someone can help me with the SS board?don't wanna just buy another one i've spent already half of what a working P50G11B is worth.
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