Question about Princeton Digital LCD17 17" Flat Panel LCD Monitor

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Power up problem

I am an engineer and have traced the problem to a driver on the small high voltage circuit board. Where can I get the board which is a SAMPO QPWBGl9931DLD. The components are not labeled so replacing the driver would be impracticle. I hate to fill our landfils and would like to save it. Gary

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  • HonkityHank Sep 18, 2007

    I have ordered the replacement card. I feel sure the individual driver (transistor) would be hard the obtain since it is not marked with a part number or else I would have ordered it a a fraction of the cost.

    Thanks for the Info on the supplier. I was unable to locate it myself.




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Posted on Sep 18, 2007


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Posted on Jan 02, 2017


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LG 42LN5300 TV has No video no menu. back-light on sound on. Replaced T-con board problem persists.

The input board (T-con) was probably not the problem. Check the high voltage circuit on the power board first. After 120 volts enters the TV, it goes to a high voltage transformer and a capacitor there is where you can the high voltage - should be as close to 400 volts DC as possible. (380 volts is a failed high voltage circuit.) The video card is next, check those small capacitors. Good luck.

Jan 05, 2018 | LG Televison & Video

1 Answer

Samsung tv model LN52a550p3fxza turns on and off repeatedly. Before this happening it would turn on but screen was pinkish. What part do i need to replace so it will turn on?

Before replacing the power board, check the small high voltage transformer and the high voltage circuit. From the 120 volts AC, trace the fuse, then the capacitor on the other side of the transformer for at least 390 volts DC. The input (control) board has a chip that checks all the circuits including this voltage. The capacitor is 100 uf rated at 450 volts. If the high voltage is not at least 390 volts, then replace this capacitor with a larger one 350 uf rated at lest 400 volts. And see what happens. Good luck.

Dec 27, 2017 | Samsung Televison & Video

1 Answer

I have much Samsung TV that turns on but turns off after cycling picture has lines up and down and a loud high pitch noise comes out

The TV has a chip that check to see if the circuits are OK before turning on the set. Samsung has a power, input and video boards. The problem is when it check the high voltage circuit and it does not have 390 volts, the chip turn-off the power instead. You can buy a new power board or fix it yourself. The power board is where the 120 volts AC is plugged in, and near the 120 volts is small transformer, then you will see a capacitor rated 100 uf at 450 volts. Check for 390 volts here. If the voltage is less, then replace this capacitor with a 350 uf at 400 or at 450 volts.Samsung used a "small" capacitor when it should have ordered at large capacitor. Good luck.

Nov 28, 2017 | Samsung Televison & Video

1 Answer

Thermostat is new but no 24 vac at contactor

If you are handy with meters and electrical work try this.
Somewhere there is a small transformer that supplies the 24volts.
If you trace the wires from the contactor coil back to the big circuit board then the transformer is probably on that board. Make sure you are tracing the COIL wires. If the wires go to a small transformer mounted separately then your in luck. That transformer steps down the voltage to 24 volts used as a "control" voltage for the unit. If you have 24vac output at the transformer, and no 24vac at the contactor then a control or thermostat circuit is open.

Jul 11, 2012 | American Standard Heating & Cooling

1 Answer

Rudd furnace>>>> power surge.

Some circuit boards have a built in transformer and others have the transformer that sits right beside the board depending on the age of the furnace. First, look for a small 3 or 5 amp fuse on the circuit board. Check it, and if its good, and you have a small ohm/volt meter. Check your transformer. You can either ohm it out or just check for voltage. You have a "high" voltage side and a "low voltage" side of the transformer. The "high" voltage side will go to the power (120 volt) that comes into the furnace. This would probably be the side that would burn out during an elec. storm. To ohm the transformer: (This will be your best way to check)

1) shut off power to the furnace
2) pull the two wires loose that go to the "high voltage side"
3) put the leads from your ohm meter to each wire that goes to the transformer, and you should get some kind of reading. If not the "high voltage" side of the transformer is burnt out

You can follow those three steps to the "low voltage side as well, just remember where you take any wires off.

Be sure you have the power turned OFF. Good luck, hope this helps you.

Apr 18, 2011 | Heating & Cooling

1 Answer


I have a similar model, and I had it completely apart a few months ago. There is a power supply that provides power to the motherboard, the light engine, and the sound system, and the lamp (all seperate power taps). It sounds like perhaps someting in the power supply connection to the sound portion of the system is malfunctioning, or that the sound boards themselves have failed.

