Dicas Reparação SONY
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 | KP53S35 RA1 | CHROMA | Sony KP53S35 . Unit has poor chroma of the main picture. | It appears like a loss of chroma phase lock of the 3.58 internal oscillator. The frequency is unstable. Recommend tech resolder the connections on X301, C305, C310 and R322 in the AFCFL circuit of the Jungle IC. This is IC301 near pins 1, 2, and 3.. Unit had broken connection on R322. | 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 | KP61XBR45 RA1 | AUDIO | KP61XBR45. unit has no audio.. When an external amp is connected to the Line outputs the set will produce line level audio to the external amp. | Tech is not getting B+ to any of the Audio output IC's on the ""K"" board. Apparently the ""GB"" board is not providing the B+ necessary for the audio to turn on. Tech needs to check the condition of the 4 fusible resistors in the +18 & -18 volt supply. R1217, R1273, R1297, R1295 "" | Muller |
| Sony | KP61XBR48 RA1 | AUDIO | Sony KP61XBR48 Distorted audio only when using the Surround mode or any high end audio feature. The sound is a raspy approx. 100 ~ 150 Hz buzz. | Call tech back regarding the IC or circuit involved with this expanded audio features. Unit in IC304( 8-759-248-74) Mixer IC305 (8-759-341-23) all located in the AA board complete board is A-1297-622-A | 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 | KP46XBR25 Projectio n | CONVERGENCE | Unit has an intermittent ""Out of convergence"" picture. But now the unit is completely dead. "" | Tech needs to replace the Q603, Q614, R604, D605, both convergence IC's. D605 is shorted. | Muller |
| Sony | KV2084 P3 | SYSTEM CONTROL | Sony KV2084 Will not memorize any channels. Tech ordered the CPU and Memory IC. | I asked tech to check the negative supply voltage to IC103 Memory IC on 10, it should be -29 VDC before replacing the CPU and Memory IC. CPU was not needed. Verified the presence of the supply voltages at the memory chip. The memory chip was defective. | Muller |
| Sony | KV27TS27 LN-1 | red raster | Sony KV27TS27 LN-1 chassis predominately red picture. | When shorting out the RGB cathodes on the CRT the set will get a perfect black and white picture but shorting out the RGB inputs on the CRT board the set is missing green. Trouble is a defective green output transistor. | Muller |
| Sony | KV32XBR50 LN1 | horizontal | KV32XBR50 Unit has sever horizontal overscan. Measuring Q505(C ) the voltage was near ""0"" volts. Tech changed Q501 but the transistor shorted in less than 5 seconds. "" | IT was discovered that the Q505 was shorting collector to emitter. Also R571 was also showing signs of overheating. It was suggested that L501 & R571 be replace with a new Q505. The set now runs correctly. | Muller |
| Sony | KV32TS27 LN1 | audio | KV32TS27 7039676 Unit has an intermittent squeal in the audio when trine to receive a stereo broadcast. | Tech needs to replace the Audio IC SBX1627-11 | Muller |
| Sony | KV32XBR36 FN | vertical | KV32XBR36 Unit has a slow compressing and decompressing of the vertical sweep. | Q605 was not soldered well | Muller |
| Sony | KV27XBR10 FN | tuning | Unit has AFT drifting as soon as the channel is addressed. It never stops the AFT search. | Unit needs to have the IF/Demodulator module removed from it's shielded compartment and resolder all the adjustable tuning transformers. The AFC coil/transformer has ring fractures around the pins that protrude through the | Muller |
| Sony | KV32XBR76 FN | POOR COLOR | KV32XBR76. Unit has poor color registration but color bars appear near normal. But when cross hair pattern is put up on the screen there are no blue vertical line. There are red and green vertical line | This symptom is a result of a high frequency loss. The ability for the amplifiers in the B drive to turn on an off rapidly is a direct result of how high the bandwidth is. In this case the three outputs of the Jungle IC301(20,22,&23) had the typical signal when viewed on an oscilloscope. All three outputs had the same vertical spike in the center of the horizontal line on the oscilloscope scope. Waveform showing the cross hair | Muller |
| Sony | KV32XBR76 FN | no high voltage | KV32XBR76 Unit will not turn on No high voltage. Measuring the condition of the D1409 is shorted. | The problem is caused by D1409 on the A Board shorting. Problem caused by an intermittent B+ regulator on the G board, IC651, 1-809-524-11. Replacement resolves problem. We have seen a number of these units lately with D1409 shorted. Often it is simply ring cracks on IC651 causing the problem. This unit did have a loose solder connection on IC651(1) but it did not drop the voltage down enough across D1409. The voltage was always 36.6 volts across a 36 volt | Muller |