IRFA datasheet, IRFA circuit, IRFA data sheet: FAIRCHILD – Advanced Power MOSFET,alldatasheet, datasheet, Datasheet search site for Electronic. IRFA Advanced Power MOSFET FEATURES. Avalanche Rugged Technology Rugged Gate Oxide Technology Lower Input Capacitance Improved Gate. Details, datasheet, quote on part number: IRF IRFA Advanced Power MOSFET. IRFB V N-channel B-FET / Substitute of IRF & IRFA.
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I removed the output transistor in an attempt to test for signal on the base drive but the monitor instantly shuts down with the transistor removed. This is confirmed by either HV Voltage probe or by hearing the crackle. Sometimes the diodes and the FET aren’t totally shorted, but have high leakage in the reverse direction. One curious correlation is that of the seven of this model that we have, these three are also the only ones without screen savers running.
If blue is present there, then the color gain data for the blue in the Eeprom has probably been set to zero, and the Eeprom data is corrupted. I need the value of R and the cause of it burning.
Pull out main board and disassemble main board from all the metal frames. What makes the unit adopt a standby mode? IBM monitor Sept ‘ Now the monitor powers up, but no HV even after replacing d d was OK. Gateway CrystalScan LE monitor in for repair. The first thing to do is check your high voltage while changing the raster from black to white. Appears to be slightly dim as well. Check if R is open. Check for bad solder and cracks, especially at the horizontal driver transistor and transformer, and check the ESR of any electrolytics in the drive circuit.
The worst offender is C, but also C, which tend to leak fluid out their bottoms onto the board underneath, corroding traces, and conducting high voltages to vulnerable components. Dell DD-LS monitor powers up, no high voltage.
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Is it the FBT that is faulty? The vertical adjustment is okay, the whole adjustment is being done by the same console. If the screen does not brighten up to normal you probably have a bad CRT. Test deflection yoke and high voltage transformer.
Both are new and the company that sold them no longer exists. Before total failure it was having trouble displaying the first couple of characters on left hand side of the raster. The companies who manufacture these items usually degauss them before shipping.
Also check the three megohm resistors in parallel with CC Also, it is wise to desolder the bottom lead of heatsinked damper D, and check that its lead extends all the way through the board.
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You might check it for internal shorts, or for faulty power rails pins 1, 8, 13 ; also check for bad solder, and check resistor R 1 ohm. Filaments are glowing in rear of CRT. If so, where is the IC located, and should any other components be replaced along with it? This appears to be a design problem. The part number on the small transformer IS the part number. When powered up again the fuse and trany went. If yes, try glueing on a grounded copper datashee to it for a heatsink.
Remove bottom metal chassis and main board metal frame. Replacement HOT shorted after two days usage. It is just raster no video. I have a customer in Lake Orion, Michigan who has a steel beam in his residence magnetized.
I magnified, poked, bent, just about everything and I cannot find it. If low try replacing caps orf634a C mf 16V. All voltages at the CRT remain unaltered ie. No adjustments on the crt to set the gray scale.
Signal for horizontal output is Vpp and always work good. If it is a ief634a clean unit, check the Connector and Wiring from the Vertical circuit to the Main Yoke. Poor solder connections on the vertical ic causes this problem. They have a complete line of replacement cables. Gateway Vivitron 17″ monitor that invariably goes into power save mode on startup.
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The problem was very simple, but not obvious at first. IBM monitor, manuf. With no model number provided, one cannot be specific, but certain Goldstar 14″ chassis are known for getting bad FBT’s with such symptoms. Sun GDME20 monitor is too bright, only can see some line on screen.
When replaced, it burns out in 1 second. However, when powering down video is momentarily present. The only other side effect, is a little ghosting to the right if high contrast edges. Besides C and the three V capacitors you mentioned, dtaasheet check C, and always check the 2KV ceramic disk cap off the collector of Q, these are common failures.
I cannot find any defective components in this part of the power unit. It seems Q is likely doing its job.