My unit's problem was the power supplied to the high voltage lamp, a trace on the circuit board was broken, and it was unable to source enough current to reliably start the lamp.

Be careful around the power supply, the capacitors store a significant charge, and they can very easily shock you. I would not recommend disassembly of the unit or an attempt to repair unless you have experience with high voltage electronics. Any dissassembly will void your warranty as well.

Sep 24, 2010 | Mitsubishi WS-65613 65" Rear Projection...

1 Answer

1990 Voyager. Need code definitions from check engine light. Codes retrieved by turning key on 4 times and counting check engine light flashes. codes were: 12 41 25 55.

here you go hope it helps,dont forget to vote on answer thanks
88–95 3.0L (Except Monaco, Premier & Stealth),
3.3L, 3.5L & 3.8L Engines
Engine Has Not Been Cranked Since Battery Was Disconnected{4}
No Crank Sensor Signal During Engine Cranking{3}
Memory Standby Power Recently Lost
MAP Sensor Pneumatic Circuit
MAP Sensor Electrical Circuit
Vehicle/Distance Sensor Circuit
Loss Of Battery Voltage Sense
Engine Running Too Cool
Problem In Oxygen Feedback Circuit
Coolant Temperature Sensor Circuit
Charge Temperature Sensor Circuit
Throttle Position Sensor Circuit
AIS Motor Drive Circuit
Injector Current Limit Not Achieved
Injector Driver Interface Circuit{1}
Injector Control Circuit{2}
Purge Solenoid Circuit
EGR Diagnostics
A/C Cutout Relay Circuit Or A/C Clutch Relay Circuit
Fault In Speed Control Solenoid Driver Circuit
Fault In Fan Relay Circuit
Part Throttle Unlock Solenoid Driver Circuit
Fault In Charging System Or No Field Current
Fault In ASD Relay Driver Circuit
In Ignition Coil Control Circuits
Lose Of FJ2 To Logic Board
Battery Voltage Is Too High
Battery Voltage Is Too Low
Lean Condition Is Indicated
Rich Condition Is Indicated
Internal Problem In Module
Fault In Distributor High Data Rate Pickup Circuit{1}
No Sync Pickup Signal{2}
End Of Message
Unsuccessful Attempt To Update EMR Mileage
Fault Error{1}
Controller Failure EEPROM Write Denied{2}
Manifold Tuning Valve
CCD Bus System
Speed Control Relay Circuit

{1}—1988–91 models.
{2}—1992–95 models.
{3}—1990–95 models.
If you need more just ask Thanks Db

Aug 18, 2010 | 1990 Plymouth Voyager

1 Answer

Light doesn't come on, does not purify the runs

If the little orange neon light no longer comes on, it is a problem with the high voltage board and transformer. The board sits on top between the plates and the fan.

In my instance, the board had become corroded and shorted the terminals of the voltage regulator located on the board. Also, the ground strap around the ferrite core of the high voltage transformer had become corroded an needed replacement. Also, check the circuit paths from the nearest components to the Voltage Regulator pads. Mine blew one of the circuit traces.

All in all, I replaced the Voltage Regulator, Mouser P/N: 595-UA78L12ACLPE3, Transistor P/N: 512-2N4403BU, Timer IC P/N: 595-NE555P.

The voltage regulator feeds the latter two, as well as the high voltage transformer, I replaced those components as a precautionary measure.

The terminals do get corroded, so check those as well. There are no terminals on the high voltage board other than on top of the proprietary potted black box that feeds the target and neon light. Be careful with the terminal on that box because it breaks easy once corroded. As mine did.

Those components fixed my problem with the high voltage board and no neon light.

Hope this helps, let me know if you have any other questions.

Sep 19, 2009 | Ecoquest Flair Air Purifier

2 Answers

Ilo 32 inch LCD wont turn on

power supply bad inside of tv

Aug 28, 2009 | iLO 2600 Television

2 Answers

Hello only on screen

On the power supply board I replaced CAP C226 as per another poster and the problem is solved. It is a 470 uF, 35 VDC capacitor. Bought one at Radio Shack for <$1.50 USD. Radio Shack part number is: 272.1030.

Jul 19, 2009 | RCA DRC8335

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