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Modelo - Chassis KP53XBR45
Pesquisa: KP53XBR45 Enviar Dica Resolvida
Resultados 18
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KP53XBR45 RA1 | shut down | Unit had two CRT's Red and Blue leaked on the original ""E"" board prompting their replacement. After changing the CRT's and the ""E"" board it was discovered the set had a symptom of immediate shut down. "" | When checking IC901(1&13) and IC903(13) we had no positive voltages that would cause a high voltage protect shut down. At no time did we ever get high voltage or Horizontal drive, for the High voltage output, Q801. However Q505, the horizontal driver for the horizontal output always had drive to it. When the first technician replaced the original circuit board it was discovered that he did not transfer the jumpers on CN804. There must be three jumpers on this connector otherwise the set will never get high voltage. CN804(1&2), CN804(3&4), CN804(5&6). Unit needs these three jumpers to route the 2 ABL circuits, .Horizontal drive pulse. Replacing these jumpers restored | Muller |
| Sony | KP53XBR45 RA1 | SCREEN | Sony KP53XBR45 Unit has a streak across the top of the screen Appears like the unit has a defective screen, or a scratch between the Lenticular and fresnel lens. Tech calling in for an authorization for screen replacement. | The defect as the tech explains showed up as a straight horizontal line at the top of the screen. It was a discoloration toward the color yellow when White is displayed. Also on the lower corner was a dark circular pattern that did not match the curvature of the Fresnel lens. I instructed the tech to inspect the entire optical light path for any defects. Tech reported back to me the mirror had a smear completely across the surface area. Possibly caused by a previous cleaning with a cleaning rag that has some oil based contaminate. Gently cleaning the mirror corrected the fault. | Muller |
| Sony | KP53XBR45 RA1 | NO TURN ON | Sony KP53XBR45 unit is not turning on. | F601 & f602 are open. Factory upgrade. Replace C815, C897, 858, & 889 from a 1000mfd @ 35 vdc to a 470 md @ | Muller |
| Sony | KP53XBR45 RA1 | no raster | KP53XBR45 serial # 9017298 Unit has no raster. Led in front is flashing. Unit does have High voltage and sound. There is an IK pulse on the cathode of each CRT but it is too high, over 90 volts PP. The G2 voltage is too low. | Checking the G2 voltage at each CRT it was discovered it was only 82 volts on all tubes. The G2 wires to each tube were disconnected and measured the free end and it was still only 84 volts. The output from the flyback T801( MV) {supply voltage for the Screen/Focus block was 12,000 volts}. This is normal. Disconnecting the (G2) wire that leads over to CN882(1) allows the picture to come on but the G2 supply only increases by a few volts. It has been determined by these tests that the Focus/Screen High Voltage resistors | Muller |
| Sony | KP53XBR45 RA1 | LINE PARING | Sony KP53XBR45 RA1 Chassis. Unit has line paring. ?This condition is when the vertical scan rated changes an possibly reverse directions quickly then return to normal again | I had tech freeze the jungle chip which stopped the symptom. Heating the chip aggravated the symptom. This is caused by the Jungle chip | Muller |
| Sony | KP53XBR45 RA1 | KEYBOARD | Sony KP53XBR45 When the Power is turned off at the set the TV will turn back on again | Install a de-bouncing capacitor 2.2 mfd@ 16vdc) between the Low and High side of the Power on/off switch. The front screen will have to be removed to accomplish this. | Muller |
| Sony | KP53XBR45 RA1 | HORIZONTAL | KV53XBR45 unit has horizontal overscan | Tech needs to look at the vertical pin correction signal on the ""A"" board CN304(5). This signal must be about 1 volts peak to peak of a vertical parabolic waveform riding on a 2.7 volts DC level. If the voltage is significantly over three volts the Pincushion ciircuit will saturate and damage will occur. If the voltage is too high, too low, or missing the Parabolic wave the Jungle IC should be suspect. "" | Muller |
| Sony | KP53XBR45 RA1 | dead | KP53XBR45 serial number 9017123 Unit is dead. The set went up in smoke. Customer unplugged the set and called for service. | Unit has burned A board on the corner 1E coordinated. This circuit is for the dynamic focus output and the 3 horizontal deflection yoke drives. The corner is completely burned away from the A board. Tech will need a replacement AA board A1297-540-A. | Muller |
