ZENITH TELEVISION REPAIR AND TROUBLESHOOTING TIPS

You can find out here if you have the same problems or symptoms of your televison.
Note: These troubleshooting tips are not guarantee that you can fix your unit right away and won’t solve all the component problems you may run into, but they should solve a good number of them. Servicetron.com is not responsible for any damage as a result of following any of this advice.






ZENITH TV REPAIR TIPS

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  • Zenith sj1325w tv a high pitched squeal when plugged it has a high pitched squeal when plugged it. The h.o.t. Appears to be ok, but not sure. Does this h.o.t. Have the damper built suspect the flyback.order the whole module but be sure the crt is good first. Many of these sets have defective crts.
  • Zenith srv1304s no power the standby voltage @ 5 volts to ic. On high voltage board found 1 side open on t571. Remember +26vcc must be present to vertical ic or micro will shut down the set. Defective t571
  • zenith z25x22s8 picture reddish defective transistor q2005 type 2n3906
  • zenith z27x22d z27x22d 72145467024. Unit has an arcing in the neck of the crt. Shorted the video output drivers unit will need the crt a68agd02x note: it has been discovered the cause of the arcing has been attributed to the dag coating coming off inside the picture tube. This coating is conductive and if it migrates to the neck off the tube it will cause arcing back through the low level video drive circuits.
  • Zenith z27x22d i had a dark screen only when i use the tuner input, no screen or speaker noise of any kind. Everything else in the tv worked just fine like input from the a/v jacks, osd, menu etc... Tuner voltages were fine too. I suspected the tuner and replaced it...big mistake! That did not solve the problem. So i went back to basics and started taking voltage     to my surprise, i found that video processing icx2200 marked ta1242n had very low voltages all over its pins! I checked the b+ to the ic and it was zero! That basically solved the problem. I traced that b+ back and found c1233 470uf/10v leaky. I replaced it with a 470uf/16v (i thought a 10v cap is too low to filter a 9v supply). However that did not bring the voltage back. I tested l1208 which is connected to c1233 and to the 9v regulator ic3441 and it was open! I forgot to mention that my first test was actually on that 9v regulator which was fine. I bridged l1208 with a very low value resistor just for testing and viola!!
  • Zenith z27x22d     z27x22d unit has excessive green screen with retrace lines. Tech calling in for crt approval.     I had tech check the q5102 and compare reading to the other two transistors q5101, q5103. Q5102 has a f/b reading on 0.1 on a fluke 77 meter in the diode mode. This reading indicates the transistor is leaky and does not have the typical 0.6xx f/b reading like the other transistors. Tech replaced the q5102 but still had green screen with retrace lines. After checking the three rgb drive signals the tech found the r & b drives at connector 2c5(1&3) had 2.2 volts on them where as 2c5 (2) had 3.7 vdc. Measuring the rgb output pins of icx2200 (19, 20, 21) had all the same voltages on them. Each of these test points should be the same voltage if an all snow pix are displayed. Unit also had a open q2205
  • zenith z27x22d     dead set, no relay click. Checking rx3407= 471w, rx3408= 221/ 2w, qx3401= 1211348 all defective     suggest also replacing cx3413(22/63v), cx3416(100/25v), rx3404(180k1/ 2w) along with the regulator str53041
  • zenith z27x22d unit has a symptom of a pulsing picture. Unit has an intermittent symptom of loosing horizontal sweep then the picture goes dark then on again. Unit will not stay on long enough for 1 complete field to be displayed. Tech monitors the horizontal output b+ and finds it fluctuated from 130 volts. Horizontal driver     the power supply is stable. Unit has had a defective cpu icx6000.
  • Zenith z36x31d unit has no life at all. We have had several of these all having no power / no click from the on/off relay or the degaussing relay     using str53041 regulator always replace: cx3413 = 22mf 63v, cx3416 = 100mf, 25v, rx3404 180k (use 1/2w). Also check: rx3407 = 47 ohm, 1w, rx3408 22 ohm, 1/2w qx3401 1211348 (use ecg184 or one of many other transistors with similar spec's listed in the ecg guide under to220 and to220j case styles 4 only (a 1amp rating is required). If that doesn't does it replace icx3431 str53041?
  • Zenith z36x31d zenith sy2518rk. Unit was dead. Tech replace the main module, a 91584 and now has no audio     this module will not allow the tech to change the level settings to level (2) when the factory mode is turned on and the jumper is on 4g3 pins 3 and 4. This chassis requires the module to be set to level (2)
  • zenith sy2518rk. Unit was dead. Tech replace the main module, a 91584 and now has no audio     this module will not allow the tech to change the level settings to level (2) when the factory mode is turned on and the jumper is on 4g3 pins 3 and 4. This chassis requires the module to be set to level (2)
  • zenith z36x31d unit will not turn off, unit is always on. A 91813n was replaced for a dead set symptom.     Cannot set the level adjustment to level 2. Unit only has level 0 and 1. This may only be a minor problem. I had tech go into the tech menu and set the factory mode to 1. And look at the parameter of a.c on/off feature. It was set to "0". This feature needs to be set at "1". It is used only when the television is switched on and off by an external ac switched source
  • zenith z48z83d unit will not turn. Tech replaced power supply/deflection and signal modules but still cannot get the set to turn on     was it happening when the power is turned on is the set is trying to turn on, it has b+ and drive at the horizontal output transistor but the power supply is going into over current shut down. Suggest the tech remove the high voltage lead from the hv block ad stick the high voltage end of it in a glass coke bottle or equivalent to prevent it from arcing to strategic areas on the chassis. We found that high voltage returned. Unit has a defective hv block. A1719605   
  • zenith z60z83d 78116351245 units was way out of convergence. Replacing the convergence output & convergence power supply module did not correct the symptom. Instead r4163 & r4160 burned open again.r4163 and r4160 are burned. These resistors are in the b+ supply for the convergence output supply. An over current situation must have occurred in order to burn these devices out. Since the convergence output board and convergence power supply are new, and the new resistors are burning up the only thing that makes sense is that one of the sub deflection yokes (convergence yokes) may be damaged causing this over current situation to exist. Suggest the tech measure the dc resistance of all the windings in the sub deflection circuit. All like windings should measure the same exact resistance. All vertical windings should measure the same and so should the horizontal.
  • Zenith z60z83d unit has no chroma in the pip mode. Unit functioned fine up until the signal module was replaced. Now after 1 year the customer noticed the pip has no chroma. Customer never used before this time.     Tech needs to order the pip module.
  • Zb2797p     no audio or video, normal raster also you can view the customer's menu but not the service menu replace ic3 on the zcu bd

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