| Sony | KP53XBR45 RA1 | CRT | KP53XBR45 serial 9032096. Unit has burned CRT's again. CRT were replaced in October of 1998 because of a bar burned across the face plate. Now the same bar is burned across the face plates of green and blue CRT's. This is caused by the stock market channel and or CNBC banner at the bottom of the screen | This customer was warned last year this would be a 1 time replacement for this symptom. They were warned that continuous display of a stationary image will burn any CRT especially a projection television. | Muller |
| Sony | KP53XBR45 RA1 | CRT | KP53XBR45.Serial# 9015424 Unit had two CRT's Red and Blue leaked on the original ""E"" board prompting their replacement. After changing the CRT's and the ""E"" board it was discovered the set had a symptom of immediate shut down. "" | When checking IC901(1&13) and IC903(13) we had no positive voltages that would cause a high voltage protect shut down. At no time did we ever get high voltage or Horizontal drive, for the High voltage output, Q801. However Q505, the horizontal driver for the horizontal output always had drive to it. When the first technician replaced the original circuit board it was discovered that he did not transfer the jumpers on CN804. There must be three jumpers on this connector otherwise the set will never get high voltage. CN804(1&2), CN804(3&4), CN804(5&6). Unit needs these three jumpers to route the 2 ABL circuits, .Horizontal drive pulse. Replacing these jumpers restored | Muller |
| Sony | KP53XBR45 RA1 | CRT | KP53XBR45 serial# 9012936 Blue CRT leaked dropped over E-board | Unit needs Blue CRT and attempt to clean the ""E"" board "" | Muller |
| Sony | KP53XBR45 RA1 | control panel | Sony KP61XBR48 When the power button is pushed in the set will shut off then turn back on again | The power on off switch is pushed the logic low that gets sent to the CPU is not staying low. It get corrupted with a bounce caused by the contact in the Power on -off switch. This fix is to install a 2.2 mfd capacitor across the on-off switch to de-bounce the contacts. | Muller |
| Sony | KP53XBR45 RA1 | audio | KP53XBR45 serial # Unit has history of the ""GB"" board shorting out the switching transistors in the switcher supply. Q1201, & Q1202 short with R1206 opening. By simply replacing the transistors and C1210, C1211, C1212, and C1213 the power supply will run for 3 to 5 weeks then short the switching transistors again. The customer explained that they lost audio while the set was playing. The sound quality was normal up until the event that took place to short the switching transistors. This has happened 2 times. Tech is wondering if there are any other case histories regarding this symptom. "" | Suggest the tech look at replacing the following components D1204, D1205, D1209, D1208, D1206, D1207, D1210, & D1211. These are the limiting diodes and have a generic # 1SS133T. In addition there are 2 zener diodes in the secondary of this power supply that are used as protection They are D1213, and D1214. They will act like a crowbar across the + or - 18 volt source in the event the voltage increases beyond the avalanche limits of the zener diodes. In addition to the components I would suggest the tech replace IC1201 | Muller |
| Sony | KP53XBR45 RA1 | arcing | KP53XBR45 serial 9012904 Unit Has an arcing Red and green CRT then shuts down. Tapping on the neck of the tube aggravates the symptom | Bulletin # 281R1 need to be preformed on this chassis. It will protect the CRT driver board from arc over damage as a result of an arcing CRT. It is suggested to replace both CRT's and perform upgrade on all 3 CRT driver boards. | Muller |
| Sony | KP53XBR45 AP | control panel | KP53XBR35 Unit has symptom of when the volume up is activated the channel down is activated instead. All other buttons act normally on this analog string. Tech did not check the other analog string which is where the ""Menu, +, -, and display key. "" | There are two identical analog keyboard voltage dividers attached to the KSENS0 & KSENS1 lines to the microprocessor. The should act identical in operation. The switches that acts as the volume up was swapped with the Menu key switch. The volume switch began working correctly and the menu stopped. The switch was replaced and now it works correctly. | Muller |